Provided by: impressive_0.10.3+svn61-1_all 
NAME
Impressive - presentation tool with eye candy
SYNOPSIS
impressive [OPTIONS...] FILES...
DESCRIPTION
Impressive is a simple presentation program that displays slideshows of image files (JPEG,
PNG, TIFF and BMP) or PDF documents. Rendering is done via OpenGL, which allows for some
"eye candy" effects.
OPTIONS
-a <seconds> or --auto <seconds>
Automatically advance to the next page after the given number of seconds. Together
with the -w option (described below), this can be used to create automatic
slideshows.
-A <X>:<Y> or --aspect <X>:<Y>
Specifies the display aspect ratio. Normally, Impressive assumes that the pixel
aspect ratio is 1:1 (square pixels), regardless of the display resolution that has
been set up. If a resolution has been selected that doesn't match the display's
aspect ratio, the screen will be distorted. To overcome this, this option may be
used to manually specify the display aspect ratio, e.g. "-A 16:9". Note that this
option has no effect if Xpdf is used for rendering.
-b or --noback
Disabled background rendering. By default, Impressive will pre-render all pages in
a separate background thread while the presentation runs. If this option is
specified, it will instead render all pages immediately on startup. This option has
no effect if caching is disabled (--cache none, see below).
-B <ms> or --boxfade <ms>
Sets the duration (in milliseconds) of the highlight box fade-in/fade-out
animation. Default value: 100 ms.
-c <mode> or --cache <mode>
Specifies the page cache mode to use. Valid options are:
none
Disables page caching altogether, only the current and the following page
will be kept in RAM. Jumping between pages will be very slow, because
Impressive will need to render the requested pages on the fly. In addition,
the overview page won't be complete until every page has been shown at least
once.
memory
Caches all page images in memory. This is the fastest method, but it
requires very large amounts of memory (about 3 MiB per page at 1024x768
resolution).
disk
Like above, but uses a temporary file rather than memory for storage. This
is the default.
persistent
Uses a permanent cache file for caching. This file will not be deleted when
Impressive quits and will be reused on subsequent invocations. The default
name for the cache file is derived like the names for Info Scripts (see
below for an explanation), but with a .cache file name extension instead of
.info. This method is a little bit slower than disk mode, but the time span
until the overview page is fully populated will be significantly decreased
if Impressive is ran again with the same input files and options.
The mode name may be abbreviated at will, down to one character. Thus, --cache
persistent, -c persist and even -cp are all synonyms.
-C <filename>[:<X>,<Y>] or --cursor <filename>[:<X>,<Y>]
This option can be used to specify the path to an image file (typically a
transparent .png) that shall be used as the mouse cursor instead of the default
one. Optionally, the hotspot may be specified (this is the position inside the
cursor image where the real mouse position is located). Example: --cursor
mycursor.png:2,4
--clock
If this option is enabled, the current time will be shown instead of the elapsed
time if time display is activated with the T key. Compatible with the -M option.
-d <time> or --duration <time>
Specifies the expected run time of the presentation. The time parameter can be
either a number of seconds or a human-readable time like 1:23 (1 minute and 23
seconds), 4:56h (4 hours and 56 minutes), 3m45s (3 minutes and 45 seconds), 5m (5
minutes) or 1:23:45 (1 hour, 23 minutes and 45 seconds).
If an expected duration is specified, Impressive will show a semi-transparent green
progress bar at the lower edge of the screen, indicating how much time has already
passed. If the time is up, the bar will occupy the whole edge and fade to yellow
(at 125% of the expected time) to red (at 150% or more).
-D <ms> or --mousedelay <ms>
Sets the time (in milliseconds) the mouse cursor is shown in fullscreen mode if it
is not moved. Default value: 3000 ms.
-e or --noext
OpenGL normally only supports textures with power-of-two dimensions. This means
that for a 1024x768 screen, the actual texture size will be 1024x1024, for
1600x1200 it will even be 2048x2048. To overcome this limit and save texture
memory, Impressive will automatically use the OpenGL extensions
GL_ARB_texture_rectangle (available on most graphics cards) or
GL_ARB_texture_non_power_of_two (available on modern graphics cards with current
drivers). If these cause any trouble, the -e option may be used to prevent
Impressive from using the problematic extensions.
-f or --fullscreen
Toggles fullscreen mode. By default, fullscreen mode is activated, and can be
deactivated using this switch.
-F <file> or --font <file>
Impressive uses some kind of text OSD to overlay the current page number and title
(if available) on the overview page. This option can be used to specify a TrueType
font file (.ttf) to use for the OSD. If the path specified doesn't directly point
to a useable font file, Impressive will try to search the system font directories.
It assumes that all fonts are stored below /usr/share/fonts, /usr/local/share/fonts
or /usr/X11R6/lib/X11/fonts/TTF for this purpose (the latter one is useful for Mac
OS X systems specifically). If this option is not specified, any of DejaVuSans.ttf
or Vera.ttf (the typical file name of Bitstream Vera Sans) will be used as a
default.
-g <width>x<height> or --geometry <width>x<height>
Sets the screen size or resolution Impressive shall use (in pixels). If xrandr is
installed, the default screen size for fullscreen mode is the current screen
resolution; on other platforms, Impressive uses the highest resolution available to
the graphics system. If a standard resolution cannot be determined, the default is
1024x768 pixels. Note that this option is not the standard X "geometry" option and
does therefore not support window positioning (e.g. -g 800x600+0-0 will not work!).
-G <gamma>[:<blacklevel>] or --gamma <gamma>[:<blacklevel>]
Sets up the startup gamma and (optional) black level value. The black level is the
original image's intensity level (0...254) that is to be mapped to black in
Impressive's output. Note that gamma and black level adjustments may be unavailable
or constrained on some systems.
-h or --help
If this option is specified, Impressive writes a short command line help screen to
standard output and does not start a presentation.
-H or --half-screen
This option makes Impressive show the overview page and OSD elements on the right
half of the screen only. The overview page will only show the left half of the
slides as previews. Using a multi-monitor setup with a wide virtual screen and
specially crafted slides (e.g. those that can be generated with LaTeX's beamer
class), this makes it possible to have presenter's notes on the second screen.
Note that transitions and animations are still operating on the whole screen,
making some of them (like PagePeel) look ugly. Impressive also disables the
overview zoom animation in half-screen mode; it can be re-enabled by explicitly
setting it to another value with a later command line option (--zoomtime).
Another limitation is that the allocation of the screen halves (slides left,
overview right) is fixed.
-i <page> or --initialpage <page>
Specifies the page number to start with. The default value is 1 (start with the
first page). If another value is specified, the page shown by Impressive right
after initialization is not the first one of the PDF or image list. Additionally,
pre-rendering (if enabled) will also start at the specified page.
-I <filename> or --script <filename>
Overrides automatic derivation of the info script filename and specifies a script
file directly.
-l or --listtrans
If this option is specified, Impressive writes a list of all available transition
classes to standard output and does not start a presentation. Transitions that are
enabled by default are marked with a star (*) left of the class name.
-L <spec> or --layout <spec>
Specified the OSD layout. Read below for an explanation of this option
-M or --minutes
If this option is set, Impressive will show the on-screen timer (activated with the
[T] key) only with 1 minute resolution. By default, it will show a timer with 1
second resolution.
--nologo
This option disables the Impressive logo and version number display. Instead, the
loading screen will be just black or, if background rendering is disabled, only the
progress bar will be visible.
--noclicks
If this option is enabled, switching to the previous or next page with the left and
right mouse buttons is deactivated. The keyboard shortcuts are unaffected from
this.
-o <directory> or --output <directory>
Do not display the presentation, but render it into a series of PNG image files
inside the specified directory. The images will be generated in the current
resolution as specified by the -g option. This option is useful if you're going to
give a presentation on a foreigh PC with an old, broken or otherwise problematic
Xpdf or GhostScript installation: By generating images of the PDF pages you can
ensure that no rendering bugs will happen on the target system.
-O <mode> or --autooverview <mode>
Enables or disables automatic derivation of whether a page shall or shall not be
shown on the overview page. This feature is based on the fact that some LaTeX
presentation packages tag all pages with a title (that can be read by Impressive
with the help of pdftk), except those that contain multiple reveal steps.
The following modes are available:
off
Disables automatic overview mode. All pages will be shown on the overview
page by default. This is also the default setting.
first
All pages with a PDF title will be shown on the overview page. The purpose
is to show the initial state of multi-step slides on the overview page.
last
All pages before a page with a PDF title will be shown on the overview page.
The purpose is to show the final state of multi-step slides on the overview
page.
Again, the mode may be abbreviated arbitrarily, down to one character, just like
with the -c option above..
-p <start>-<end> or --pages <start>-<end>
Using this option, the range of the page displayed can be narrowed down. The
presentation will start at the first page in the range. All pages outside of the
range will not be shown on the overview page and will not be cached. However, they
can be entered manually when cycling through the presentation. Due to the fact that
these pages are uncached, preparation of the display will take considerably longer.
-P <path> or --gspath <path>
This option can be used to override the Xpdf / GhostScript path autodetection. The
full path to the executable of either GhostScript (gs or gs.exe) or Xpdf's pdftoppm
utility must be specified.
-q or --page-progress
If this option is enabled, Impressive will show a light-blue semi-transparent
progress bar at the lower edge of the screen that shows the position inside the
presentation, i.e. the relation between the current page number and the total
number of pages. Note that this progress bar will not be shown if the duration
progress bar (-d option) is also enabled.
-Q or --autoquit
If this option is specified, Impressive quits automatically when trying to navigate
to the page after the last page or the page before the first page.
This option does not have any effect if --wrap is used.
-r <n> or --rotate <n>
Display all pages rotated by nx90 degrees clockwise. Try -r 1 or -r 3 if you run
into problems with PDFs generated by LaTeX on some Xpdf or GhostScript versions.
-R <X>x<Y> or --meshres <X>x<Y>
Most effects subdivide the visible screen into a mesh of rectangular or quadratic
pieces, each with its own coordinates and alpha blend values. Using this parameter,
the resolution of the subdivision mesh can be defined. The default value is 48x36.
On slow machines, lower values like 24x18 or 12x9 can heavily speed up transition
rendering at the cost of visual quality. On the other hand, higher values like
64x48 or 96x72 improve quality, but use much more CPU cycles.
-s or --scale (image input only)
If a directory with image files is used as input, Impressive will scale down images
that are too big for the screen. But by default, it will not scale up smaller
images to fit the screen; it will leave a black border instead. This option
overrides this setting and enables upscaling of smaller images.
-s or --supersample (PDF input only)
This switch enables antialiasing by 4x supersampling instead of the normal
multisampling method used by Xpdf or GhostScript. While this usually degrades both
visual quality and performance, it may be necessary for circumventing white strips
or moire-like patterns in gradients.
-S <pixels> or --fontsize <pixels>
This option sets the size, in pixels, of the OSD font. The default value is 14.
--spot-radius <pixels>
This option sets the initial radius of the spotlight, in pixels. The default value
is 64.
-t <ms> or --transition <trans1[,trans2...]>
Using this switch, the set of transitions Impressive will randomly draw at page
changes can be specified. If only one transition class is specified, this class
will be used for all pages that do not have another transition explicitly assigned
in their page properties. Multiple transitions have to be separated by commas; they
will be used in random order. The -l option can be used to get a list of available
transitions.
-T <ms> or --transtime <ms>
Sets the duration (in milliseconds) of page transitions. 0 (zero) disables
transitions altogether. Default value: 1000 ms.
-u <seconds> or --poll <seconds>
If this option is specified, the source file or directory will be checked for
changed regularly. If a change in the input PDF file or any of the image files in
the input image directory is detected, the page cache will be flushed and the
current page as well as the info script will be reloaded. The current page's
transition will be shown between the old and the new version of the page.
The new PDF file must have at least as much pages as the old one; also, it should
have the same aspect ratio. If the input is a directory, image files must not have
disappeared.
-V <pixels> or --overscan <pixels>
PDF files often contain tiny amounts of white borders around the edges which look
bad in screen presentations. To eliminate this problem, Impressive uses "overscan":
PDF files will not be rendered to fit the screen size exactly, but they will be
rendered a bit larger so that the (possibly broken) borders can be cropped off. The
amount of overscan, in screen pixels, can be set with this option. The default
value is 3 pixels, which should remove borders in most presentations at most common
screen resolutions without cropping the pages too much.
-w or --wrap
If this option is set, Impressive will "wrap" over to the first page after the last
page. In other words, advancing to the next page at the end of the presentation
will restart the whole presentation.
-x or --fade
This option enables a smooth fade-in effect at the start of the presentation and a
fade-out effect just before Impressive quits.
-X or --shuffle
If this option is enabled, the input files will be shuffled into random order
before starting the presentation. The individual pages of PDF input files will stay
in their original order, though, so this option is mainly useful for image
presentations.
-z <factor> or --zoom <factor>
Sets the zoom factor that is used in zoom mode. It must be an integer value of at
least 2. The default value is 2. Note that it might not be possible to get
high-quality zooming for large zoom factors due to hardware restrictions.
-Z <ms> or --zoomtime <ms>
Sets the duration (in milliseconds) of the overview page zoom-in/zoom-out effects.
Default value: 250 ms.
--cachefile <filename>
Activates persistent cache mode and specifies the name of the cache file to use.
ARGUMENTS
Following the options, the input file name(s) must be specified. Recognized file types are
PDF, JPEG, PNG, TIFF, BMP and PGM/PPM. If the name of a directory is put on the command
line, all recognized image files (no PDF files!) in this directory will be played in
alphanumeric order (case-insensitive).
In addition, Impressive can use a text file containing a list of files or directories to
show: This text file must contain at most one file name per line; every character after a
hash sign (#) is treated as a comment and will be ignored. If such a comment is put on the
same line as an image file name, it will be used as the page's title. List file names must
be prefixed with an at sign (@) on the command line, e.g. impressive @my_list_file.
Impressive will also expand wild-card characters (* and ?) if this isn't already done by
the shell, but apart from that, it will not reorder the arguments. Thus, it will show the
documents in the order specified at the command line.
LAYOUT OPTIONS
The OSD layout option (-L/--layout) accepts a string with comma-separated key=value pairs.
The following keywords are recognized:
alpha
The opacity of the OSD text, either as a floating-point value between 0 and 1 or a
percentage between 2 and 100.
margin
The distance (in pixels) of the OSD text to the screen borders.
time
The position of the timer.
title
The position of the page title in overview mode.
page
The position of the page number in overview mode.
status
The position of the status line.
The position specifications are composed by one character that indicates whether the text
shall be displayed at the top (T) or bottom (B) edge of the screen and one character that
indicates whether it shall appear on the left (L), on the right (R) or centered (C).
For example, the default OSD layout equals the following option string:
-L margin=16,alpha=1,time=TR,title=BL,page=BR,status=TL
USAGE
On startup, Impressive will display a black screen with the program logo at the center. If
caching is enabled, but background rendering is disabled, all pages of the presentation
will then be rendered once. A bar in the lower half of the screen displays the progress of
this operation. Any key (except for Q and Esc) or mouse click skips this process, with the
effect that Impressive will render the remaining pages on demand. Please note that the
overview page will not be complete until every page has been rendered at least once. In
other words, if the precaching process was skipped, placeholders will be displayed for all
pages that have not been rendered yet. By default, Impressive will build up the cache in
the background while the presentation runs. Thus, the progress bar will not appear and the
preparation will only take the amount of time required to render the first two pages of
the presentation.
After this initialization process, Impressive will switch to the first page directly and
without any transition.
CONTROLS
Q key or Esc key
Quit Impressive immediately.
LMB (left mouse button), Page Down key, Cursor Down key, Cursor Right key or Spacebar
Go to the next page (using a transition).
RMB (right mouse button), Page Up key, Cursor Up key, Cursor Left key or Backspace key
Go to the previous page (using a transition).
Home key / End key
Go directly to the first or last page of the presentation.
L key
Return to the last (most recently displayed) page. This can be used to toggle back
and forth between two pages.
F key
Toggle fullscreen mode.
Tab key or MMB (middle mouse button)
Zoom back to the overview page. While in overview mode, a page can be selected with
the mouse and activated with the left mouse button. The right or middle mouse
button or the Tab key leave overview mode without changing the current page.
LMB over a PDF hyperlink
Jump to the page referenced by the hyperlink. Two types of hyperlinks are
supported: Links that point to some other page of the same document, and URL
hyperlinks like Web links and e-mail addresses. This feature is only available if
pdftk is installed. Furthermore, xdg-open from the freedesktop.org Portland project
is required for URL links to work. Please note that the hyperlink feature will not
work properly when pages are rotated.
click&drag with LMB (left mouse button)
Create a new highlight box. While at least one highlight box is defined on the
current page, the page itself will be shown in a darker and blurry rendition. Only
the highlight boxes will be displayed in their original lightness and sharpness.
If a page with highlight boxes is left, the boxes will be saved and restored the
next time this page is shown again.
RMB (right mouse button) over a highlight box
If the right mouse button is clicked while the mouse cursor is above a highlight
box, the box will be removed. If the last box on a page is removed, the page will
turn bright and sharp again.
S key
Save the info script associated with the current presentation. The main purpose for
this is to permanently save highlight boxes or keyboard shortcuts, so they will be
restored the next time this presentation is started.
T key
Activate or deactivate the time display at the upper-right corner of the screen. If
the timer is activated while the very first page of the presentation is shown, it
activates "time tracking" mode. In this mode, a report of all pages visited with
their display duration, enter and leave times will be written to standard output.
This can be very useful when preparing presentations.
R key
Reset the presentation timer.
Return key or Enter key
Toggle spotlight mode. In this mode, the page is darkened in the same way as if
highlight boxes are present, but instead of (or in addition to) the boxes, a
circular "spotlight" will be shown around the mouse cursor position, following
every motion of the mouse cursor.
+ key / - key or mouse wheel
Adjust the spotlight radius.
Z key
Toggle zoom mode. When this key is first pressed, the current page will zoom in.
The page will be displayed at double size, but in its original resolution (i.e. it
will be blurry). Impressive will re-render the page at the new resolution if the
graphics hardware supports it. During this time, Impressive will not accept any
input, so don't even think about clicking the mouse or pressing keys before the
image gets crisp again.
In zoom mode, all other functions will work as normal. Any operations that leave
the current page, such as flipping the page or entering the overview screen, will
leave zoom mode, too.
[ / ] key
Adjust the gamma value of the display (might not be supported on every hardware).
{ / } key
Adjust the black level of the display (might not be supported on every hardware).
\ key
Revert gamma and black level back to normal.
O key
This will toggle the "visible on overview page" flag of the current page. The
result will not be visible immediately, but it can be saved to the info script
(using the S key) and will be in effect the next time the presentation is started.
I key
This will toggle the skip flag of the current page. A page marked as skipped will
not be reachable with the normal forward/backward navigation keys.
B key / W key
Fade to black or white, respectively. This feature can be used if a whiteboard or
blackboard in front of the projection area is to be used during the presentation.
Using these two keys, the screen will fade into a solid color. On any keypress or
mouse click, it will fade back to normal. These keys are not available in overview
mode.
click&drag with RMB (right mouse button) in zoom mode
Move the visible part of the page in zoom mode.
Cursor keys in overview mode
Navigate through pages.
Alt+Tab keys
Leaves fullscreen mode to facilitate task switching while running full-screen
presentations.
Any other alphanumeric (A-z, 0-9) or function key (F1-F12) can be used to assign shortcuts
to pages that require quick access. If one of the keys is pressed together with Shift, the
currently displayed page is associated with this key. To recall the page later, it is
sufficient to press the shortcut key again. Shortcuts can be permanently stored with the S
key.
INFO SCRIPTS
Impressive offers a powerful way to customize individual presentations using so-called
info scripts. An info script is a text file having the same name and located in the same
directory as the presentation file itself, except for the additional suffix .info. Thus, a
presentation file called BrandNewProduct.pdf would have a info script with the name
BrandNewProduct.pdf.info. If multiple arguments were specified on the command line, the
info script will be called just .info (a dot file, so to speak). If a directory name was
specified as the only argument, either a file called DirectoryName.info or a file called
.info inside the directory will be used, depending on whether a path separator was
specified at the end of the directory name or not - Impressive simply appends .info to
whatever the input path name was.
In any case, the default file name can be overridden by the -I command line option.
Info scripts are actually Python scripts with full access to Impressive's global data
structures and functions. (It is possible to write real interactive applications using
info scripts.) Thus, they can modify a broad range of settings concerning Impressive. This
manual will only cover the most basic ones.
PAGE PROPERTIES
The main part of an info script defines the properties of each page. At the moment, the
following properties are defined:
title
Each page can have a title that is displayed in the Impressive window's title bar.
If there is no title explicitly specified in the info script, the title of the page
will be extracted from PDF metadata if pdftk is installed, or the image file name
will be used if the presentation is an image slideshow.
transition
With this property, the transition class to be used for rendering the transition
between this page and the following page can be specified. For pages lacking this
property, random transitions will be chosen. A list of available transition classes
can be obtained with impressive -l.
transtime
This property overrides the global transition time parameter (-T at the command
line). It contains the integer time (in milliseconds) the transition between this
page and the following page shall be shown.
overview
This property holds a boolean value (0/False or 1/True) that specifies whether the
page shall be included in the overview page. If this property isn't specified, it
is assumed to be True.
skip
This boolean property can be set to 1/True if the page shall be skipped during the
presentation.
Pages with overview:True, skip:False will be accessible both by cycling through the
pages and using the overview page,
pages with overview:True, skip:True will be silently skipped in the normal page
cycle, but remain accessible from the overview page,
pages with overview:False, skip:False will appear in the normal cycle, but not on
the overview page
and pages with overview:False, skip:True will not be accessible at all.
boxes
This property stores a list of highlight box coordinates. Normally, there is no
need to edit this by hand, as Impressive handles this automatically if the S key is
pressed.
timeout
If a timeout property is present and the page is shown, Impressive will
automatically switch to the next page after the specified number of milliseconds.
Normally, the timeout will only be effective the first time the page is shown
unless wrap mode is used (command-line option -w or --wrap). This restriction makes
it possible to create self-running presentations with individual per-page timeouts.
comment
This property can hold a string with a single line of text that will be displayed
on screen while the page is shown. Display of this text can not be disabled.
sound
Specifies the file name of a sound file to be played (via MPlayer) when the page is
first entered. Once started, the sound will be played until its end is reached,
another sound or video is played, or Impressive is exited.
video
Specifies the file name of a video file to be played when the page is first
entered. The video will be displayed full-screen. Any key or mouse click stops
playback, except the cursor keys, which are used to seek in the video file, and
space, which can be used to pause playback. Note that this function is highly
experimental and might not work reliably on every system!
always
If this property is present and set to 1 or True, the media file specified in the
sound or video properties will be played every time the page is entered, not just
the first time.
progress
If this property is set to zero, the presentation progress bar (which is usually
set up with the -d/--duration command line switch) will not be shown on this page.
In practice, it might be useful to hide the bar from the first page so that it is
not visible during the introduction.
reset
If this property is set to 1 or True, the timer will be reset each time this page
is left, just as if the R has been pressed. If the special value 2 or FirstTimeOnly
is used, the reset will only take place if the page was shown for the first time.
Again, this is particularly useful on the first page: A combination of
progress:False, reset:FirstTimeOnly makes it possible to set up the presentation
long before it actually begins - the first page can be showed as long as desired,
actual timing starts at the second page.
rotate
This property is a per-page override of the global -r command line option: It
specifies how the page shall be rotated, in 90-degree steps clockwise.
OnEnter, OnLeave, OnEnterOnce, OnLeaveOnce
These properties can contain a Python callable (i.e. a function reference or lambda
expression) that is executed when the page is entered or left. The ~Once variants
will only be executed when the page is entered or left for the first time. The
callable must not take any arguments. This feature can be used to associate
arbitrary Python code with specific pages, for example to execute external
programs.
Warning: Lambda expressions cannot be properly processed by the Info Script save
function (S key). If Impressive encounters lambda expressions when saving, it will
remove them. In addition, it will not overwrite the original info script, but
generate an extra file that needs to be merged withe the original script by hand.
keys
This property can be assigned a dictionary that maps alphanumerical keys to Python
functions. For example, 'keys': { 'x': SomeFunction } will invoke SomeFunction() if
the lowercase character 'x' is typed while the page is displayed. Regarding the
functions, the same restrictions as for the OnEnter/OnLeave family apply: the
function must not take any parameters and lambda functions can not be saved. Also
note that it is not possible to overwrite Impressive's pre-defined key bindings
with this method.
The properties are stored together in a Python dictionary called PageProps. The syntax
looks like in this example:
PageProps = {
1: {
'title': "Title Page",
'transition': PagePeel,
'sound': "background_music.mp3"
},
2: {
'title': "Another Page",
'timeout': 5000
}
}
The PageProps definition (and only the PageProps definition) will be rewritten by
Impressive if the S key is pressed. User-defined PageProps entries will also be left
untouched, except for some pretty-printing.
GLOBAL PRESENTATION PROPERTIES
The name of the presentation is shown in the title bar of the Impressive window (if not in
fullscreen mode). By default, the file name or (if available) PDF metadata title will be
used for this purpose, but the presentation title can also be explicitly set by
overwriting the DocumentTitle variable:
DocumentTitle = "My Presentation"
Another useful variable, AvailableTransitions, contains a list of all transition classes
that may be used for randomly assigning transitions to pages lacking the transition
property. Thus, if you want to exclude a certain transition (either because you don't like
it or because you want to have it exclusively on pages where you manually assigned it
using PageProps), you can write something like
AvailableTransitions.remove(WipeBlobs)
On the other side, it's possible to activate transitions that are not enabled by default:
AvailableTransitions += [SlideUp, SlideDown]
Alternatively, you can completely overwrite AvailableTransitions to have the same
transition (or set of transitions) assigned to all pages:
AvailableTransitions = [Crossfade]
OPTION OVERRIDES
Another use of info scripts is overriding the default or command-line settings on a
per-file basis. This can be done by simply overwriting one of the variables that are
defined at the beginning of impressive.py. Each of these variables corresponds either to a
command-line setting, or to some constant related to visual appearance or performance. So,
for example, to force fullscreen mode for a presentation, write
Fullscreen = True
AUTHOR
Impressive and its documentation has been written mainly by Martin J. Fiedler
<martin.fiedler@gmx.net>, with small portions of the code written by external
contributors. See the source code file for details.
REPORTING BUGS
Report bugs to to <martin.fiedler@gmx.net>.