NAME

       jp2a - convert JPEG images to ASCII

SYNOPSIS

       jp2a [ options ] [ filename(s) | URL(s) ]

DESCRIPTION

       jp2a will convert JPEG images to ASCII characters.  You can specify a mixture of files and
       URLs.

OPTIONS

       -      Read JPEG image from standard input

       --background=light --background=dark
              If you don't want to mess with --invert all the time, just use these  instead.   If
              you  are using white characters on a black display, then use --background=dark, and
              vice versa.

       -b --border
              Frame output image in a border

       --chars=...
              Use the given characters when producing the  output  ASCII  image.   Default  is  "
              ...',;:clodxkO0KXNWM".

       --colors
              Use truecolor (or ANSI color if truecolor is not supported) for text output and CSS
              color for HTML output.

       --color-depth=...
              Use a specific color-depth for terminal output. Valid values are: 4 (for  ANSI),  8
              (for 256 color palette) and 24 (for truecolor or 24-bit color).

       -d --debug
              Print debugging information when using libcurl to download images from the net.

       -f --term-fit
              Use the largest dimension that makes the image fit in your terminal display.

       --term-height
              Use terminal display height and calculate width based on image aspect ratio.

       --term-width
              Use terminal display width and calculate height based on image aspect ratio.

       -z --term-zoom
              Use terminal display width and height.

       --fill When  used  with  --html and --color, then color each output character's background
              color.  For instance, if you want to use fill-output on a light background, do

              jp2a --color --html --html-fill --background=light somefile.jpg --output=dark.html

              To do the same on a light background:

              jp2a --color --html --html-fill --background=dark somefile.jpg --output=light.html

              The default is to have fill disabled.

       -x --flipx
              Flip output image horizontally

       -y --flipy
              Flip output image vertically

       --height=N
              Set output height.  If only --height  is  specified,  then  output  width  will  be
              calculated according to the source images aspect ratio.

       -h --help
              Display a short help text

       --grayscale
              Converts image to grayscale when using --html or --colors.

       --html Make  ASCII  output  in  strict  XHTML 1.0, suitable for viewing with web browsers.
              This is useful with big output dimensions, and you want to check the result with  a
              browser with small font.

       --html-fill
              Same as --fill.  You should use that option instead.

       --html-no-bold
              Do not use bold text for HTML output.

       --html-raw
              Output  only  the  image in HTML codes, leaving out the rest of the webpage, so you
              can construct your own.

       --html-fontsize=N
              Set fontsize when using --html output.  Default is 4.

       --html-title=...
              Set HTML output title.

       --output=...
              Write ASCII output to given filename.  To explicitly specify standard  output,  use
              --output=-.

       -i --invert
              Invert  output  image.   If  you  view a picture with white background, but you are
              using a display with light characters on a dark background, you should  invert  the
              image.

       --red=...

       --green=...

       --blue=...
              When  converting  from  RGB  to  grayscale,  use  the  given  weights  to calculate
              luminance.  These three floating point values must add  up  to  exactly  1.0.   The
              default is red=0.2989, green=0.5866 and blue=0.1145.

       --size=WIDTHxHEIGHT
              Set output dimension.

       -v --verbose
              Print some verbose information to standard error when reading each JPEG image.

       --width=N
              Set  output  width.   If  you only specify the width, the height will be calculated
              automatically.

       -V --version
              Print program version.

       --zoom Sets output dimensions to your entire terminal window,  disregarding  source  image
              aspect ratio.

RETURN VALUES

       jp2a returns 1 when errors are encountered, zero for no errors.

EXAMPLES

       Convert and print imagefile.jpg using ASCII characters in 40 columns and 20 rows:

       jp2a --size=40x20 imagefile.jpg

       Download an image off the net, convert and print:

       jp2a http://www.google.com/intl/en/logos/easter_logo.jpg

       Output  picture.jpg  and  picture2.jpg,  each  80x25  characters,  using  the characters "
       ...ooxx@@" for output:

       jp2a --size=80x25 --chars=" ...ooxx@@" picture.jpg picture2.jpg

       Output image.jpg using 76 columns, height is automatically calculated from aspect ratio of
       image.jpg

       cat image.jpg | jp2a --width=76 -

       If  you  use  jp2a  together  with  ImageMagick's convert(1) then you can make good use of
       pipes, and have ImageMagick do all sorts of image conversions and effects  on  the  source
       image.  For example:

       convert somefile.png jpg:- | jp2a - --width=80

       Check  out convert(1) options to see what you can do.  Convert can handle almost any image
       format, so with this combination you can convert images in e.g. PDF or AVI files to ASCII.

       Although the default build of jp2a includes automatic downloading of  files  specified  by
       URLs, you can explicitly download them by using curl(1) or wget(1), for example:

       curl -s http://foo.bar/image.jpg | convert - jpg:- | jp2a -

DOWNLOADING IMAGES FROM THE NET

       If you have compiled jp2a with libcurl(3), you can download images by specifying URLs:

       jp2a https://user:pass@foo.com/bar.jpg

       The protocols recognized are ftp, ftps, file, http, https and tftp.

       If  you  need  more control of the downloading, you should use curl(1) or wget(1) and jp2a
       read the image from standard input.

       jp2a uses pipe and fork to download images using libcurl (i.e., no exec or  system  calls)
       and therefore does not worry about malevolently formatted URLs.

GRAYSCALE CONVERSION

       You can extract the red channel by doing this:

       jp2a somefile.jpg --red=1.0 --green=0.0 --blue=0.0

       This  will  calculate luminance based on Y = R*1.0 + G*0.0 + B*0.0.  The default values is
       to use Y = R*0.2989 + G*0.5866 + B*0.1145.

PROJECT HOMEPAGE

       The    latest    version    of    jp2a    and    news    is    always    available    from
       https://github.com/cslarsen/jp2a

SEE ALSO

       cjpeg(1), djpeg(1), jpegtran(1), convert(1)

BUGS

       jp2a does not interpolate when resizing.  If you want better quality, try using convert(1)
       and convert the source image to the exact output dimensions before using jp2a.

       Another issue is that jp2a skips some X-pixels along each scanline.   This  gives  a  less
       precise output image, and will probably be corrected in future versions.

AUTHOR

       Christian Stigen Larsen and Christoph Raitzig

       jp2a  uses  jpeglib  to  read  JPEG  files.  jpeglib is made by The Independent JPEG Group
       (IJG), who have a page at http://www.ijg.org

LICENSE

       jp2a is distributed under the GNU General Public License v2.