Provided by: libtk-img-doc_1.4.2+dfsg-2_all 
NAME
img-ppm - Img, Portable Pixmap format (ppm)
SYNOPSIS
package require Tk
package require img::ppm ?1.4?
image create photo ?name? ?options?
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DESCRIPTION
The package img::ppm is a sub-package of Img. It can be loaded as a part of the complete
Img support, via package require Img, or on its own, via package require img::ppm.
Like all packages of Img it does not provide new commands, but extends the existing Tk
command image so that it supports files containing raster images in the Portable Pixmap
format (ppm). More specifically img::ppm extends Tk's photo image type.
The name of the new format handler is ppm. This handler provides additional configuration
options. See section PPM OPTIONS for more detailed explanations.
All of the above means that in a call like
image create photo ?name? ?options?
[1] Image data in ppm format (options -data and -file) is detected automatically.
[2] The format name ppm is recognized by the option -format. In addition the value for
the option is treated as list and may contain any of the special options listed in
section PPM OPTIONS.
SUPPORTED PPM TYPES
This handler supports the PPM (Truecolor) and PGM (Greyscale) image formats. There are
two types of PPM/PGM files: RAW (binary) and ASCII. The values stored in PPM/PGM files
can be unsigned 8-bit or unsigned 16-bit values.
Grayscale (PGM): 8-bit and 16-bit, 1 channel per pixel.
Truecolor (PPM): 8-bit and 16-bit, 3 channels per pixel.
List of currently supported features:
Type | Read | Write |
| -file | -data | -file | -data |
---------------------------------------------------
PGM 8-bit ASCII | Yes | Yes | No | No |
PGM 8-bit BINARY | Yes | Yes | No | No |
PGM 16-bit ASCII | Yes | Yes | No | No |
PGM 16-bit BINARY | Yes | Yes | No | No |
PPM 8-bit ASCII | Yes | Yes | Yes | Yes |
PPM 8-bit BINARY | Yes | Yes | Yes | Yes |
PPM 16-bit ASCII | Yes | Yes | No | No |
PPM 16-bit BINARY | Yes | Yes | No | No |
PPM OPTIONS
The handler provides the following options:
-verbose bool
This option is supported for reading and writing.
If set to true, additional information about the loaded/stored image is printed to
stdout. Default is false.
-scanorder string
This option is supported for reading only.
Specify the scanline order of the input image. Possible values: TopDown or
BottomUp. Default is TopDown.
-gamma float
This option is supported for reading only.
Specify a gamma correction to be applied when mapping 16-bit input data to 8-bit
image values. Default is 1.0.
-min float
This option is supported for reading only.
Specify the minimum pixel value to be used for mapping 16-bit input data to 8-bit
image values. Default is the minimum value found in the image data.
-max float
This option is supported for reading only.
Specify the maximum pixel value to be used for mapping 16-bit input data to 8-bit
image values. Default is the maximum value found in the image data.
-ascii bool
This option is supported for writing only. If set to true, the file is written in
PPM 8-bit ASCII format (P3). Default is false, i.e. write in PPM 8-bit binary
format (P6).
SEE ALSO
img-bmp, img-dted, img-gif, img-ico, img-intro, img-jpeg, img-pcx, img-pixmap, img-png,
img-ppm, img-ps, img-raw, img-sgi, img-sun, img-tga, img-tiff, img-window, img-xbm, img-
xpm
KEYWORDS
image handling, ppm, tk
COPYRIGHT
Copyright (c) 1995-2009 Jan Nijtmans <nijtmans@users.sourceforge.net>