img-ppm(n) img-ppm(n) ______________________________________________________________________________
NAME
img-ppm - Img, Portable Pixmap format (ppm)
SYNOPSIS
package require Tk
package require img::ppm ?1.4?
image create photo ?name? ?options?
_________________________________________________________________
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 addi-
tional 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(n), img-dted(n), img-gif(n), img-ico(n), img-intro(n),
img-jpeg(n), img-pcx(n), img-pixmap(n), img-png(n), img-ppm(n),
img-ps(n), img-raw(n), img-sgi(n), img-sun(n), img-tga(n), img-tiff(n),
img-window(n), img-xbm(n), img-xpm(n)
KEYWORDS
image handling, ppm, tk
COPYRIGHT
Copyright (c) 1995-2009 Jan Nijtmans <nijtmans@users.sourceforge.net>
Img 1.4 img-ppm(n)
Mac OS X 10.8 - Generated Fri Sep 7 18:55:25 CDT 2012