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[comment {-*- tcl -*- doctools}]
[vset FORMATNAME ppm]
[vset FORMATFULLNAME {Portable Pixmap format}]
[include format-header.inc]
This handler provides additional configuration options. See
section [sectref {PPM OPTIONS}] for more detailed explanations.
[include format-middle.inc]
In addition the value for the option is treated as list and may
contain any of the special options listed in section
[sectref {PPM OPTIONS}].
[list_end]
[section {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.
[example_begin]
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 |
[example_end]
[section {PPM OPTIONS}]
The handler provides the following options:
[list_begin definitions]
[lst_item "[option -verbose] [arg bool]"]
This option is supported for reading and writing.
[nl]
If set to [const true], additional information about the loaded/stored image
is printed to stdout. Default is [const false].
[lst_item "[option -scanorder] [arg string]"]
This option is supported for reading only.
[nl]
Specify the scanline order of the input image.
Possible values: [const TopDown] or [const BottomUp]. Default is [const TopDown].
[lst_item "[option -gamma] [arg float]"]
This option is supported for reading only.
[nl]
Specify a gamma correction to be applied when mapping
16-bit input data to 8-bit image values.
Default is [const 1.0].
[lst_item "[option -min] [arg float]"]
This option is supported for reading only.
[nl]
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.
[lst_item "[option -max] [arg float]"]
This option is supported for reading only.
[nl]
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.
[lst_item "[option -ascii] [arg bool]"]
This option is supported for writing only.
If set to [const true], the file is written in PPM 8-bit ASCII format (P3).
Default is [const false], i.e. write in PPM 8-bit binary format (P6).
[list_end]
[list_begin definitions]
[include format-footer.inc]
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