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img-ppm(n) 2.0 Img 2.0 Reference Manual "Img"

Name

img-ppm - Portable pixmap format (ppm)

Table Of Contents

Synopsis

  • package require img::ppm ?2.0?

Description

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 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 of option -format is treated as a list and may contain any of the special options listed in section Options.

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.

Supported Types

This handler supports the PPM (Truecolor) and PGM (Grayscale) image formats. There are two types of PPM/PGM files: Binary and ASCII. The values stored in PPM/PGM files can be unsigned 8-bit or unsigned 16-bit values.

 Image             |     Read      |     Write     |
 type              | -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    |

Options

The handler provides the following options:

-verbose bool

This option is supported for reading and writing. Available since version 1.4.0.

If set to true, additional information about the read or written image is printed to stdout. Default is false.

-scanorder string

This option is supported for reading only. Available since version 1.4.0.

Specify the scanline order of the input image. Possible values: TopDown or BottomUp. Default is TopDown.

-min double

This option is supported for reading only. Available since version 1.4.0.

Specify the minimum pixel value to be used for mapping 16-bit input data to 8-bit image values. If not specified or negative, the minimum value found in the image data.

-max float

This option is supported for reading only. Available since version 1.4.0.

Specify the maximum pixel value to be used for mapping 16-bit input data to 8-bit image values. If not specified or negative, the maximum value found in the image data.

-gamma double

This option is supported for reading only. Available since version 1.4.0.

Specify a gamma correction to be applied when mapping 16-bit input data to 8-bit image values. Default is 1.0.

-ascii bool

This option is supported for writing only. Available since version 1.4.0.

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, img-bmp, img-dted, img-flir, img-gif, img-ico, 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