DigImage Compressed Files

Contents Summary

Introduction
PostScript printer
:::: TYPES OF POSTSCRIPT
:::: CONVERTING POSTSCRIPT FILES
:::: CHANGING THE LAYOUT OF POSTSCRIPT FILES
:::: SPLITTING POSTSCRIPT FILES
:::: OTHER CHANGES TO POSTSCRIPT FILES
:::: CHANGING APPEARANCE
:::: CONVERTING IMAGES TO POSTSCRIPT
PaintJet printer
LaserJet printer
Windows .BMP files
GIF Files for World Wide Web and Other Applications
DigImage Raw Files
DigImage Compressed Files
Saving images for later conversion by DigiFile
Index

8 DigImage Compressed Files

The DigImage compressed file format is an adaptive run-length encoded format. for each bit plane of the image. This format is much more efficient in terms of disk space, but less efficient in terms of speed than the other formats. Details of the format may be found in the Development System documentation for SaveCompressedBuffer(..).

The command line for this variant of DigiFile is

C:..> DIGIFILE image_file /FC output_file [/O output_lut]
        [/W iw0 iw1 jw0 jw1] [/NB bit_planes]
        [/D [buffer]]

The output_file must be specified. The other command line switches have the following effect:

Switch	Effect
/O output_lut	This switch specifies the output look up table to be stored with the raw image file. If not specified, then the output look up table for the input image will be used.
/W iw0 iw1 jw0 jw1	This switch may be used to reduce the size of the source window to be converted to the raw output file. If not present, then the entire source image will be used. If the source image file itself were saved as a window, then the top left corner of the image is loaded to coordinates 0,0 (not the original position of the window) and so the new sub-window coordinates should be relative to this.
/NB bit_planes	This switch sets the number of bit planes (1 to 8) to be included in the compressed file. If not specified, then DigiFile will default to all eight bit planes.
/D [buffer]	If the /D switch is included by itself, then the image, once loaded, will be displayed on the computer monitor. If buffer is also included, then the image will be displayed on the frame grabber monitor using the specified buffer number. Note that this last option is the only one for which DigiFile requires the frame grabber card to be installed.

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Links

DIGIFILE

Index

OTHER

DigImage documentation page
DigImage home page
Stuart Dalziel's home page