libggigcp(7) GGI extension for color and palette

DESCRIPTION

LibGGIGCP is a generic color and palette management extension. It supports conversion between different color spaces such as RGBA, YUV, HSV and CMYK.

ENVIRONMENT VARIABLES

GCP_DEBUG
The debugging level for LibGGIGCP:
0 or unset
debug output is off; debugging is off

255
all debug output is on

You may also bitwise-or any of the following together:

  • 2 : debug core
  • 4 : debug mode setting
  • 8 : debug color handling
  • 16 : debug drawing
  • 32 : misc debugging output
  • 64 : debug dynamic library handling
  • 128 : debug event handling

The debugging output can be quite verbose and in most cases you should redirect stderr so that it does not interfere with your program's output.

GCP_DEBUGSYNC
Turn on synchronous debugging output, flushing the output buffers before returning from DPRINT calls.

GGI_CONFDIR
Override compiled-in path to global config files (Win32 only, but not Cygwin).

Note that the last environment variable really begin with GGI, and not GCP.