www.creosite.com© O. Corten

creo4 config.pro option documentation for: TIFF_TYPE            

tiff_type

palette , rgb * , grayscale , mono
Determines the type of TIFF items that are exported and identifies the color to use. Shaded images are exported to the TIFF format as 24-bit RGB images, by default. Palette color (level 3) mode is also supported.
You can set tiff_type to any one of the following values, when you select TIFF as the plotter type:
palette - 8-bit colors
rgb - 24-bit colors
grayscale - Gray scale colors
mono - Black and white
 
* Plotting to TIFF does not support shaded images.