CApp Failed to open source file. Raster band count of source file must be either 3 or 4. Calculate optimal color table from source file Failed to create color table. Failed to open file with palette. Palette file does not have a single band with a color table The color table must not contain a "no data" value and it's size must not exceed 255 colors. Save color table to: %1 Failed to create target file. Dither source file to target file Failed to dither file. Apply alpha channel as no data value to target file Failed to read from alpha channel. Failed to read from target file. Failed to write to target file. main Convert a map file with RGBA color coding to a color palette coding. Source file. Target file. Number of colors. (default: 255) Input palette file for color table (*.vrt) Save color table to palette file (*.vrt) There must be a source and destination file. --ncolors must be an integer value less than 256