RGBGFX(1) General Commands Manual RGBGFX(1)


rgbgfxGame Boy graphics converter


rgbgfx [-DfFhPTVv] [-o outfile] [-d depth] [-p palfile] [-t mapfile] [-x tiles] file


The rgbgfx program converts PNG images into the Nintendo Game Boy's planar tile format.
The resulting colors and their palette indices are determined differently depending on the input PNG file:
The input image may not contain more colors than the selected bit depth allows. Transparent pixels are set to palette index 0.


Debug features are enabled.
Fix the input PNG file to be a correctly indexed image.
Same as -f, but additionally, the supplied command line parameters are saved within the PNG and will be loaded and automatically used next time.
-d depth
The bit depth of the output image (either 1 or 2). By default, the bit depth is 2 (two bits per pixel).
Lay out tiles horizontally rather than vertically.
-o outfile
The name of the output file.
-p palfile
Output the image's palette in standard GBC palette format - bytes (8 bytes for two bits per pixel, 4 bytes for one bit per pixel) containing the RGB15 values in little-endian byte order. If the palette contains too few colors, the remaining entries are set to black.
Same as -p, but the palette file output name is made by taking the input PNG file's filename, removing the file extension, and appending .pal.
-t mapfile
If any tiles are the same, don't place the repeat tiles in the output file, and make a tilemap file.
Same as -t, but the tilemap file output name is made by taking the input filename, removing the file extension, and appending .tilemap.
Truncate repeated tiles. Useful with tilemaps.
Print the version of the program and exit.
Verbose. Print errors when the command line parameters and the parameters in the PNG file don't match.
-x tiles
Trim the end of the output file by this many tiles.


The following will take a PNG file with a bit depth of 1, 2, or 8, and output planar 2bpp data:
$ rgbgfx -o out.2bpp in.png
The following creates a planar 2bpp file with only unique tiles, and its tilemap out.tilemap:
$ rgbgfx -T -u -o out.2bpp in.png
The following will do nothing:
$ rgbgfx in.png


rgbds(7), rgbasm(1), rgblink(1), rgbfix(1), gbz80(7)


rgbgfx was created by stag019 to be included in RGBDS. It is now maintained by a number of contributors at https://github.com/rednex/rgbds.
January 26, 2018 RGBDS Manual