gfx2pce [options] png/bmp/pcx/tga filename ...
where filename is a 256 color PNG, BMP, PCX or TGA file
-gb
Add blank tile management (for multiple bgs)-gs(8|16|32|64)
Size of image blocks in pixels [8]
-m!
Exclude map from output-m
Convert the whole picture-mp
Convert the whole picture with high priority-mn#
Generate the whole picture with an offset for tile number where # is the offset in decimal (0 to 2047)-mR!
No tile reduction (not advised)
-p!
Exclude palette from output.-pc(16|128|256)
The number of colors to use [256]-po#
The number of colors to output (0 to 256) to the filename.pal-pe#
The palette entry to add to map tiles (0 to 16)-pr
Rearrange palette, and preserve palette numbers in the tilemap-pR
Palette rounding
-f[bmp|pcx|tga|png]
Convert a bmp or pcx or tga or png file [bmp]
-n
No border-q
Quiet mode
gfx2pce -po16 -gs8 -pc16 -pe0 -fpng -n -m -gb myimage.png
This will convert a myimage png file to a map/pal/pic files with 16 colors,palette entry #0, 8x8 tiles, a blank tile, a map, no border, 16 colors output.