Talk:Petit Computer 3/@comment-5106053-20140603221535/@comment-15296152-20140604004541

It's still 15-bit (5-bit per component) on the DSi hardware. The last bit is omitted for palette colors, but in direct-color textures/graphics, the last bit is used to determine transparency, whereas palette textures/graphics rely on index 0 for transparency.

http://problemkaputt.de/gbatek.htm#ds3dtextureformats

(Direct Color Texture described in this section, Palette color description just above)