convert ps2 textures to psp textures

[PunkDEverliving]

the image must be 8-bit with 4,8,16,32 colors (depending on the originial number of colors of the original texture.)

I only know how to save it like that in photoshop(because that's what i only use)
after you're done editing the texture press ctrl+shift+alt+s and you can choose the bit and number of colors.