Fur Fighters Dreamcast/PC .spr modding

If you want to save your own spr files, there are some steps to get them to work. If the texture is only shades of grey there is no change to it other then pvr to spr header swap. Save the texture as rectangle argb 1555. Replace the 16 byte pvr header for 12 byte spr header. For colored textures, there is one step with the image before pvr export. Swap rgb for bgr. Then it is the same as the shades of gray to convert.

Tools used
Image viewer/editor(infranview for color swapping)
WinPvr: Pvr export
Pvr Viewer: View pvr with alpha
Pspicture: View spr
Hexedit: change headers