BSP means Binary Space Partioning and is widely used in 3D game levels such as Quake, Soldier of Fortune, Half-life etc. It is also a file format for uses in such games. What it does is it uses complex algorithms called octrees which tells the 3D engine of the game what polygons are onscreen or not, so they can be rendered efficiently for maximum game performance. But most of all, IT HAS NOTHING TO DO WITH SPRITES ;D.
I think you mean PSP or something like that. Well, PSP is another file format made especially for use with the image program called Paint Shop Pro. Unfortunately, DBP does not support this file format. But that is not unusual. DirectX, or OpenGL itself doesn't support this format. Why? Well its for use only with Paint Shop Pro, and it is not a popular format. It's just the same with Adobe Photoshop, which makes PSD files.
What you would have to do is, make a image in a image program like PSP. Save it in the file format of PSP. This is going to be your draft copy or master copy. Then you color the parts of the image that you don't want to be shown onscreen to whatever color you want (magenta [rgb(255,0,255)] or black [rgb(0,0,0)] is good). This color is going to be declared transparent. Then press Ctrl+F12 to "save copy as" and save it as a BITMAP, which is supported by DB. If you want to save space then export it to JPEG or JPG.
In DB, type "set image colorkey rgb(255,0,255)" or whatever the color you chose to be see through or transparent. Then simply load the image into DB and do whatever.
Sorry if that confused you
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