Kunio-Kun (Alex)

[Silverthorn]

The sprites are pixelated.. Is it possible to make them smooth? If I use blur effects in photoshop, it will make dirty pixels..

You'll have to isolate the sprite from the background first. Lock the transparency and then apply the blur filter. You'll probably end up with something like that:


It still retains that pixelated look, though. You can try experimenting with elements in "Filter>Filter Gallery..." if there is anything more suited for your needs but in the end, truly getting rid of pixelation requires you to actually paint things. There is no way around that.

And what do I have to do to make my BMP in index mode?

Counter-question: why do you want to do that in first place? Apart from reducing the file size of bitmaps, there isn't any valid reason to do that nowadays, considering that you may decrease the quality of your sprites as well...
"Image > Mode > Indexed Color..."