Everyone hade a problem with converting sprites or FX's cause of palletes.But now there is the easiest way to convert without using palletes.
You need:
-RAD Video Tools
Tutorial:
1.Open RAD Video Tools and select an image.
2.Click on Covert File... and press Yes...
3.Browse the output and in output file change into BMP File
4.Select Output as 256 colors and leave the setting(If you want you can change some) and press Batch...
5.Pres Start and wait...
That's all...