Alferd Spritesheet Unpacker
is a small spriting tool which quickly cuts a sprite sheet rip into single frames.
ASU has native support for all standard bitmap formats, .png, .bmp, .gif, .tiff.
it supports over 400+ graphics formats including .pcx for all Mugen users and Mugen developers. That includes unpacking a .pcx sprite sheet and exporting a standard sprite sheet to individual .pcx files. Thanks to NConvert
Alferd Sprite sheet unpacker also supports indexed colours.
It's a really simple tool which automatically determines the sprite sheet bitmap background colour which can be used to set transparency in the exported frames and automatically determines the boundaries of the sprite sheet frames.
It's free so why not give ASU
a go. It could save you a lot of tedious work manually splitting sprite sheets using cut, crop and paste.
that's Alferd not Afred.