Tools to set differences between a lot of PNG images (anim frames)

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Project Description

I need a software tool that read and modify a series of png images (usually frames of an anim) : from the previous frame it must replace every pixel of the actual frame of the same color with a special transparent pixel. This is necessary to reduce size of frames .
To increase the size of "reduction" should be set a "value quality level": 100 means to replace only the pixel of the SAME color of the previous frame, 50 means to find all the colors "around" the value of the pixel color of previous frame.
We call it "delta animaion" and we use it in an embedded enviroment.

The software must run under windows xp .
We already have such a software but it works only with a big file with frame inside. We lost sources...
Please note the results of our software wtih quality 100 (no lossy) of the simb_scarab_winR.png. The original is the other files.

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