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Wow nice work! This does *exactly* what I wanted it to do! Thank you so much. Here is what I've discovered so far:

• There is the odd crash sometimes. I can upload the files that crash it if you'd like. It might have something to do with if I make one of the colours have a transparency flag.
• It doesn't seem to load the PNGs I have with the correct palette order. I still have to re-arrange the order. I sometimes use old programs like PaintshopPro to save the PNG files, and in that program they are most certainly in the right order. So It'd be cool to have an 'arrange palette by hue' button or something if the index doesn't get loaded right
• When saving the PNG file, the colours don't seem to be indexed correctly either (saved with PixelPaletteTool, opened in GIMP)
• When an image does load with the correct index, there are weird artifacts in the mapped image.. like it shows a random colour strip under the image, I don't know what's up. 

Other than that, it is really on its way there! Holy Cow I did not expect a developer to be so quick on the draw to add a request.. so here's another LOL

What if... 

1. I load a 16-colour indexed image, grayscale from black (0 0 0) to white (255 255 255). The palette is arranged correctly in a nice gradient.
2. I load a palette with 256 colours.
3. I shift-click on the 1:1 icon - great, it replaces the grayscale with my palette (the first 16 colours). 
4. Now here is where the new feature comes in: "SHIFT BY INDEX COUNT" or something to that effect. The program will now grab the next 16 colours in the strip and replace the index with those colours. So if my original PNG has 64 colours, if I'd load up a 256 colour palette it would shift by 64 so I could try out 4 different patterns, etc.

It's not *quite* colour-cycling per se, it's something a bit different.

Anyway, *so happy* again you're doing this, I feel it's already at a place where I can play around with it and see what it can do. 

Long story short - I used to run this Street Fighter III - Third Strike animation appreciating site, and I played around a lot with palettes, swapping them in my animated GIFs and everything, but then family happened and I couldn't dedicate time anymore to it. This whole thing is getting me excited again for these sprites, and I'm really looking forward to see what you can do.

Thanks again!