Re-indexation to images (GIMP)

[Tobruk]

Hello!

Recently I edited lots of .bmp's and I re-indexated (I mean: image >> mode >> from RGB to indexed >> the proposed pallet) those images in GIMP, because I want become them thinner (less occupied memory).
Than I launch the game and LF don't changing BLACK to ALPHA CANNAL.

Why?


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SORRY FOR WRONG SECTION. I WAS STARED.
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[A-Man]

The RGB formation of the black color should be (0, 0, 0) or U can say 'pure' black. If the black color formation is for example (0, 0, 1), it will not be recognized as the color key.

[Tobruk]

But why? RGB image was fine, and re-indexed not fine?

[Gad]

Usually black gets changed to something else than #000000. While you're indexing check the palette of colors carefully to avoid this. Be sure, that black color won't be changed.

[Bamboori]

alternatively you can also index it, turn it rgb again, make the almost black real black and index it again.

[Gad]

That doesn't make sense. If you index it the real black will get changed.

[Bamboori]

well actually not. you replace all the almost black color with black, so there is no reason for the graphics program to convert it back to a color that doesnt exist in the image.

try it if you dont believe me

edit: @Gad below: weird... it works fine for me in photofilter :/

[Gad]

Somehow doesn't work for me.

[Som1Lse]

An even simpler way than what bamboori suggests would be to show the "Colormap"-dialog (Windows>Dockable dialogs>Colormap), and simply change the color of the black to "000000" (it's the field saying "HTML notation").