irregular colors in game objects

[Daniel Arturo Marín Oroz]

I am a beginner in open bor but I do not understand how to make the objects have the color they should, because if I edit the original images the colors are correct but it really looks bad, very pixelated, while if I create a new gif and place it in the game, the colors are not correct and it looks really bad

 

[danno]

Are you resizing images? If so which program are you using? Can you actually show us the problem? Maybe an image or video