Translates pixel color in SrcFormat to DstFormat.

procedure TranslatePixel(SrcPixel: Pointer; 
                         DstPixel: Pointer; 
                         SrcFormat: TImageFormat; 
                         DstFormat: TImageFormat; 
                         SrcPalette: PPalette32; 
                         DstPalette: PPalette32);

ImagingFormats (at line 122)