[Metafalica]

Hello. I have huge problem: when I convert redrawn BMP back to BS it changes gamma, so red things turns into yellow and etc.
I tried using mc32 and menc. Both gives same result.
I used v3 and v2 MDEC versions of mc32, but nothing helps.
First picture is original, second is same, but reconverted. What can be done in this case? How other peoples redraw MDEC images in psx? What tools are they use?