If you are working linear in Maya, you probably add gamma correct nodes between each texture and it’s material.

This MEL script will add a gamma correct node (set to gamma .45) between a selected texture and it’s selected target material, and it will attach the network to the material’s color attribute.

Before you run the script:
first select the material and the texture that you want to attach to it.

string $mySel[] = `ls -sl`;
string $myMaterial[] = `ls -mat $mySel`;
string $myTex[] = `ls -tex $mySel`;
string $myGamma = `shadingNode -asUtility gammaCorrect`;
setAttr ($myGamma + ".gammaX") 0.45;
setAttr ($myGamma + ".gammaY") 0.45;
setAttr ($myGamma + ".gammaZ") 0.45;
connectAttr -force ($myTex[0] + ".outColor") ($myGamma + ".value");
connectAttr -force ($myGamma + ".outValue") ($myMaterial[0] + ".color");