Issues with ATI2_3Dc normal maps

[starkgate]

Another issue I noticed, this time with normal maps from the game Mass Effect 2 (ATI2_3Dc, another customized format by Bioware, I believe).
In the screenshot below, you can see on the left what the texture looks like with your plugin, and on the right what it should look like.

Testing texture :
MASSEFFECT2.EXE_0x3AF35864.zip

[starkgate]

So, here is the initial normal map, loaded with your plugin in PS CC 2015 :

Note, that going into Image > Adjustments > Invert makes it so PS displays the normal map just about correctly.

You also have to swap the R and G channels through Image > Adjustments > Channel Mixer, since they're loaded the wrong way around by the plugin.

For comparison, before swapping the channels :

After :

The image displayed is still not perfectly identical to what it should be. I'm comparing the image displayed in PS to one displayed in a tool made specifically for modding Mass Effect 1-2-3.

It still can't save it properly, too, the preview when saving shows it :

I suppose ATI2_3Dc is not exactly similar to BC5, which must be why your plugin has issues with it.

Hope it helps !