[Endoperez]

In windowed mode, the image shown when viewing the details of the unit is in the default resolution, and PrintScr copies the sprite as-is.

I have a black map I use for extracting sprites. Well, I haven't extracted any in a long time, but I just tested and this still works fine. In the Video settings, I put Opacity down to 0 and Filtering off. Then I just zoom to the black map and open the unit details window. so that the unit sprite is against black background. You can only get the first sprite this way, not the attack sprite.

If this wasn't clear enough, I can update my old extraction guide for Dom3. Example JPG, which is BIG for a JPG, attached.