Hello, peoples. I recently came across a good use for the 'difference' color filter, namely extracting watermarked/overlaid images with transparency from a background. It only extracts things with a single color, but it can be useful at times. So, let's say that one day you stumble across an image that looks like this: Gosh, that's a lovely 'A' logo! I think I'd like to stick it onto a green square. But wait! How do I take it off the circle with a subtle red gradient? To do this, you need a version of the background without the logo. With an image as simple as this, you may be able to recreate the background. Here the two layers are conveniently labeled 'background' and 'logo'. Now, with the 'logo' layer on top, set the blending mode to 'difference'. You now have a cyan 'A' in a black circle. To make the layer look that way without the blending mode, merge down the 'logo' layer onto the background 'layer' (you may want to duplicate the layers first if you want to keep them). Rename the 'background' layer 'logo'. Next, desaturate the logo (Image->Adjustments->Desaturate). Set the blend mode to 'screen'. You can now put it on your green square! You can adjust the brightness (Image->Adjustments->Brightness/Contrast...) to make the logo more visible. To make the logo black, invert the image (Image->Adjustments->Invert) and change the blend mode to 'multiply'. So, how is this useful? If you want to make a new health bar but keep the thing inside the hardcore hearts, you can extract it. I used this technique with the IC textures to get the sticky resin image from the tree to use as an item. I used the resulting white resin-shaped image as a mask, to get just the resin part. And that concludes my tutorial. Have fun!