Hey all. I'm using Photoshop CS6 on a Mac (OS X 10.8.2), and I've run into a wierd problem I've never seen before. I'm creating a seperate layer over a photo, and filling that layer with 50% gray. I then set that layer's blending mode to Overlay. When things are working correctly (and they always have in the past) setting the 50% gray layer to Overlay should render that layer invisible, and it should have no visual effect on the photo underneath. Suddenly this is not the case, and it looks like the grayscale in the photo beneath the gray layer is much brighter. What's really weird is that I tried to recreate this problem on a couple of other pic files, and the Overlay blending mode works fine there! So the problem seems to be only with this one file. Changing the file from CMYK to RGB seems to lessen the effect, but it's still present. I'm sure I'm missing something, but I'm totally stumped. Any help or ideas would be most appreciated. Thanks in advance!
Well, I figured out my problem. Because I happened to have 50% gray from selected from the Swatches palette as my foreground color, I just filled my blending layer with that. This gray, it turns out, is NOT the same 50% gray found when using Edit > Fill > 50% Gray. The latter is a neutral gray, and is the one you want to use when dealing with blending modes.