Previewing clipped pixels

In this movie I'll show you a special hidden trick for previewing exactly…which pixels in your image are clipping to either black or white on a…channel-by-channel basis which is another great way to gauge the quality of your correction.…I've gone ahead and broken my Properties panel off here so that I can see more of…my image at a time. And I'm going to go ahead and click on the first levels…adjustment, the one that's called Levels 1, so that we can see the adjustment…that's been applied to the overall image.…We know that some of the pixels inside the image are clipping to white because…we can see the clip over here in the Histogram panel on the far right side, but…as to where those pixels are clipping, we really don't know.…

But we can find that out by pressing the Alt key or the Option key on the Mac,…and dragging the White slider.…And so at this point, I'm seeing a lot of clipping but here's how you read…this, just so you know.…Anywhere where you see black means that there is no clipping going on…whatsoever, anywhere where you see white those are pixels that are clipping…