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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'm 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 Levels1. So, that we can see the adjustment that's been applied to the overall image. And we know that some of the pixels inside the image are clipping to wide 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. Or we can find that out by pressing the Alt key or the Option key on a 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's no clipping going on whatsoever. Anywhere where you see white, those are pixels that are clipping in all three channels. That's very dangerous by the way. You don't want big regions of white like we're seeing here.
Otherwise the colors are showing us specific channels that are clipping. So, for example, if you're seeing red that means that pixels are clipping the light in the red channel but not in the green and blue channels. If you see blue, like up there in the sky, those pixels are clipping in the blue channel but they're not clipping in red or green. That's a lot less dangerous. And then where you're seeing other colors that don't have channels, like the yellow in the central portion of the image and the cyan up at the top, that tells you that they're clipping in two channels. So, yellow tells you you're clipping in both the red and green channels for example.
Cyan tells you you're clipping in both the green and blue channels. And again, that is more dangerous. Which is why this looks to be a pretty darn good correction here at 194, which is where I had it. We've got some clipping going on in the red channel and a little bit of clipping going on in the blue channel, but not that much. Now, for the most part the pixels aren't adjacent, meaning we don't have masses of clipping going on. To see where the pixels are clipping the black, you press and hold the Alt key once again. And you drag the Black slider triangle. And notice at this point I'll go ahead and clip a few things here.
Anywhere we're seeing white is not clipping to black. Anywhere we're seeing black is clipping to black. Otherwise, this was a little difficult to read because the colors are inverted. So, yellow means its clipping into blue channel. Red means it's clipping in both the green and the blue channels. So, you're basically reading things in the opposite direction. So, red is very dangerous. Black is very dangerous. Yellow not so much. Where I had the black point at 0, we're not seeing any clipping at all. However, that's just the clipping associated with that specific Adjustment layer.
If you want to test the overall composite image, you're going to have to click on the other Adjustment layer and test it out as well. And this will allow us to see exactly where we're clipping the black because this adjustment layer is the one that is doing the clipping. So, I"ll go ahead and press the Alt key or the Option key on a Mac and click and try and hold that little guy in the same place. And notice how we've got a clipping inside the window. And everywhere that is white is just fine, you may wonder well, what about the areas that are just in the standard colors they were in. They're not being affected because they're protected by the Layer mask.
So, it's just that mass of black pixels inside the window that's really clipping away. And to be perfectly honest with you, I'm not too concerned about that. I'm happy with the interior of that window being pretty much jet black. And that's how you go about previewing the location of clipped pixels. Pixels that are flipping either to black or to white on a channel by channel basis here inside Photoshop.
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