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In this movie, I'll show you how to customize your levels adjustment to get even better results. I'm currently looking at the auto adjusted version of the image. Notice down here below the histogram. We have three triangles. The first one represents the black point. The last one represents the white point, and the middle one, the gray one is the gamma value. I'll show you how to modify the black, and white points in this movie and then in the next movie, we'll deal with the gamma value. Now, notice down here at the bottom, there's this option that allows us to reset the adjustments to their defaults.
I'm going to go ahead and click on that. So that we can see the unadjusted image. Notice these values below the triangles. They correspond to each one of the points here. So by default, the black point is zero, which is the value for black. And the white point is 255 which is the value for white. I'll go ahead and once again click on the Auto button so that you can see those values update. Now we're seeing the white point is set to 229 and the black point is set to 4. What this means is anything with an a luminance level of 4 or darker in the image is going to be clipped to black.
And that does include a few pixels inside the image, whereas everything from 229 and brighter is going to be clipped to white. Which includes nothing inside the image so far as the histogram is showing us here. Now, if you're ever curious whether the histogram is accurate or not, you can always update it by clicking on this little icon. And that will go ahead and give you more accurate histogram. In our case, it didn't really change the shape of the histogram at all. Now what I'd like to do is move this white triangle farther to the left so that we're brightening up more of the highlights inside the image.
So at this point with the values set to 198, anything with a Luminance level of 198 and brighter. Is now going to be white. And that does include a few pixels as we can see right there. Now one way to get a sense for the accuracy of your modification is of course to just subjectively evaluate the image there and in the image window. But an even better way to work is to bring out the Histogram panel. So I'll go up to the Window menu and choose the histogram command. And that brings up the panel. In my case over here on the right hand side of the screen. Now currently it's not as large as it could be, so I'll go ahead and click on the Flyout menu icon and use Expanded View in order to get a larger view of this histogram.
It also has some accuracy problems potentially. That's a function of Photoshop caching that histogram data which makes it possible to more quickly display the information. But I'm going to click on this little caching icon to update it like so. And I'm also going to switch from Colors to RGB. So that we're seeing analogous information between the Histogram panel and the Properties panel over here. Now you may wonder why the Properties panel is showing one histogram and the Histogram panel is showing something totally different. Well we're seeing the original version of the histogram, over here inside the Levels panel.
Whereas we're seeing the new updated version of the histogram, over here inside the Histogram panel. Notice that we've got some break between the lines? That tells us that we're missing luminance at this location. So in other words Look down here at this level information and the count right below it. And if I hover over this pretty big break right there, you can see that at a level of 82 our count is zero. Meaning that we no longer have any pixels with that particular luminance level. Meanwhile, we've got these big spikes where the luminance levels have been kind of jumbled together.
So at 146, for example, we've got more than 98,000 pixels that have been crammed into that area. So what that mean is we are creating a kind of destructive modification as we're applying the Levels command or any other color correction for that matter. The true advantage to working with an Adjustment layer here is that we can change the settings any time we like. And I think for my part, I'm going to go ahead and reduce that black point value to zero so that we don't have any black clipping going on at all.
But I will tell you this. You can also click inside these values and raise them from the keyboard. So I could press the Up arrow key to increase that value in increments of one. Or I can press Shift+Up arrow to increase that value in increments of 10. I'm going to go ahead and take it down by pressing Shift+Down arrow to reduce it in increments of 10 of course. And then I'm also going to click inside the Y point value and take it down a little bit more to 194 which I found worked very well for this image. You can check to make sure that you're not clipping too many pixels by clicking on this little Update button in order to refresh your histogram.
And you'll see clipped pixels on the far right side, in the case of anything that's been clipped away. So we have a little clipping, but not too much. And then if there's any clipping going on, on the black end, then you'll see a little line over here on the far left-hand side. And we're not really seeing any clipping at all in this case. So that's how you apply a custom modification using the black point and white point values. In the next movie, I'll show you how to work with the gamma value.
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