![]() It is easy to identify a color cast in LAB mode. Now you can take what you just learned and see how to identify and fix color casts easily in LAB. If you are still with me thus far, everything will be easy from here. This will be important for identifying and correcting color casts. As you move to the right towards +127, the colors get more yellow.Īlso note that the center line of the histogram runs right through the zero in the center of both the A and B channels. But, as you move to the left on the histogram towards -128, the colors get bluer. In the B channel you still have a starting middle point of zero, which is also gray. It works exactly the same way in the B channel, only the colors are different. To the right, you move into positive numbers (toward a max of +127) and things get more magenta (pinkish). To the left, the numbers go into negatives (all the way down to -128) and things get more green. As you move away from the zero (gray) point in the middle, more color is added. The middle of the histogram is a gray tone without any real color. Conversely, the further to the right you are in the histogram, the more magenta is present (see diagram above). The further to the left you are in the histogram, the more green is present. The A channel is a combination of green and magenta. Now let’s look at the histogram of the A channel more closely so that you can see how this works. As you saw in the last article, this empty space is what gives us the opportunity to enhance color so effectively in the LAB colorspace. Because LAB is such a ridiculously broad color space, there will be a lot of empty space on either side of the histogram. The histogram in both of these channels almost always looks like a spike in the middle of the histogram. The B channel consists of blues and yellows. The A channel consists of greens and magentas. All color in the LAB colorspace is within the A and B channel. The L channel strictly controls lightness and we won’t be working with it for purposes of this article. LAB stands for Lightness, A channel, and B channel. Once you understand how LAB works, everything else will be easy. Removing color casts and manipulating color will be simple for you once you know a little bit about how LAB color works, so first let’s make sure you understand what is going on in the LAB colorspace. In many ways doing this in LAB is simpler and more powerful than doing it in your normal color space (RGB). Specifically, I will show you how to remove an unwanted color cast from your photos using LAB. Whereas in the last article we simply used the basic LAB color move to enhance color, now we will get into color manipulation. In this article we are going to build on that a little bit. Hopefully that gave you an idea of the power of the LAB colorspace to manipulate color in Photoshop. In a recent article about the LAB colorspace, I covered the basic LAB move to enhance colors.
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