Removing Moire Effectively - Page 10

In this example, we will use the “b” channel of the copy and do some blending into the original file. If you haven’t used “Overlay”, “Soft Light” or “Hard Light” blending you may want to read up further on how these modes work. In short, Overlay blending mode looks at the tone in the source file and makes the follow calculation: if the density is 50%, then make no change to the density of the destination file. If the density is less than 50%, then lighten the destination file and if it is greater than 50%, then darken the darken the destination file.

Under the “Image” menu there is the command “Apply Image”. In the “Source” drop-down box, select the file name that corresponds to your copy created at the beginning of this exercise. Since we determined that the “b” channel was going to be our channel of choice, select it in the “Channel” drop-down. The target should read the name of the file that has no color moiré. Notice that “Lightness” appears next to that name since we have only the “Lightness” channel selected.

For the blending mode, we have three choices that will all produce results along the same vein. Depending on the nature of your particular image, you may need to try all three and view the results. For this image, “Hard Light” was most effective.

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