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Threshold levels

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  • 2 weeks later...

What you're trying to do actually can be accomplished quite simply by using Layer->Adjustments->Levels and changing the input black point. This can be changed by adjusting the bottom value of the left-side gradiant bar. This will modify the other pixels of the image, but I think you'll find that the result will look nicer. The contrast of the image will be improved, and the colors will be slightly brighter.

If you find that you do not like the increased contrast provided by this effect, you can set your output black point to match your input black point. This will accomplish something very similar to what you described--it will remove the near-black noise without modifying the other pixels. The catch with this method, however, is that it will not result in a dark black in the output image. For that reason, I'd recommend you stick with method #1.

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