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Full black, and full white, will neither take a colour. The screen shot below shows a Hue/Sat layer set to Colorize, and with the saturation slider moved all the way right, the white has become slightly pink, but the black is still black. Note I have masked out half the Hue/Sat layer to demonstrate the before and after.
If I move the Lightness slider half way to the right, to make the black become grey, it takes the colour.
Similarly, moving the lightness slider half way to the left, to darken t
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In Raster images when it come to colors it is usual to seen feathering and anti-aliasing where there are color transitions. So you neet to take the into consideration. Here I have a simple BW graphic. I set the magic want to point sample no anti-alias not contiguous tolerance 1 and sampled a black pixel RGB 000000. To select to select all 100% black pixels. I added an empty layer and filled the selection with red pixels RGB FF0000, Deselect and zoomed in 800% So you can see the feathered and anti-alias areas that were not selected. No quality was lost. The background layer is intact and not changed but In You opinion has black been made Red?
Full black, and full white, will neither take a colour. The screen shot below shows a Hue/Sat layer set to Colorize, and with the saturation slider moved all the way right, the white has become slightly pink, but the black is still black. Note I have masked out half the Hue/Sat layer to demonstrate the before and after.
If I move the Lightness slider half way to the right, to make the black become grey, it takes the colour.
Similarly, moving the lightness slider half way to the left, to darken the white to grey, it takes on the red.
This white to black gradient demonstrates how it works. 50% grey takes the colour best fading out the nearer it gets to full black, or full white.
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