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The foreground image is a black and white and set to "Multiply". I want all the dark hues to be replaced with whites.

enter image description here

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  • Hawoabout Invert image?
    – joojaa
    Commented Oct 8, 2017 at 14:41
  • 1
    You mean like this image?
    – joojaa
    Commented Oct 8, 2017 at 14:45

2 Answers 2

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  1. Highlight the image layer
  2. Choose Image > Adjustments > Invert from the menu
  3. Change the layer Blending mode to Screen
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Actually it's nor clear what is wanted, so I place some guesses.If you want darker shades more in BW and less in red, you can put your image to the layer mask of the red layer. On the top there's the multiplying original BW image.

Here the leftmost image is the assumed original image and the red one is the result. If you want a steep treshold, you can treshold the layer mask.

enter image description here

You can directly edit the layer mask by clicking at first its icon. To be able to paste something into the mask, click the icon holding Alt at the same time. Use paste in place, if you want to get exact placement.

If you literally want to change everything darker than a known limit to white, you have several possiblities. One way is to add a white layer which is masked by the inverted original image. The steepness of the whitening can be adjusted by adjusting the levels of the mask.

enter image description here

Here the curves tool is applied to the layer mask of the white.

The guessing goes on. Here the blacks are turned to white, all dark is now light red. The inverted original BW image is colorized to red:

enter image description here

This is not a guess or at least it's not my guess. It's suggested by user @joojaa in a comment:

enter image description here

The BW image is used as a layer mask for red. Black reveals underlying white fully, greys make red partially transparent.

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    Hide the roiginal multiply in last image
    – joojaa
    Commented Oct 8, 2017 at 18:18
  • @joojaa Why - it will change nearly black to light red, I tried to change dark shades to light grey.
    – user82991
    Commented Oct 8, 2017 at 18:31
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    You are tainting the white with black color getting you that interesting gayish tint
    – joojaa
    Commented Oct 8, 2017 at 18:42
  • @joojaa I'll do it later (=as soon as I get my own guess list ready)
    – user82991
    Commented Oct 8, 2017 at 18:55

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