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1

From that page, there is a link to a contrast calculator And looking at the source, we can generalize: RsRGB = Red Component / 255 GsRGB = Green Component / 255 BsRGB = Blue Component / 255 Calculate luminance R = is (RsRGB <= 0.03928) then RsRGB/12.92 otherwise ((RsRGB + 0.055)/1.055)^2.4 G = is (GsRGB <= 0.03928) then GsRGB/12.92 otherwise ...


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When you put the pavement image in a new layer above the red background, I would try to do some smoothing first to make the colors more consistent. Additionally, your image is of very bad quality and you should try to use a better image of a similar pavement. When you think the quality of your image is OK, convert it into gray or black/white by thresholding ...


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Put the Brick layer above the Red layer and choose and set the layer to Multiply


0

Place the paving stones layer above the red layer and apply a layer blending mode to the stones. Experiment until you get the effect you're after. When you select a layer, the blend mode is available in a drop down menu toward the top of the layers panel.



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