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Hi i have this layer :

enter image description here

And this layer :

enter image description here

And what i want to do is add those black lines to the red layer but i dont want the white parts , how can i do this ?

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3 Answers 3

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 and you get something like this:

enter image description here

Now got to the Layer window and choose negative multiply as mode and adjust the level of the mixture as you like it. Your result will something like this

enter image description here

which is hopefully the result you wanted. Btw, when you want the edges to be black, you just have to invert the edge image:

enter image description here

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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.

enter image description here

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And is there a way to make white or black parts transparents on a layer ? –  Maks Mar 31 at 23:22
    
Blend modes will essentially achieve selective transparency for you. For instance, #ffffff will render as transparent when the blend mode is set to multiply. Play around and you'll see what I mean. –  plainclothes Mar 31 at 23:25
    
Actually, I should amend that last statement: White does not become transparent in multiply mode, it just won't change underlying color. –  plainclothes Mar 31 at 23:28

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

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