Image Overlay

[mdg61313]

Is there a way to do this in Gimp ? I can figure out how this is done.

[Ofnuts]

Too late to go with much detail.

Two scripts of mine;

• ofn-truchet-path generates the truchet pattern as a path
  
• ofn-engraving takes an image and stroke a path with varying width according to the luminosity of an input layer
  

For instance:

Starting with this:

   

You generate the truchet path with ofn-truchet-path (rendered here for demo, but not necessary)

   

You generate the pattern of lines of varying thichness with ofn-engraving

   

You can then overlay this over the initial image

   

The engraving script generates lines that are wider where the image is dark (it is assumed you stroke dark lines). In you case you may have to use a color-inverted version of your image as a source since you want white lines that are wider where the image is light.

[sallyanne]

[attachment=8938]
I found that if you do you background pattern first (in this case it looks like a truchet). Then add your picture as a layer, last of all use the layer mode Grain Merge
or play with your layer modes and order of layers

[rickk]

You can also make creative use of any available "grid"   and gimp's  bucket-fill function if you first make sure that your face image and the  grid image are the same physical size. Following, ...the grid matrix is actually too large, but I used it to emphasize the technique.

The grid is actually from a seamless pattern that I cooked up, with transparent cells.  made an image  from that to suit the final image size. Copied the face image to load it into the clipboard,  selected the clipboard image in "patterns", set bucket fill to paint the pattern, and then painted the pattern carefully  on one wire with a high threshold setting, and then set the final product over the blue background. 

You can get a range of effects by trying several different settings for the threshold level as well as opacity of the bucket fill operation.  And once again, this particular mesh is too large, just for illustration purposes. This image actually looks better if you stand about 10 feet away from your screen   

[PixLab]

Go to Filters > G'MIC a window opens, go to Patterns > Truchet, make your truchet as you wish, (thickness, smoothness, background color and so)

   

Then just like @Sallyanne's nice trick ➤ play with blending mode (see below), duplicate the layer to amplify the effect as needed