Creating custom brushes

The most important thing to remember when building a file to use as a brush preset is that brush tips operate using the principles of grayscale. Simply put, this means that wherever you have a solid black area, 100% paint will be applied when you use this image as your brush preset. Inversely, areas of white will deposit no paint at all, and areas of grayscale will fall into place in-between, dependant upon the amount of black in those particular areas.

9 I After adding the scratches layer to the skull file, repeat the process of selecting the dark areas of the background layer with the magic wand. Use the same method and tool options that you used earlier in the gas mask file. Then, on a series of layers paint some lighten and darken areas with the brush tool. Again use the same methods, tools and tool options as before. Deactivate your selection and then shift-drag the rust texture layer from the gas mask file into your new file. Reposition the layer as required within the skull file.

10 I Open up the spatter.jpg file again and shift-drag it into the skull working file with the move tool to add it as a new layer. Reduce the opacity of the new layer to see the art beneath. As you did previously with the gas mask file, use the polygonal lasso to create a rough selection border and then add a layer mask that hides the contents of the selection. Use a large, soft, round brush with a black foreground color to paint over the hard edges on that layer within the mask to remove them. When you're finished editing the mask, target the layer instead of the mask, and change the layer opacity to 80%.

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