High-Contrast Sketch
Combining the Find Edges filter and the Overlay blending mode can produce a high-contrast sketch effect that works with many types of images. This recipe includes multiple Overlay layers, which boost contrast, so the recipe works particularly well with low-contrast images. In the recipe, I use three Overlay layers—you can use more or fewer, though more than three can produce excessive contrast. Another variation, if the result is too harsh, is to add some Gaussian Blur.
1 In the Layers palette, duplicate the original image layer by dragging the background layer onto the "Create a new layer" icon, or use Ctrl/Cmd-J
2 Using the pull-down blending mode menu in the Layers palette, change the duplicate layer's blending mode to Overlay (or alternatively use the shortcut Alt/Opt-Shift-O) and rename it "Overlay 1."
3 Reduce the Overlay l layer's opacity to 6o%.
4 Apply Filter > Stylize > Find Edges to the
Overlay l layer.
5 Use Ctrl/Cmd-J to duplicate the Overlay l layer Name the new layer "Overlay 2."
6 Use Ctrl/Cmd-F to apply Filter > Stylize > Find Edges to the
Overlay 2 layer.
7 Repeat steps 5 and 6. An easy way to do this is to use Ctrl/Cmd-J followed by Ctrl/Cmd-F.
Direct contrast
This recipe always adds contrast to the image, which this early morning shot needed
Original image.
Overlay
Lock:
Overlay
Lock:
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Pictures with plenty of detail are naturally suited to the Find Edges filter 
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