'Digital Watercolour Technique '  Clive R. Haynes FRPS  | 
Make two duplicate copies of the Background Layer. These will become ‘Background Copy 1' and ‘Background Copy 2', as below         | 
  
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| To see what you're doing, turn off Background Copy 2 layer. | 
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Background Copy (1) Go to Filters > Blur > Gaussian Blur. Set to 1 or 2 pixels. Click ‘OK' Filter > Stylize > Find Edges > OK Desaturate – Quick Keys: Ctrl + Shift + U (or via: Image > Adjust > Desaturate) Set this Layer to 75% Opacity Choose ‘Overlay' Blend Mode (from the drop-down Blend mode menu – click on the ‘down arrow' to the right of the word ‘Normal' at the top left of the layers palette). See below:   | 
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Create a new (empty Layer) above Background Copy 1. Do this by clicking on the ‘New Layer' icon at the base of the Layers Palette (next to the ‘Trash' icon). See below.   | 
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| Name this Layer ‘Border Paint' (as above) | 
Choose a suitable brush (perhaps one with an artistic profile) and with White as the foreground colour, paint an artistic border around the picture area  | 
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Above: Appearance with brushstrokes added  |