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Home - Photo Tips - Techniques - High Quality Sharpness With High Pass Filter (Photoshop)
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High Quality Sharpness With High Pass Filter (Photoshop)
We've already told you how to sharpen image details with the help of History Brush and how to sharpen a large number of photos quickly .
Now let's speak about one of the most popular methods of sharpening images. It's as simple, as universal: you may apply it both to small pictures for web and to large files for printing.
High Pass filter
operates in the following way: monotonous areas become gray, and in the
areas where the colors are mixed the gray tone becomes brighter (if the
original tone is bright) or darker (if the original tone is dark). So
High Pass makes very contrasting edges.
We admit that you've already done all the needed correction as white balance ,
contrast, color correction and so on, and the only thing remains -
sharpness. High Pass can really make your photo sharp only in the areas
you need without showing any noise or grain.
1. Duplicate the layer. Layer -> Duplicate layer... (Ctrl+J)
2. Remove the color. Image -> Adjustment -> Desaturate (Ctrl+Shift+U). This step can be missed, though it gives a bit higher quality.
3. Apply the filter. Filter -> Other -> High Pass...
Setting Radius value depends on your purpose. If you work with the
image for web set 0.3-0.5 px, if you are going to print it, set 1-2 px.
4. Choose the blend mode to Overlay. You may use also Soft Light or Hard Light with opacity changing.
5. If you think that the effect is not sufficient, duplicate this layer as many times as you want. Be aware of going too far.
Tips and Hints:
- If you post process your image for web, first resize it and then do the sharpness.
- If you post process your image for printing, open the preview to 100% and watch the difference at the most obvious area.
- Don't forget that the sharp effect increases with the duplicating of the layer but not with the higher Radius value.
You are welcome to share your experience on our photo forum!
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