Sharpening your images
The other day I came across an article on the internet about sharpening your image in a safer way in stat of using Unsharp Mak.
One reason for this is that the Unsharp mask operates on the actual image pixels and it makes changes to those pixels. This sharpening process that makes use of the High Pass filter doesn’t operate on the original image so it does not destroy the image pixels.
This is how it works:
1. Open an image and duplicate the background layer of the image. If your image has multiple layers, add a new layer at the top of the layer stack, click it to select it and press Ctrl + Alt + Shift + E (Command + Option + Shift + E on the Mac) to fill the top layer with a flattened version of the image – without affecting the other layers.
2. In the Layers palette set the blend mode of the new top layer to Overlay. This will let you see the sharpening results in place on the image in the next step.
3. With the topmost layer still selected, choose Filter > Other > High Pass. This filter has one slider to adjust the Radius value. Drag the slider until you see a pretty much gray image in the preview window with the only detail being around the edges of objects in the image. If you can see color in the preview image then the radius is set too high. Typically a Radius value of well under 10 pixels should be sufficient – we used 2. Click Ok.
4. The image is now sharpened – check the original against the sharpened version by clicking the Layer Visibility Icon for the top layer on and off to compare the result.
To finish the effect, adjust the Opacity of the top layer to 0 and then move it back up stopping when you have a good sharpening result. The ideal Opacity will depend on your personal preference.
If desired you can use blend modes other than Overlay, for example Soft Light and Hard Light can be equally as effective depending on the result that you are looking for.
If you are using Photoshop CS3 or CS4, before you apply the High Pass filter to the top layer of the image, convert it to a Smart Object by selecting the layer and choose Filter > Convert for Smart Filters. Then apply the High Pass filter to the new smart object in the same way as I have outlined above. When you apply a filter to a Smart Object you can return later on to edit it – simply double click the filter name in the layer palette and the filter dialog opens allowing you to change the Radius value.
My source of this knowledge is:
I hope you found this useful.
Photo credits: Antoinettew.