Sometimes it may happen that you may want to fix a mistake in the focus of a picture. This can be done in three ways, two with Photoshop and one with Gimp. I will explain them all, but be warned it won’t fix serious problems.
- Duplicate layer (Layer => Duplicate layer). Now you have two layers looking exactly the same. You’ll work on the top layer, been the original picture the background.
- Apply the “unsharp” filter (Filters => Sharpen => Unsharp Mask). Despite the name, what it does is sharpening the image according certain parameters you select.
- Regulate Amount, Radius, & Threshold.
- Save the image by exporting to your favourite (preferably JPEG). This will flatten merging the two layers into one picture.
- Duplicate layer (same as before).
- Convert the duplicated layer into a Smart Object (Layer => Smart Object => Convert).
- Apply High Pass filter (Filters => Others => High Pass Filter). Regulate the strength and accept.
- Be careful when set the radius, too much will make the image look odd. But don’t worry, if you make a mistake, just undo it and apply the filter again.
- Now the image look all grey but this is easy to be fixed, whether applying a Photo filter (Image => Photo filter) or setting High Pass to Overlay mode (see picture below). Additionally, you can regulate the opacity
- Export the image as explained before.
- Apply the sharpening filter (Filter => Enhance => Sharpen).
- Play with the controls at will. If you don’t like the result, just undo and start over.
- Export your image as JPEG (or other format) with the highest quality.
Yes, I did it on purpose. I left the easier an more effective for the end. Choose wisely.