Camera shake happens when the camera moves during the exposure, causing your picture to be blurred. The faster your shutter speed, the shorter exposure and the less chance there is of camera shake – but sometimes you only find out when it's too late.
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• 15 common photo fixes
With the coronavirus sweeping the globe, we imagine that many of you, like us, are now working from home and looking for new ways to pass the time, so we thought this would be a good time to look at common photo fixes and how to bring past photographic failures back to life again!
In this instalment we'll show you what you can do with images that show signs of camera shake. As with focus errors, there are no magic cures, but as long as the shake isn't too bad you can often get a considerable improvement that makes the difference between a photo you can't use and one that you can.
Photoshop Shake Reduction command
As with out-of-focus shots, there is only so much you can do with photos afflicted by camera shake. Photoshop offers a dedicated Shake Reduction command (Filter > Sharpen > Shake Reduction) that helps to combat slight shake by detecting the angle of blur and re-aligning shaky pixels.
You can leave this tool to do its work automatically, or you can use the Advanced options to select the area for shake analysis and adjust the angle of the blur movement if necessary.
The Shake Reduction filter will be applied to the whole image, which can add artefacts to areas which are naturally blurred, so to get round this you can duplicate the image layer first and then use a layer mask to remove the effect where it's not needed.
Shake Reduction: A Photoshop tool which analyses images with camera shake to determine the direction of the blur, and then applies a specialised anti-blur process that's much more effective than regular sharpening.
Layer mask: This is like a selection that's saved permanently alongside an image layer as a greyscale image. Black areas on the layer mask hide those regions of the image layer, white areas show those areas and grey areas show the layer with partial transparency.
Next instalment: #6 My horizon is wonky!
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