Always make a copy of your original image before adding special effects.
Quick tip
To make a copy of your photo before you start post processing use the Duplicate option located on the toolbar under Photos or by selecting Cmd+D.
But iPhoto won’t let me click ‘duplicate’
Making a copy of an image can sometimes seem tricky as the Duplicate option isn’t always ‘clickable’. This is because you can’t perform this action when you select an image from a Smart Album.
I recently discovered this after I sorted all my photos into various Smart Albums. Using Smart Albums is an excellent way to organise photos, but because it’s not a real album (they are based on criteria you specify such as keywords) some options are not available to use.
So, if you find you can’t duplicate an image make sure you are not in a Smart Album. Simply browse to the image from a regular album or from the Photo Library option.
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