Correcting a red over-saturated photo using Photoshop can be either very easy, or very hard. For example, if you have a photo that is completely red rather than just a little bit over the top, then I think you would basically have to desaturate the photo and recolor it from scratch – now this, you don’t want to do.
The easy case though, when you have a photo that is only tinted an abnormal red, this is nice and easy to fix. There’s a few ways to do it, but in this tutorial we’re going to be using some adjustment layers, mostly the Channel Mixer adjustment layers. 😀