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Here is an example enter image description here

The image isn't mine, I just grab the firs appeared to be good as an example of the topic issue.

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2  
On party photos, I would not be concerned about this... Unless someone pays you for this or you like wasting hours of retouching, this is not a required step. –  TFuto Feb 13 at 15:30
    
@TFuto I'm absolutely agree with you. This work will not worth the effort will be needed. But the OT was regarding spot removal, not the strategy :) –  Roman Matveev Feb 14 at 6:32
    
OK, see the generic and well working method in my answer below then. –  TFuto Feb 14 at 12:32

8 Answers 8

The solution was pretty straightforward. enter image description here

Covering the stain would work, but just using curves and applying them with a history brush in two modes, soft light and saturation removed the offending stains.

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That is really funny!!! :))))) –  Roman Matveev Feb 14 at 6:38

It's not particularly easy to remove entirely because where there are sweat stains there are also generally a lot of texture. I would probably try masking the area (making a layer that covers the area of the stain) and then use that mask to brighten the image up and make the stain less noticeable. I'd 'also probably feather the edges a bit to help blend it in as the wet spot tapers off.

It's still not going to be 100% perfect, but should make it less noticeable. It's also still a reasonably challenging thing to do a good job at without making either a dark ring or a light ring around the outside of the stain.

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What you need is the High Frequency Separation technique. Then you will be able to edit the sweat spot on the low resolution image very easily, basically a color replacement, and keep the textures of the T-shirt. You just have to select the proper filter frequency (or pixel blur, in other words, in the described technique).

Do not forget to increase the color bit depth to 16 bit when you start, otherwise you will quickly see color banding.

The other way is just to paint over. With a bit of skill, you can do it with a mouse (... well, I can do it, so you can, too ;-), although a tablet and pen makes this easier (or harder, depending on your skills...).

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+1 for the freq sep, but there's no good reason to go to 16-bit unless you are adjusting gradients (that is, doing calculations on existing pixel values). In this case, simple cloning or painting with a soft brush on the low frequency layer (or, rather, on a new layer above the LF layer but below the HF layer) will suffice, and there's no reason to worry about banding/posterizing. –  user2719 Mar 3 at 8:30

You could try a brush with a little exposure compensation which will lighten up the dark patches because the moisture is only darkening those colours.

You won't get it all out without lots of work but it will make a lot of difference.

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Are you talking about "Lighter color" brush mode? I did not find any "exposure compensation" mode of the brush tool (PS CC) –  Roman Matveev Feb 14 at 6:35

Will depend on the size and texture of the Stain, either of dodge and burn, exposure brush or layer mask might work, but we'll take efforts and precision.

In case of smaller spots, even spot healing gives decent results.

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You're also talking about "exposure brush". Is it any kind of Photoshop tool? I did not find such Brush tool mode... –  Roman Matveev Feb 14 at 6:37
    
Adjustment brush, select exposure –  SKocheta Feb 14 at 10:22

Healing brush may work very well in this case.

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Good suggestion. How would someone inexperienced with this tool go about it? –  mattdm Feb 13 at 21:05

maybe the "dodge and burn" technique can help for a quick and dirty solution (especially the dodge part of it :-) ). As you probably wont be able to make the stains disappear entirely, you can save yourself some time and try simple but still (maybe) effective ways.

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You can use the clone tool and set its hardness at a low level to avoid the editing being obvious, but you will have to be very precise. So yes, but depending on the position of sweatspots you may not always be able to use this method.

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