It's going to happen: people sweat, and sometimes, they do it enough that it leaves a stain on their clothing. When that happens, you'll be glad you learned this technique for removing sweat stains using Photoshop.
Coming to you from Unmesh Dinda of PiXimperfect, this helpful tutorial will show you how to remove sweat stains on clothing using Photoshop. Whether you're shooting weddings, events, or the like, it's not an uncommon problem to find that by the end of a day of dancing or simply being in a hot environment, some people will have sweat stains. Fortunately, it's not particularly difficult to completely get rid of the offending stain using Photoshop. An additional tip is that when you're selecting the initial color range using the color picker in the hue/saturation dialog box, change the sample size from point sample to 3 by 3 or 5 by 5 average. This will help to ensure that your color range isn't thrown off if you happen to select a white fiber in the shirt or the like.
While the process might seem a bit involved while you're learning it, it goes very quickly in practice. Check out the video above for the full rundown.