I am following Tom Patterson's Landsat 8 Photoshop tutorial. After I merge the RGB channels and adjust the curves in Photoshop, I notice a lot of color artifacts in the image (blue, red, and purple specs throughout). I downloaded Landsat 8 OLI/TIRS C1 Level-2 images from Earth Explorer (USGS).
Does anyone know why this may be happening? I'm trying to achieve a nice, natural color. I plan to merge several images together and use them within Natural Scene Designer.