In this lesson for Photos on the Mac, I cover how to adjust the look of a photo in the Photos app. Adjustments include changing contrast, saturation, and/or color in the photo. I show you where to locate the “Adjustment Tool” in the “Edit” menu, then demonstrate how to add and remove adjustments in a photo. I review the four basic adjustment tools (histogram, light, color, and black & white) and briefly cover a more advanced adjustment tool, “Vignette.”