In Photoshop there are three main thresholds of light: highlights, shadows, and mid-tones. We can’t just have two extremes of light and dark, we need a middle ground that is the defining point of how far we have to travel with the light to reach those extremes, hence the mid-tones. With that understanding, there are three colors that represent these luminosity values in Photoshop: white, black, and gray. Gray is the defining mid-point between these two extreme colors, specifically 50% gray which is the perfect middle ground between black and white. So let’s look at some examples of how these three colors (that represent values of light) interact with an image from each of the sections mentioned. First, we’ll start with this image of Stephanie. I’ve added a layer above the image that has a circle made of black, white, and 50% gray. This new layer is on a Normal Blending Mode; therefore, we see all three circles/colors without any changes.
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