![]() I can also use the arrows on the right side of the opacity slider (denoted by the red arrow) to increase or decrease the opacity by 1 percentage point. If my layer is 40% transparent, then the opacity must have been set to 60%. So, if my opacity for my layer is set to 65%, my layer is 35% transparent. On this note, I’d like to point out that there is an inverse relationship between opacity and transparency – or in other words the value of one of these measurements is always the value of the other measurement subtracted from 100. For example, I’ll type 23 to set my opacity value to 23% and my transparency value to 77% (as shown in the area highlighted in green in the photo above). To do this, I just need to use my mouse to highlight the current value (it is set to 50.0 right now), then type my new number and hit the enter key. I can also manually type in a value in my opacity slider if I want a precise number here. This is why we can somewhat see through this layer, revealing the white background behind it (which consequently makes our image look a bit lighter, since adding white to all your pixels will lighten those pixels up). If I drag the slider until it reaches a value of 50 (as demonstrated in the photo), that means the image layer now is 50% opaque and 50% transparent. ![]() If I drag the slider to the left, the number becomes less than 100, which means the image layer now contains a percentage of transparency. By default, the slider is set to 100 – which means it has 100% opacity or is totally opaque. For example, if I click on the Model in Red Chair layer (denoted by the green arrow), I can use the opacity slider at the top of the Layers panel (red arrow) to adjust the overall opacity of this layer. There are a couple of ways to tinker with the transparency of a layer, with the results depending on how you are interacting with a layer’s transparency. Adjusting Layer Transparency with the Opacity Slider This layer also does not contain transparency. The third layer is our Background layer, which is also totally opaque but is filled with the color white. The second layer is an image – titled “Model in Red Chair,” which is totally opaque and does not contain transparency (more on that in a second). ![]() The first layer is Layer 1 – which is at the top of my layer stack and is a totally transparent layer. To better understand this concept of transparency, I have three layers open in my composition (highlighted in green in the photo above). This is an important concept because transparent layers allow designs to be more intricate and contain more depth, and also allow compositions to be saved without backgrounds. As has already been discussed briefly in this series, layers can contain transparency to a varying degree, or they can be totally opaque. ![]()
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