You’ll see this term when you’re using some filters and tools, like the Fuzzy Select (Magic Wand) Tool. Threshold option in the Fuzzy Select tool options in GIMPĪ Threshold is a limit. Pixels that have more contrast (or more difference) than the Max Delta setting will not be blurred. The Selective Gaussian Blur filter will only blur portions of the photo that have less contrast than your Max Delta setting. In this case Max Delta means the Maximum Difference or maximum contrast. For example, the Selective Gaussian Blur filter has Max Delta as an option. You might encounter the term Max Delta when you’re using certain filters in GIMP. A white pixel next to a black pixel has a lot of contrast, but two middle gray pixels are less different, so we say they have less contrast. In GIMP, difference often means the contrast between pixels, since contrast can be described as the difference between light and dark. Max Delta option in the Selective Gaussian Blur filter in GIMPĪgain, sounds like it could be a complicated term, but Delta really just means difference. Adding an Alpha Channel to a layer turns on the layer’s ability to use transparent pixels.Īdd an Alpha Channel to a layer by right-clicking the layer thumbnail in the Layers Dialog, then choosing “Add Alpha Channel” from the list of options that pops up. For example, if you are working with a layer and the Layer Mask option is grayed out, or the Eraser Tool isn’t working properly, you may need to add an Alpha Channel to that layer.
Some functions in GIMP need to work with transparent pixels, and if your image or layer doesn’t have transparency enabled they won’t work properly. “Color to Alpha” really means “change color to transparency”. That pattern isn’t really in your image, that’s just GIMP’s way of letting you know those parts are “clear”.Īlpha sounds like a math term, but in GIMP it just means transparency.įor example, If you go to Colors > Color to Alpha you’ll be taken to a window that lets you change any color in the image to transparent pixels. What does Alpha mean? Alpha (transparency) in GIMP and other programs is represented by a gray checkerboard pattern. There are instructions for docking the Layers Dialog to the Toolbox window in Chapter Two of the How to GIMP book, and two troubleshooting videos on docking dialogs on this page under “Troubleshoot Docking Dialogs”.
I like to keep the Layers Dialog docked at the bottom of my toolbox so I can easily access it whenever I need it without hunting for a tiny floating window. Some of these dialogs can be docked (or attached) to other windows, like the Toolbox Window, making the dialogs and their options easily accessible when you need them. For example, the interface for dealing with Layers is called the Layers Dialog. You might the the term “dialog” in GIMP tutorials on YouTube or even read it in written GIMP tutorials.Ī dialog is a window that contains options and settings for a tool or function in GIMP.
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