Setting the Threshold option higher means the range of colors is less limited, so the selection will include a broader range of less similar colors. Setting the Threshold option for the Fuzzy Select Tool to a very low number limits the selection to very similar colors. You’ll see this term when you’re using some filters and tools, like the Fuzzy Select (Magic Wand) Tool.The Threshold setting for a tool or filter is usually the limit at which the tool or filter will no longer take effect.įor example, the Fuzzy Select Tool selects regions of a photo or image that have similar colors. 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. You might encounter the term Max Delta when you’re using certain filters in GIMP, for example the Selective Gaussian Blur filter. 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. Again, sounds like it could be a complicated term, but Delta really just means difference.In GIMP, difference often means the contrast between pixels, since contrast can be described as the difference between light and dark.Adding an Alpha Channel to a layer turns on the layer’s ability to use transparent pixels. 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. “Color to Alpha” really means “change color to transparency”. Alpha sounds like a math term, but in GIMP it just means transparency.For 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.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.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”. A dialog is a window that contains options and settings for a tool or function in GIMP.I’ve listed a few below, and remember there is a Glossary at the end of the How to GIMP book to help you with even more GIMP and photography terms. Thankfully, these complicated sounding words usually have pretty simple meanings. There are some terms and tool options in GIMP that you may not be able to figure out at first glance. I’ll explain some of GIMP’s technical terms in plain English, I’ll cover some of the more common but frustrating problems you might encounter while using GIMP (good news- they’re super easy to fix!), and I’ll cover some common How To questions that will help make your first days of using GIMP a little easier.Ĭlick on a link below to reveal more information without leaving this page. Many of these quirks and questions are addressed on this page. As you use GIMP, you may have some questions about what a term means, what a tool does, why a tool won’t work as expected, or how to preform really basic tasks like drawing a straight line. When Things Aren’t Working You Need GIMP HelpĮvery new GIMP user will need GIMP help at some point.
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