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What is a "Gradient" in an Image?

A gradient is an effect in an image that occurs when a color gradually becomes another color. There are various types of gradients according to their shape, e.g. a simple linear gradient, a circular radial gradient, etc. In image editors, we typically define a starting and ending position for the gradient and we can choose what occurs to the gradient after that point, e.g. the gradient stops at the extremes, or repeats, or repeats but inverting the starting color and ending color.

Gallery

A dialog window titled "New Filter Layer - Krita." It has two panes: on the left a list of filter categories, in it "Map" is expanded with the follow items: Gradient Map (selected), Normalize, Palettize, Phong Bumpmap, Round Corners. In the main pane, the top row of widgets: "Default" (a dropdown list button), Use last preset (unchecked), Edit Presets (button), XML (button). Then two tabs: Gradient Colors (active), color mode. In the gradient colors tab, various rows of widgets. The first: a plus button, a save button, a button that reads "Convert to Segment Gradient," a button with a down arrow that reads "Choose Gradient Preset." And an icon that is three horizontal lines. A textbox labelled "Name" (value: Blue to Red). A complex widget to edit the gradient, showing a blue to red gradient. A left and right arrow icons, next to the "Stop #1" label, a trash can icon, an icon that appears to mean mirroring, an icon that is a graysale gradient with an right arrow under it, an icon that is a rainbow gradient with a right arrow under it, an icon that is two small rectangles. Under a large rectangle with a red and blue gradient, two control points that are tear-shaped, the left one is blue, the right one is red. Below, two icons that appear to change the order of squares, a wheel, a button to pick a color (blue is selected), a box to change the opacity (100% is selected), and a box to change the position (0% is selected). At the bottom of the dialog, two buttons: cancel and OK.
The Gradient Map filter settings in the New Filter Layer dialog in Krita. It displays a gradient with two colors (two stops): blue and red, so the gradient goes from blue to red.
A non-destructive gradient halftone effect created in Krita.
A non-destructive gradient halftone effect created in Krita.
A metal gradient text effect in Krita, next to its layer styles dialog. In it drop shadow, gradient overlay, and stroke effects are activated. A second dialog, "Custom Segmented Gradient," is open displaying the stops of the gradient being used.
Example gradient settings for a metallic text effect made in Krita. Observe that it has several stops.
Written by Noel Santos.

About the Author

I'm a self-taught Brazilian programmer graduated in IT from a FATEC. In a world of increasingly complex and essential computers, I decided to use my technical expertise in hardware, desktop applications, and web technologies to create an informative resource to make PC's easier to understand.

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