![]() CSS-ready colour codes for HTML, PHP and other web-pages.Text tool for evaluating the readability of the selected font and background colour combinations.Gradient transition between any two colours for creating a wide range of in-between hues.RGB, HSV and HSL colour editors for adjusting and editing colours.Red-Green-Blue (RGB), Cyan-Magenta-Yellow (CMY) and Red-Yellow-Blue (RYB) colour wheels with marked triads and complementary colours.Conversion of Hexadecimal and RGB colour codes into the corresponding colours.User comments and notes for picked colours.Interaction with the standard Windows and macOS colour dialogs.aco colour swatches (Adobe color files) and GIMP. Ability to open, edit and save Adobe Photoshop.Colour list for saving, cataloguing and re-using the picked colours.Calculation of pixel distance between points.Point lock feature for monitoring the colour in the set screen location independent of the mouse cursor position.Screen freeze feature for sampling the colour of the elements that change on mouse-hover.3x, 9x and 15x magnifier and keyboard control of the mouse cursor movements for greater precision.Averaged colour sampling for easy colour noise handling.Extensive range of colour code formats: HEX, RGB, HSB/HSV, HSL, HWB, CMY, CMYK and TColor.Now create a New Layer (have Foreground set to Red when you do this). There should now be a nice green and alpha image with no trace of the blue left. Click OK after the color indicator on the Color To Alpha plug-in is changed to blue. ![]() If using Gimp for Windows, you’ll have to right-click on the destination button and select the Foreground - drag n’ drop doesn’t work. Click, hold, and drag from the color portion of this window to the color portion of the Color To Alpha plug-in. When you used the color picker to select the background, a window with the color popped up. Next use the Color Picker Tool to select the background color. If its not there, upgrade your gimp to 1.2.x. If its grayed-out, it means that you have an indexed image. Its menu location is Filters -> Colors -> Color To Alpha, where means to right click on the image. The first step is to activate the color to alpha plug-in. Instead, may I suggest the rest of the tutorial? Step 1 ¶ You can go too far, and blend it back to something close, but this is time consuming. Anything short of the rightmost image has some blue in the pixel, which will stick out. You can spend hours trying to find something that will work perfectly, but you won’t. ![]() You can try getting rid of all the ugly pixels, but then you’ll end up with something jagged like on the right. The middle one is close, but there are some ugly visible pixels still. This looks somewhat neat, but not what we’re going for. The left one has a blue border around it. When these are filled, we are left with flat black and slightly blueish-green pixels between them, or no transition to black at all.Ĭompare each with the target image below. You’ll note that each of the three zoomed in selections above have varying amounts of the green-blue mix selected. However, when removing an anti-aliased object from its background is not a good idea, as shown above. The common approach to doing many things in GIMP is to first get a good selection. This tutorial doesn’t address the complexities of handling real-world photos in this manner, but does briefly discuss it at the end. To illustrate this, this tutorial will use the above images as source and destination. The aim is to show the advantages of using the color to alpha plug-in over selection-based techniques. This tutorial shows you how you can efficiently replace the background of an image with another in GIMP, through the use of the color to alpha plug-in. Text and images Copyright (C) 2002 Seth Burgess and may not be used without permission of the author.
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