Tanel Posted January 15, 2008 Share Posted January 15, 2008 (edited) This plugin extracts a color range from image, by leaving pixels of selected color opaque and making the rest transparent. Only alpha values are altered, color remains intact. It is useful if you need to edit certain colors on your image separately: duplicate the image layer and run the plugin to get color-based "selection" for further editing. It is more flexible than Magic Wand or Curves+ which could provide similar results but not always exactly as needed. Menu location: Effects > Photo. Download as part of my plugin pack. Updated to version 2.2 (2008-12-24)! Changes: few UI and code optimizations; moved to Color submenu. Updated to version 2.1 (2008-08-31)! - Compatibility fix for paint.net 3.36 Changes in v2 (2008-01-23): - Effect is now located in Adjustments menu - Added check box "Override Original Alpha" (see details below) - Few minor bugfixes Use the six color controls (on top) to define your color selection, and three adjustment controls (on bottom) to adjust the output. For ease of use, the default color range is defined around primary color. So I suggest to use color picker tool before starting the plugin. Check box near each color control defines whether you restrict color by this parameter or not. Unchecking equals to selecting the full range. Tolerance control makes alpha to fade off gradually, based on color's similarity to selected color. Max tolerance makes full alpha gradient from selected color to it's opposite (for example from full bright to full dark, if brightness from 255 to 255 is selected). Feather control softens edges by blurring alpha channel by selected radius. I recommended to adjust this after all other controls are set, due to heavy impact on processing speed. Base Opacity control adjusts alpha of "non-selected" color. Invert Alpha check box inverts final alpha. Override Original Alpha check box controls how to handle originally transparent/semitransparent pixels: - unchecked (default) -> transparent pixels remain transparent, even if pixel's color match your selected color - checked -> transparent pixels turn opaque if pixel's color match your selected color Reset button returns to default setting (that is: color range from primary color and other controls zero). Note: greyscale pixels are also treated as color, defined by Hue=0, Saturation=0. Example: here I attempted to extract skin tones from the photo. I started with color picker tool and clicked in the middle of his raised arm to get a good color sample. Then opened the plugin, adjusted the color range a bit, finally feathered by amount of 4. Screenshot: You can learn the behaviour of this plugin on my test image, containing hue, saturation and brightness gradients: link. Tip: Feather, Base Opacity and Invert Alpha can be also used independently from color controls (with unchecked Hue/Sat/Brigh); so you may find alternative uses: - Feather - Base Opacity: to "un-erase" erased areas - Invert Alpha: to invert opacity Enjoy! Edited November 26, 2018 by toe_head2001 Restored images Quote Link to comment Share on other sites More sharing options...
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