adjacent color tones in a Portable Network Graphics (PNG) photo or image. To match comparable color tones, provide a percentage of similarity in the options. By default, 30% comparable color tones are matched, however this may be changed as desired. If the color being removed is red, for example, it will also remove cherry-red, rose-red, wine-red, and similar shades of red. If you remove the color but the image's edges retain a pixel or two of the original color, you may refine and smooth the edges by checking the "Smooth Edges" option. This option renders the pixels on the opacity-transparency border semi-transparent. Increase the smoothness radius to eliminate additional pixels from the borders and improve the clarity of the PNG. Additionally, you may click on the input PNG interactively to rapidly delete any color and its tones. For instance, if you click on a green pixel, all adjacent greenish pixels become translucent. This way, you don't need to know the name or code of the transparent color; you can just click on the color in the PNG to make it translucent. Png-abulous!
