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This option creates transparent or semi-transparent pixels that fall on the boundary line between the opaque and transparent regions. They allow you to remove the remaining solid pixels of the old color near the edges of the opaque regions. Equally useful are the refine edges and smooth edges options. In other words, you can simply click on areas of the input and they will disappear in the output. When you click on any JPG/JPEG pixel in the preview, its color is read and substituted in the "transparent-color" option in RGB code format. If you don't know the name of the color you want to make transparent, you can select it directly in the input preview. To make sure that the right regions are matching, you can use the Show Transparent Pixels option that will make the transparent regions black. If you enter 0% in the option, then only one color will be made transparent, but if you enter something like 10% or 20%, then many more color tones will be made transparent. There's also an option that will make it match similar colors. Once you load your JPG/JPEG, you can select the color that will be made transparent.
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This online tool creates a transparent JPG/JPEG picture.
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