On Mon, 26 Nov 2007 03:59:23 -0500 Lea Wiemann <[EMAIL PROTECTED]> wrote:
> Hi, > > I'd like to turn a black background into white, or transparency (in > which case it should look cut if displayed on a white background). My > practical use case is photos of objects with black backgrounds that I'd > like to improve for Wikipedia. The problem is that the boundary between > background and object is usually fuzzy. > > I've created a pair of example images (attached): Say I start off with > the image fuzzy-circle.png (a gray-patterned circle on a black > background); what I would like to get is something like > fuzzy-circle-goal.png (the gray-patterned circle on a white background) > -- but that seems pretty hard to achieve: If I "select by color: black" > and then cut the selection, the corners look either aliased/"too sharp" > (for high thresholds in the select-by-color tool), or they have dark > pixels in them (for low thresholds). Selecting the black background, > growing the selection (2px), feathering it (2px), and then cutting the > selection *kinda* works, but it cuts off the blurry part of the object > boundary. > > Any ideas on this one? If you are using 2.4, Colours->Colour to alpha or in 2.2 Filters->Colours->Colour to alpha After that, make a new layer and fill with whatever colour you want Owen _______________________________________________ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
