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Alex pretty much nailed it. When GIMP looks at your image internally all it sees is one layer containing a bunch of RGB values -- it literally has no way to recognize which pixels are intended to be "foreground" and which ones are "background". It is, unfortunately, your job to make that distinction for GIMP and separate foreground from background, otherwise any attempt to adjust the image will (in fact it's required to) affect all pixels in the image layer. So you'll need to use and combine various selection tools to "draw a line" (almost literally) between foreground and background. Then you can perform operations on just one or the other.
Another alternative is, somewhat ironically, if can simply go back and take another photo of the same items set against a black surface instead of a white one - this will make it a lot easier to tell which is which. As it stands, if you used say a fuzzy select (which uses an automated edge-detection system) on the whole image then GIMP will actually clip off the tops of the jewelry because in that location the photo is slightly overexposed (all pixels fade out to solid white around the tops of the beads, there literally is no detail for the fuzzy selector to pick up) and GIMP can't tell where the top of the beads are. You'll probably have to mix in an elliptical select or two to make it clear. So there's a variety of ways you can do it, but ultimately the responsibility for separating foreground and background is your job, not GIMP's, because only you really know which is which. -- Stratadrake strata_ranger hotmail com -------------------- Numbers may not lie, but neither do they tell the whole truth. From: moorhouse shaw ca To: gimp-user-list gnome org Date: Fri, 26 Oct 2012 07:35:03 -0700 Subject: [Gimp-user] Change background and leave foreground Hello,
I have been trying to change the background color of the photographs of jewelry I took. It is too grey, and I want to change it to white. Each time I try to do this, it changes the whole picture to white instead of just the background. Can someone tell me how I can keep the foreground without losing it, and change the background color.
Your assistance would be most appreciated.
Fran _______________________________________________ gimp-user-list mailing list gimp-user-list gnome org https://mail.gnome.org/mailman/listinfo/gimp-user-list |
