On Wed, Sep 16, 2009 at 7:02 AM, Bob Meetin <[email protected]> wrote: > Subject says it all. I have a large assortment of product pictures > which I need to give uniform backgrounds, preferably white. Can someone > point me to a tutorial that discusses how? You can see a representative > sample image at: http://www.dottedi.biz/images/diagnostics/DSC_4355.JPG. > They can probably live with the shadows if I can lose the bulk of the > background. > > Thx, Bob
For this kind of thing, there is the name 'greenscreening', in which a matte, contrasting color is used as a background for an object, allowing the object to be easily separated from the background. In that case, Foreground-select is ideal. However, you basically have the opposite: A photo of a bluish-gray object on a bluish-gray background. Naturally this is very hard to separate automatically! So for such pathological cases, paths is probably a better choice. Smoothness is not a big deal (in fact the selection created by foreground-select is entirely binary, no smoothing involved)... this is because you can convert the selection to path and then that path back to selection if you want it smoother. If I needed to handle your example in the way you want, I would: * use foreground-select to get a rough approximation (make sure that there are no 'holes' by marking areas as foreground as needed) * enter QuickMask mode (click the icon to the left of the scrollbar) * select paintbrush with an appropriate brush and black color, paint away the wrongly selected parts * exit QuickMask mode (click the icon to the left of the scrollbar) * Select->To Path * Tweak the path if needed * right click on the path in the Paths dialog -> 'Path to Selection' If your example wasn't pathological (ie if it had a good contrasting background), I would just use foreground select, convert to a path, tweak the path, and convert it back to a selection. Afterwards in either case, I'd probably just Select->Invert and fill with white (like this: http://i26.tinypic.com/bdpjm0.jpg ) _______________________________________________ Gimp-user mailing list [email protected] https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
