Hi Rhimbo! Did you try any of the answers to your question on the pixls.us forums? You asked the same question there a week ago:
https://discuss.pixls.us/t/gimp-how-to-edit-modify-part-of-an-image-sub-area-of-image/2041 and we gave you some things to try (but hadn't heard back from you). In particular, I pointed you to a tutorial on the www.gimp.org website: http://www.gimp.org/tutorials/Luminosity_Masks/ There is also a complementary tutorial that introduces the concepts of layer masks if you wanted to take a look: http://www.gimp.org/tutorials/Layer_Masks/ Those should be a decent start towards the skills and concepts you'd need to do what you want, I think. If you get a chance to try them out let us know how you got along (or if you have any further questions). pat On Sun, Aug 21, 2016 at 6:41 PM Rick Strong <[email protected]> wrote: > Rhimbo: Try using a Quick Mask and a black to white Gradient to select the > area you want to work on. Then use curves (or levels) to lighten or darken > your selected area. You can also paint on the gradient mask to include or > exclude things from what you will be darkening or lightening. > > Quick Mask is Shift+Q in multi-window mode or the little dotted rectangle > at > the lower left end of the scroll bars in the single-window mode. Or, Select > > Toggle Quick Mask. > > See Quick Masks and Gradients in the manual. I suggest testing first on an > unimportant photo. > > Rick S. > > -----Original Message----- > From: rhimbo > Sent: Sunday, August 14, 2016 3:32 PM > To: [email protected] > Cc: [email protected] > Subject: [Gimp-user] How to edit/modify part of an image (sub-area of > animage)? > > Hello everyone, > > Just for context, let me say that I'm still relatively unskilled in Gimp... > > I would like to modify part of a photo, for example a .jpg photo. For > instance, > I want to adjust the exposure or lighting of some sub-area of the whole > photo. > How can I do that? > > The context of my question is as follows. Without using a neutral density > filter, often it's very difficult (nearly impossible!) to shoot certain > scenes > so that all parts of the image have the optimal exposure. For example, the > sky > might have the right exposure but a building or foliage might be too dark. > Or, > depending on your choice of image area for metering measurement, the > ground/foliage might be properly exposed but the sky over-exposed. I have > many > photos right now for which I'd like to lighten the dark areas without > over-exposing the sky. > > I've tried playing with selecting a rectangle and changing lighting but I > must > be making user errors. Could someone please point me in the right > direction....? > > Many thanks, > > > > -- > rhimbo (via www.gimpusers.com/forums) > _______________________________________________ > gimp-user-list mailing list > List address: [email protected] > List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list > List archives: https://mail.gnome.org/archives/gimp-user-list > > _______________________________________________ > gimp-user-list mailing list > List address: [email protected] > List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list > List archives: https://mail.gnome.org/archives/gimp-user-list > _______________________________________________ gimp-user-list mailing list List address: [email protected] List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list
