Re: [Gimp-user] How to edit/modify part of an image (sub-area of animage)?

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: gimp-user-list gnome org
Cc: notifications gimpusers com
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
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