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Is there a way to modify the exposure on a specific part of an image using rawtherapee, Gimp's ufraw, or any other free/open source tool?

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what it's the problem of using a brush and paint the parts that you want to modify? Also using gradient tool could do it –  akram Jul 9 '12 at 19:03
    
@AkramMellice would you be able to provide a more detailed answer? –  dassouki Jul 9 '12 at 19:55
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@AkramMellice Neither ufraw or rawtherapee have brush or gradient tools. –  ElendilTheTall Jul 10 '12 at 9:14
    
@ElendilTheTall yeah I'm not knowledgeable in both so I was suggesting to look for them but wasn't sure if they exist or not so I didn't post an answer, thanks for the info –  akram Jul 10 '12 at 9:20

2 Answers 2

up vote 3 down vote accepted

I'm doing it my way in GIMP - I take "Free select tool", select the part I want to modify. Then I feather the edges of the selection by 30-100px depending on the size of selection (most often I go for 50px), then I copy the feathered selection and past it as a new layer. This way I can do any adjustments to this particular bit and the rest of the image will remain untouched.

It takes time to post process an image this way, but it allows me to achieve desired results, so I like to work like this.

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You can do this in Darktable using the 'Zone System' plugin, shown below. I'm making the assumption that the part of your image you want to modify would be automatically selected by the plugin for adjustment (shown in yellow highlighting in my screenshot).

Darktable zone system plugin screenshot

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It should be noted that Darktable is essentially a Linux-only raw processor. There is an OSX version but it is somewhat buggy. –  ElendilTheTall Jul 10 '12 at 9:15

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