Re: [Gimp-user] how to obtain the same adjustment in GIMP like this one in Photoshop Express

[Pat David <patdavid gmail com>]

If you're looking to isolate adjustments to a particular set of tones
(shadows, mids, highlights) then you might want to check out luminosity
masks:

https://www.gimp.org/tutorials/Luminosity_Masks/
On Thu, Apr 6, 2017 at 6:26 PM Cristian Secară <liste secarica ro> wrote:

> I played a bit with Adobe Photoshop Express in Windows phone and found
> a useful adjustment that increases the gain in deep shadow portions,
> while at the same time keeps *untouched* the already bright areas
> (above a certain predefined level).
>
> Here is a sample:
> (original image)
> http://www.secarica.ro/temp/test_808_original.jpg
> (shadow increase to 100%)
> http://www.secarica.ro/temp/test_808_photoshop_express_shadow_100.jpg
> For the above image, the processing time when saving is about 11
> seconds (on a 1.2GHz quad core Windows phone).
>
> The application's adjustment looks like this
> http://www.secarica.ro/temp/wp_ss_20170407_0003.png
>
> I tried in GIMP various filters, effects, scripts, curves, fake HDR
> etc. but with either I played with, there was always a slight change
> also in the bright portions of the image.
>
> What adjustment can be used to obtain the exact same result by using
> GIMP ?
>
> Here is another sample:
> (original image - filename nokia_lumia_1020_10.jpg on this page
> http://www.photographyblog.com/previews/nokia_lumia_1020_photos/ )
> (shadow increase to 100%)
> http://www.secarica.ro/temp/test_1020_photoshop_express_shadow_100.jpg
>
> Thank you,
> Cristi
>
> --
> Cristian Secară
> http://www.secărică.ro <http://www.xn--secric-k0ad.ro>
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