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how to obtain the same adjustment in GIMP like this one in Photoshop Express

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how to obtain the same adjustment in GIMP like this one in Photoshop Express Cristian Secară 06 Apr 23:19
  how to obtain the same adjustment in GIMP like this one in Photoshop Express Pat David 07 Apr 01:31
Cristian Secară
2017-04-06 23:19:39 UTC (about 7 years ago)

how to obtain the same adjustment in GIMP like this one in Photoshop Express

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
Pat David
2017-04-07 01:31:09 UTC (about 7 years ago)

how to obtain the same adjustment in GIMP like this one in Photoshop Express

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 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
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