Gimp 2.10 blur like 2.8(no gamma correction)

Biome · **Joined:** Oct 27, 2024 **Posts:** 6

GIMP Version: 2.10.38
Operating System: Windows
OS Version: windows 10
GIMP Experience: Basic Level

I am trying to get blur in Gimp2.10 (gaussian,motion etc) to give results like 2.8.For images without color blurring and then levels tool gamma 0.45 gives same result as 2.8.But for color images it is not matching.what is the correct way to get same or close result as 2.8 blur.thankyou

Attachment:

blur_2.8vs2.10.jpg [ 30.63 KiB | Viewed 1433 times ]

Attachment:

blur-color_2.8vs2.10.jpg [ 36.78 KiB | Viewed 1433 times ]

ofnuts · **Joined:** Oct 25, 2010 **Posts:** 4812

Technically, the Gimp-2.8 way is wrong, because it darkens images.

If you still want the 2.8 results, apply the gamma encoding over the current image (so that Gimp linearizes it to the initial gamma values) let Gimp do its thing, and remove the extra encoding. You may have round-off errors, though

You can find functions to apply the gamma-encoding both ways (actually, the sRGB encoding used by Gimp) in my ofn-srgb script.

Biome · **Joined:** Oct 27, 2024 **Posts:** 6

ofnuts wrote:

Technically, the Gimp-2.8 way is wrong, because it darkens images.

If you still want the 2.8 results, apply the gamma encoding over the current image (so that Gimp linearizes it to the initial gamma values) let Gimp do its thing, and remove the extra encoding. You may have round-off errors, though
You can find functions to apply the gamma-encoding both ways (actually, the sRGB encoding used by Gimp) in my script.

thanks,that gives perfect result.(just noting,levels gamma 2.2>blur>levels gamma 0.45 also works,but maybe less accurate).