GNOME Bugzilla – Bug 669436
Slow performance when using Color tools.
Last modified: 2012-02-08 17:51:38 UTC
Hello! I'm using Gimp 2.7.4. System Intel Dual Core E2200, 4GB RAM, Nvidia GF 8500 GT 512RAM. Linux Mint 12 updated. Installed Nvidia proprietary drivers. GEGL is not enabled. When editing photos (changing Saturation or Levels) the effect gets applied in a rather slow "Line by line" fashion. When I open more than one image it gets worst :) Examples: http://i42.tinypic.com/5yhjxv.jpg http://i39.tinypic.com/1692uq8.jpg
How many MPixels/sec is "slow". Start gimp from the terminal to see the output.
Hello! This is the output I have for two images: Levels: 11.6383 MPixels/sec Levels: 10.3524 MPixels/sec Hue-Saturation: 6.55119 MPixels/sec Hue-Saturation: 4.77966 MPixels/sec Levels: 12.1085 MPixels/sec Levels: 9.69473 MPixels/sec Hue-Saturation: 5.58581 MPixels/sec Hue-Saturation: 4.17124 MPixels/sec
Maybe I didn't express myself correctly. Is there a way to show the speed at which the "Live Preview" of those edits gets updated on the screen? That's what I find to be slow. Applying the effect speed doesn't bother me at all, it's the "Live Preview" of the effect which is rather slow.
The live preview is updated in the same speed the effect is calculated, incrementally, without blocking the GUI. Do you ask for the update being held back until the entire region is processed?
I hate to compare Gimp with Photoshop, but thats where I'm coming from. In PS when I open 130 photos, with the same resolution as these, I can still see instant live update when changing Saturation or Levels. The speed at which Saturation and Levels is shown in the live preview in Gimp is comparable to the speed of the Artistic Filters in Photoshop. Personally I don't mind if the effect is being "applied" do the image for 10 minutes as long as I have an instant "live preview" of the effect so I can quickly find the desirable levels and move to the next image. With the current speed at which live preview is drawing Saturation and Level changes, by the time it is finished I have forgotten if the previews settings looked better or not. In Photoshop I just click, click, click and find the right levels, but in Gimp if I try to do the same thing, the effect in the examples above happens. It may be better if the effect gets displayed at once and not line by line but it will be still at least 5-10 times slower than in Photoshop's instant preview. I was just wondering if I'm doing something wrong to have the live preview of Saturation and Levels being drawn so slow on the screen with only one image opened. This is why I filed this bug report. I'm sorry again to compare Gimp to Photoshop, please understand that I want to find a way to continue working the way I'm used to :) Nothing more or less. Thanks!
I see, in this case it's a duplicate. *** This bug has been marked as a duplicate of bug 114268 ***