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Gimp performance issues

Sep 25, 2013, 15:28 (This post was last modified: Sep 25, 2013 15:35 by tsydeemi.)
Post: #1
Gimp performance issues
Hi,

I'm compiling these large images (one image 12000x12000) and I might have 9 of them in one picture. The problem is that Gimp gets darn slow and crashes easily when I have even 6 of those pictures compiled to one image. I know about the tile cache memorylimit and I believe it's pretty maxed out in my system as it is 4,1 gigabytes and when I'm using gimp with these large images I have 7,6 gigabytes of my 8 gigabytes of RAM in use. (By the way why does a 140 MB image consume over 4 GB of RAM?)

I'd say that this isn't caused by the lack of my computer's resources but because gimp can't take everything out of them. But the question is can there be anything done in order to get Gimp more efficient with my computer.

I'm running Windows 7 x64 with AMD phenom II X6 1045T processor, 8,0 GB of RAM and ATI radeon HD 5570.


P.s When I merge the image a short line of randomly colored pixels appear on every top left corner of each layer being merged. Any ideas on how to eliminate this from happening so I woudn't have go paint brush them one by one?

Edit: I'll also welcome any suggestions of other free programs that can compile large images.
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Sep 25, 2013, 16:19 (This post was last modified: Sep 25, 2013 18:42 by rich2005.)
Post: #2
RE: Gimp performance issues
Quote:I'm compiling these large images (one image 12000x12000) and I might have 9 of them in one picture....snip...(By the way why does a 140 MB image consume over 4 GB of RAM?)..

Image 140 MB compressed, image in memory uncompressed 4 GB
Here, a 26 MB png (3.3 MB jpg) runs to 174 MB in memory and that is without any additional layers etc. Make a big canvas then start pasting images, adding layers and watch the memory usage spiral.

Quote: Edit: I'll also welcome any suggestions of other free programs that can compile large images.

The only one I have used is NIP2
http://www.vips.ecs.soton.ac.uk/index.php?title=Nip2
and that was some time ago.

edit You might have a look at Hugin, the panorama maker, which I believe can now stitch rows and columns of images.

edit again: this is a look at NIP2 small images but stitching rows and columns
http://web.archive.org/web/2012101713211...erfectmap/

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Sep 26, 2013, 07:28 (This post was last modified: Sep 26, 2013 07:31 by iForStyle007.)
Post: #3
RE: Gimp performance issues
You might be setting your memory/tile cache settings too high. If you don't leave enough ram for the OS/other processes it can crash gimp to save resources/make space for other programs.

Doing a little math, 140mb(initial size) x 6 photos is 840mb just shy of 1 gigabyte.

I have a vista desktop that was running sluggish but after I set the page file initial size to 3050mb (its 4gbs) I noticed a performance gain, having it always on system managed was robbing me of performance in my case.

tsydeemi:

So to add to rich's starting canvas size. After making a new canvas(no image imported yet) How much ram does Gimp then take up?
(this is even if you have 8gb of ram, it can be shared by background processes, other apps...)

Below excerpt from : http://www.gimp.org/unix/howtos/tile_cache.html

"A low value means that GIMP sends data really quickly to disk, not making real use of the avaliable RAM and making the disks work without real reason. A too high value, and the other applications start to have less system resources forcing them to swap space, which is making the disks work too, or maybe some will even get killed or start to malfunction due lack of RAM."

*Also check your new image size(mb) and set that to 140 mb (under the tile cache settings)

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