Hi, I just heared a linux link teach show where a girl was saying that the gimp didnt handel as large files as photoshop.

wanted to test this out, so I set my tile cache to 512meg. and undo to 512 also..

and made an 8000x8000 file in the gimp and Photoshop and did some tests.

Gimp CVS as of today and Photoshop 7 under wine.

* Painting with an 1000 size brush, both performed about the same on both. * Curves was much faster on photoshop.

I tried gimp and photoshop with nice -20, highest priority) - Gimp was noticable faster..
Photoshop didnt make much difference, (not sure how wine handels nice)

From the updates to curve, it looks like the tile size for photoshop is Higher then teh gimps.
I was wondering is there a way to increase gimps tilesize - would there be any benifit?

On the other hand, Photoshop may be working on a smaller copy of the image at 1:1,
has this been considered by the gimp dev's?

- Cam

On Monday 01 May 2006 11:37 am, Campbell Barton wrote:

On the other hand, Photoshop may be working on a smaller copy of the image at 1:1,
has this been considered by the gimp dev's?

it most certainly does, and then does the real curves work on the background.

Considered? Yes.
Made? No.

Nowadays it is sort of postponed until after 2.4 is released and GeGL starts to be integrated into the GIMP. I think one of the great bennefits of GeGL will be allowing doing this kind of live previews with transparent background processing - Although that will not come for free with the GeGL.

Invalid?
Well photoshop 7 runs fast in wine. fast enough that it even significantly out performs gimp in areas. there are even a number of benchmarks showing wine to be faster then XP on the same PC. winning about half the tests thrown at it.

There not exact benchmarks, but they indicate that Photoshop uses different methods then the gimp to operate on images.

EG. If painting in both apps are about the same for painting on a 8000x8000 image.
you can assume they use a roughly similar painting method.

if Curves on Phoposhop is instant, and takes 3 second on the gimp. then photoshops doing somthing gimp isnt.

Also, a lot of people are interested in an image editor for Linux- Photoshop+Wine is that. (albeit X86 only)

- Cam

Andreas Røsdal wrote:

Hello Campbell,

You're benchmarking is invalid. What you have really tested here is only how good Photoshop performs when emulated with Wine. If you test in with native Windows, I'm sure you will get a different result.

Andreas Røsdal

Campbell Barton wrote:

Hi, I just heared a linux link teach show where a girl was saying that the gimp didnt handel as large files as photoshop.

wanted to test this out, so I set my tile cache to 512meg. and undo to 512 also..

and made an 8000x8000 file in the gimp and Photoshop and did some tests.

Gimp CVS as of today and Photoshop 7 under wine.

* Painting with an 1000 size brush, both performed about the same on both.
* Curves was much faster on photoshop.

I tried gimp and photoshop with nice -20, highest priority) - Gimp was noticable faster..
Photoshop didnt make much difference, (not sure how wine handels nice)

From the updates to curve, it looks like the tile size for photoshop is Higher then teh gimps.
I was wondering is there a way to increase gimps tilesize - would there be any benifit?

On the other hand, Photoshop may be working on a smaller copy of the image at 1:1,
has this been considered by the gimp dev's?

Hi,
cbarton@metavr.com (2006-05-02 at 0420.43 +1000):

if Curves on Phoposhop is instant, and takes 3 second on the gimp. then photoshops doing somthing gimp isnt.

You are running all this in Linux, right? So you probably have access to all kind of system monitors. Could you run the tests while having at least one such monitor well visible and report back what you see? Thanks in advance.

GSR

Hi,

"Jean-Luc Coulon (f5ibh)" writes:

Just after displaying the splash screen, it segfaults.

CVS ChangeLog 1.12518, build on amd64 architecture.

Please CVS update. I believe this has been fixed in the meantime.

Sven

Hi,

Campbell Barton writes:

From the updates to curve, it looks like the tile size for photoshop is Higher then teh gimps.
I was wondering is there a way to increase gimps tilesize - would there be any benifit?

It is only possible by recompiling all of GIMP and you end up with a version of GIMP that writes incompatible XCF files and cannot read the XCF files written by a version of GIMP compiled with a different tile size. I have done this at some point and did some tests. I had the impression that using a larger tile size doesn't make any noticable performance difference.

If someone wants to rewrite the XCF routines so that tiles are always written and read with a size of 64. no matter what the native tile size is, we could make the tile-size configurable. But I am not sure if that's worth the effort.

On the other hand, Photoshop may be working on a smaller copy of the image at 1:1, has this been considered by the gimp dev's?

Yes, this has been considered and for the color correction tools, it would actually be a good idea. But as far as I know, no attempt has been made to actually implement this.

Sven

Hello Sven
Where would I look to change the tilesize? - Thanks in advance :)

Sven Neumann wrote:

Hi,

Campbell Barton writes:

From the updates to curve, it looks like the tile size for photoshop is Higher then teh gimps.
I was wondering is there a way to increase gimps tilesize - would there be any benifit?

It is only possible by recompiling all of GIMP and you end up with a version of GIMP that writes incompatible XCF files and cannot read the XCF files written by a version of GIMP compiled with a different tile size. I have done this at some point and did some tests. I had the impression that using a larger tile size doesn't make any noticable performance difference.

If someone wants to rewrite the XCF routines so that tiles are always written and read with a size of 64. no matter what the native tile size is, we could make the tile-size configurable. But I am not sure if that's worth the effort.

On the other hand, Photoshop may be working on a smaller copy of the image at 1:1, has this been considered by the gimp dev's?

Yes, this has been considered and for the color correction tools, it would actually be a good idea. But as far as I know, no attempt has been made to actually implement this.

Sven

Hi,

Campbell Barton writes:

Where would I look to change the tilesize?

app/base/tile.h

Sven

Thanks, tested 16, 128 and 512 tilesizes. on a 8000x8000 image Didnt notece many speed differences except 16 was a lot slower. Keep with 64 :)

Sven Neumann wrote:

Hi,

Campbell Barton writes:

Where would I look to change the tilesize?

app/base/tile.h

Sven