Re: GIMP with large files

["chewy_pete" <patrick.ouellet@xxxxxxxxx>]

--- In gimpwin-users@xxxxxxxxxxxxxxx, Tor Lillqvist <tml@...> wrote:
 
> Hmm, isn't what you mean probably more like 500MB (12800*12800*3)?

You are right after checking the 8bit uncompressed 12800x12800 file
was 526MB. The file I was talking about which was 800MB was a 12bit
uncompressed tiff with 7680x13824 size.

> But anyway, if I understand correctly, GIMP requires more storage than
> three bytes per pixel for the image: also one byte per pixel for the
> selection mask, and three bytes for the "projection".
> 
> Still that should just be possible even in the 2.2 version. I tried
> creating a new 12800x12800 RGB image and managed even to fill it with
> a gradient.
> 
> In the bleeding edge development version I have tested gigapixel
> images but in the stable 2.2 branch the main problem is that the size
> of GIMP's tile swap file is limited to 2 GB.

Will this change or it is a OS limitation?

> Hmm. It shouldn't freeze, but it might get very slow if it has to
> start using the tile swap file all the time. Does the disk start
> rattling when it freezes?

Under linux it freezes like I "tried" to explain but it will
eventually load the picture and once it is loaded its quite fast.
Impressively :D

> How much memory does the machine have? How large have you set GIMP's
> tile cache? Set it as large as you can. If you have 1 GB of memory,
> set the tile cache size to maybe 700 MB. Note that as you do changes
> to the image, the old contents (those parts that are touched) gets
> saved for undo purposes, and edits that touch large parts of the image
> are quite slow. Limit the number of undo steps if you want to avoid
> this.

Thanx for the tips I will test that as soon as I reboot under windows.
I just installed linux and wanted to see if the performance would be
better. I actually loaded the 500MB picture and it took a bit less
time than in Windows.

The machine Im using has 1GB of ram, but many of the systems here have
fewer than this and some have more. What would be a good ratio for the
tile cache? 3/4 of the machine RAM?

> 
> You might want to try with the Windows build of the next development
> version (2.3.15) when that is released, if and when a Windows build of
> it gets done.
> 
> --tml
>

I'll check this out!

Btw I tried and was succesful in loading a 12 bit picture onder linux
but all I get is a big black rectangle.. so I assume it has something
to do with the 12 to 8 bit conversion.




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