[Gimp-user] Collage scaling up

2011-05-16 Thread rich
I intend to create a huge collage (22000 x 24000 pixels = 4.6 GB file 
size). Working on the image becomes impracticably slow.

Is there a way to do the whole collage in small (10% of the size / 
resolution), arrange layers, masks etc. in the small version until it 
fits, and then convert it to the full size version? I guess that would 
mean first changing the image resolution, and then have GIMP 
automatically re-import all pictures (layers) in original size. It 
should keep all layer properties and just recalculate all layers with 
the higher resolution using the original picture size.

If there is a way to do this? Or another way to get the same result?

Thanks
Chris

I would say Inkscape. It has presets A0,A1 which are poster sizes

Using Inkscape 0.48, PCLOS2010 KDE, an old 3 GHz Pentium 4  with 2 GB ram

For the sake of an experiment I made a 24000 x 18000 page.

Quick test, a patterned background + importing 5 bitmap images ( as links not 
embedded)

Export to png (no jpg alternative), you have to be careful with the dpi setting 
or the image will be truly enormous.
So 100 dpi gave an image 26667 x 2 pix (guessing the original was screen 
dpi)
Export took some time to render but the cpu was never maxed and ended up with a 
215 MB png file. The svg for saving was 41KB - (hence the linked bitmaps)

Problem now, I can't view the png image, I've come across this before making 
big mosaics, tried to open in evince, CPU max's, memory max's, swap partition 
heading for max, as the png unpacks. Killed it before it locked the machine. 
Still have the svg for viewing/editing and presumably a printing company will 
handle big bitmap files.


-- 
rich (via gimpusers.com)
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Re: [Gimp-user] Collage scaling up

2011-05-15 Thread Greg Chapman
Hi Chris,

On 15 May 11 01:01 Christoph Schwitter christophschwit...@bluewin.ch
said:
 If there is a way to do this? Or another way to get the same result?

Scaling down will always mean that, at some point, you will need to 
up-scale it with the consequent loss of detail.

Stitching several parts together will lead to a slow final process, 
which may coke if you have insufficient RAM.

Probably the only way to do it well is to ensure you have enough RAM 
installed, and that will mean an nnnooormous amount. The image 
size, that the GIMP works with is many times bigger than a JPEG file 
that you load. Check the status line on the GIMP. A typical 2.2Mb file
from my 9Mpx camera expands to around 80Mb once uncompressed for 
editing within the GIMP.
 
Greg Chapman
http://www.gregtutor.plus.com
Helping new users of KompoZer and The GIMP
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Re: [Gimp-user] Collage scaling up

2011-05-15 Thread John Culleton
On Sunday, May 15, 2011 03:56:15 am Greg Chapman wrote:
 Hi Chris,
 
 On 15 May 11 01:01 Christoph Schwitter christophschwit...@bluewin.ch
 
 said:
  If there is a way to do this? Or another way to get the same result?
 
 Scaling down will always mean that, at some point, you will need to
 up-scale it with the consequent loss of detail.
 
 Stitching several parts together will lead to a slow final process,
 which may coke if you have insufficient RAM.
 
 Probably the only way to do it well is to ensure you have enough RAM
 installed, and that will mean an nnnooormous amount. The image
 size, that the GIMP works with is many times bigger than a JPEG file
 that you load. Check the status line on the GIMP. A typical 2.2Mb file
 from my 9Mpx camera expands to around 80Mb once uncompressed for
 editing within the GIMP.
 
 Greg Chapman


If the OP is working in Linux then perhaps the swap space would take up the 
slack. Also, it may be possible to produce all the pieces of the collage in 
Gimp and then stitch them together in another program, such as Scribus or 
ImageMagick. ImageMagick has a Montage program that might be useful. Any 
program that lacks the memory overhead of Gimp could be used. 
-- 
John Culleton
Wexford Press
Death Wore Black
Police procedural
by retired police chief Bill Redding
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[Gimp-user] Collage scaling up

2011-05-14 Thread Christoph Schwitter
I intend to create a huge collage (22000 x 24000 pixels = 4.6 GB file 
size). Working on the image becomes impracticably slow.

Is there a way to do the whole collage in small (10% of the size / 
resolution), arrange layers, masks etc. in the small version until it 
fits, and then convert it to the full size version? I guess that would 
mean first changing the image resolution, and then have GIMP 
automatically re-import all pictures (layers) in original size. It 
should keep all layer properties and just recalculate all layers with 
the higher resolution using the original picture size.

If there is a way to do this? Or another way to get the same result?

Thanks
Chris

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[Gimp-user] Collage scaling up

2011-05-14 Thread Stefan Maerz
 If there is a way to do this? Or another way to get the same result?

The best thing I know to do is to work in small chunks whenever
possible. You can open up .xcf files withIn another .xcf, using open
as layers. Perhaps for the final layout you can bear though it?

The open as layers feature will keep the layers of the smaller .xcf
files accessible from your final image. However, I think it will
consume less memory if you export a flattened image - meaning you
won't have access to the layers.

Either way you do it, get yourself a nice computer. ;)

Best of luck,

-Stefan Maerz
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