> I got 
> an insufficient memory message when attempting an 8000x12000 mosaic of 25 
> images.  A reduced-size 5000x7500 mosaic of the same 25 images seemed to 
> progress further, but failed to produce a complete .psd file due to 
> insufficient memory.  

The filesize of the layered panorama is roughly equal to the number of 
pixels times 3 bytes times the number of source images.

If you create a layered 8000x12000 pano, then each layer will be 288 MB 
(8000x12000x3 bytes) in size (even if the actual image only occupies a 
small part of the layer). You would need 25 x 288 MB for the entire 
panorama. 

However, Windows' file size is limited to 2 GB, so it will fail after 6 
images. There's no way you will ever get the complete panorama as a 
25-layer photoshop file.

The trick here is to make 5 separate panoramas, each of only 5 source 
images. For each partial panorama you then adjust the seams, do whatever 
retouching you need. Then you flatten the image and save as a psd file. 

When you have the 5 partial panoramas, insert them as separate layers 
into a new photoshop file and retouch the seems between the 5 'images'. 
Then flatten and you have your full panorama.

Joost

I believe that the 2GB file size limitation applies to older versions
of Windows. My references state that Win9x has a max file size of 4GB, and
WinNT, of 16EB - good news for large stitches!

--Simon

But regularly check whether you have enough free disk space available 
during large stitches..

I have a similar problem using the Panotools Photoshop plugin. 
I cannot "filter" any image larger than about 50mb on EITHER
my Macintosh v9 (1gb) or my Windows 2000 (256mb + 1gb swap).
NOTE that this is for a SINGLE image not layered!

So it appears that there is some sort of practical limit with
this product. 

Any ideas on how to fix this? My prefered file size is 150mb scans
from 6x7 negatives using my Polaroid Sprintscan 120

MJS