Re: Large image re-scaling

From: Severian (severian_at_chlamydia-is-not-a-flower.com)
Date: 06/05/04 

Date: Sat, 05 Jun 2004 04:42:27 GMT

On 4 Jun 2004 15:44:17 -0700, crwper@mustagh.com (Michael Cooper)
wrote:

>I have a fairly large image (21600x21600x3) which I would like to
>enlarge to 32768x32768. I've tried several packages (GIMP,
>ImageMagick, Paint Shop Pro, Image Genius, PhotoZoom Pro, etc.), but
>they all seem to be trying to load the entire file into memory first.
>I'm not terribly fussy about the interpolation technique, although I'd
>like something better than the nearest-neighbour code I've just
>written. Bicubic would be fine. The image is currently in TIFF format.
>
>I am using Windows XP, but if it helps I can always move the images
>over to my Mac, which is running OS X.

Hopefully Helpful Notes:

1. Your original image is 1.3 Gb.
2. The target image is 3.2 Gb.
3. The extra 2Gb is all interpolated and adds no real information; why
is this excercise necessary?
4. Systems with 4Gb address spaces are quite unlikely to have 3.2 Gb
of contiguous free space.
5. Many TIFF libraries are limited to 2Gb output.
6. There probably exists some program which can do what you want, but
I don't know what it is, and it's likely to be expensive.

Have you tried Photoshop? 

-- 
Sev