Re: Tiff monchrome memory usage

[David Stevenson <david avoncliff com>]

John Cupitt wrote:
> On 12/22/05, David Stevenson <david avoncliff com> wrote:
>
> > I am using tiff files that are 9000x6000 pixels black and white.
> > ( they are schematic drawings intended to print A0 size )
> > I calculate this as just under 8meg at 1 bit per pixel, however when I
> > open in Gimp or Eye of Gnome they seem to use over 200meg of ram, which
> > pushes my 256meg Macmini into swapping and makes the files unusable.
>
>
> I did some tests with a 10k x 10k pixel 1 bit image on my laptop. gimp
> needs just over 200MB of RAM, so I guess they represent the image as 8
> bits per pixel plus a bit. eog needs about 350MB, so they might be
> using RGBA.
>
> I maintain an image processing package called nip and it needs just
> over 30MB to view and manipulate the image. But it's not a paint
> program and can be tricky to use :-( if you're curious, you can
> download from:
>
> http://www.vips.ecs.soton.ac.uk/
>
> John
Thanks John,
 I have emerged nip2 and now I can view my drawings no problem.
David