Re: Anybody have a prgram to write a .bmp file?

[Jordi Gutierrez Hermoso]

On 29/01/07, Robert A. Macy <address@hidden> wrote:
> I need a program that writes an r, g, b set of matrices to
> create a .bmp file
>
> Anybody got one?

Sure. ImageMagick. I think I heard you say that you use a non-free
operating system, and I'm not sure if those distributions of Octave
include ImageMagick by default; you might have to get it on your own.

I'm also using the 'forge script imwrite to do the writing.

> for example: here are the simple matrices:
> >> r=ones(256,1)*(0:255)/255;
> >> g=.5*ones(256,256);
> >> b=.5*ones(256,256);
>
> I tried to do
> >> imshow(r,g,b);
> but I only get a solid colored image with no shading
> variations.  the colors only come up based upon the first
> few pixels

That's odd. I can't reproduce this behaviour on Debian with Octave
2.9.9. Octave is calling ImageMagick to do the rendering, though, and
I think I read that you aren't using ImageMagick.

HTH,
- Jordi G. H.