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Re: Problems reading photo input


From: Stefan van der Walt
Subject: Re: Problems reading photo input
Date: Tue, 21 Mar 2006 19:07:05 -0600
User-agent: Mutt/1.5.9i

On Mon, Mar 13, 2006 at 10:34:54AM -0700, Joe Koski wrote:
> Now that the image processing routines appear to be working via
> ImageMagick-6.2.6, I thought I'd try some tests. I'm using octave-2.1.72
> with octave-forge-2006.01.28 on my Mac with OS X 10.3.9.
> 
> There seems to be a problem with imread. For example, if I
> 
>   octave:1> pix=imread("Full-fire-later-2.tiff");
> 
> I get a 3D array of the appropriate size
> 
>   octave:2> size(pix)
>   ans =
> 
>   1032   689     3
> 
> but most of the elements of the pix matrix are numerically equal to 255
> (except for a few that are zero). This occurs with 2D gray scale images,
> color images, .jpg, .ppm, .tiff, etc. The resulting image.m output displays
> an appropriately uniform image (black, white, or a single color).

I submitted a patch to work around this problem two weeks ago.  I
haven't had time to debug the imagemagick wrapper, though.

See the bug report at

http://sourceforge.net/tracker/index.php?func=detail&aid=1439598&group_id=2888&atid=102888

Further discussions of this problem should probably take place on the
octave forge list (address@hidden).

Regards
Stéfan



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