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Re: image.m and scaling
From: |
avraham |
Subject: |
Re: image.m and scaling |
Date: |
Sat, 4 Jun 2005 06:49:25 +0300 |
User-agent: |
Mutt/1.5.5.1+cvs20040105i |
On Fri, Jun 03, 2005 at 05:59:28PM -0400, Brian Blais wrote:
> Hello,
>
> I was wondering what others thought of the following observation. When
> I do an image command, or an imagesc command, the resulting image is
> increased in size (IMHO, good) and smoothed (IMHO, bad). Usually when I
> am looking at a small matrix, I am looking at data and would like to see
> an honest representation of those data points, more similar to matlab's
> image command. If one changes one word in image.m from:
>
> im_display = sprintf ("display -geometry %f%% \"%s\"", zoom*100, ppm_name);
>
> to:
>
> im_display = sprintf ("display -sample %f%% \"%s\"", zoom*100, ppm_name);
>
> using the -sample option, then you get the same increase in size, which
> is good for visibility, and the image is not smoothed. Try it with:
>
> imagesc(rand(20));
>
> and you'll see the difference. Is this something that others would
> like, or is the present behavior there for some reason?
>
>
> thanks,
>
> Brian Blais
>
>
> --
> -----------------
>
> address@hidden
> http://web.bryant.edu/~bblais
>
>
>
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Good Morning,
Thanks for the note. I never noticed that before, maybe because I
usually work with large arrays and only seldom used the zoom
argument. I fully agree with you: The default should be the
faithful representation of the data. If anyone wishes to smooth
the image, let them do it on their own, in precisely defined
conditions.
Cheers, Avraham
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Octave is freely available under the terms of the GNU GPL.
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