From help-request at octave dot org Thu Feb  9 22:13:14 2006
Subject: Re: imread / imwrite general graphics
From: Stefan de Konink <skinkie at xs4all dot nl>
To: Stefan van der Walt <stefan at sun dot ac dot za>
cc: help at octave dot org
Date: Fri, 10 Feb 2006 05:11:28 +0100 (CET)

I grabbed the latest CVS version from sourceforge (finally).

My std2 works now, but writing is still an issue.

octave:10> [I] = jpgread('/home/skinkie/public_html/webcam.jpeg');
octave:11> J = double(I);
octave:12> std2(J(:,:,1))
ans = 66.963
octave:13> jpgwrite('/home/skinkie/public_html/test.jpg',J,50)
error: invalid conversion of NDArray to Matrix
octave:13> jpgwrite('/home/skinkie/public_html/test.jpg',I,50)
error: octave_base_value::matrix_value(): wrong type argument `uint8
matrix'
octave:13> imwrite('/home/skinkie/public_html/test.jpg',I,50)
error: transpose not defined for N-d objects
error: evaluating postfix operator `'' near line 181, column 9
error: evaluating assignment expression near line 181, column 7
error: evaluating if command near line 176, column 1
error: called from `imwrite' in file
`/usr/share/octave/2.1.72/site/m/octave-forge/image/imwrite.m'
octave:13> imwrite('/home/skinkie/public_html/test.jpg',I)
error: transpose not defined for N-d objects
error: evaluating postfix operator `'' near line 177, column 10
error: evaluating assignment expression near line 177, column 8
error: evaluating if command near line 176, column 1
error: called from `imwrite' in file
`/usr/share/octave/2.1.72/site/m/octave-forge/image/imwrite.m'



So I guess the problem is partly solved now. But the writing is still an
open end.



Stefan de Konink



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