Re: image, imshow and similar display empty axes

[nicos]

bpabbott wrote
> *** Please "reply-all" and respond at the bottom of the email ***
> 
> On Nov 2, 2012, at 5:16 AM, Jan-Timm Kuhr wrote:
> 
>> On 31.10.2012, at 22:02, Ben Abbott wrote:
>> 
>>> On Oct 31, 2012, at 3:15 PM, Jan-Timm Kuhr wrote:
>>> 
>>>> Hello,
>>>> I'm working on with octave 3.6.3. on a Mac.
>>>> When I try to plot a 2D image, say by using image(rand(10)), I get an
>>>> correct set of axes, but filled with with white space instead.
>>>> 1d plots seem to work alright.
>>>> I suspect that it has something to do with working on a Mac.
>>>> I found this here https://savannah.gnu.org/bugs/?29522
>>>> but it links to another thread, which is rather cryptic, at least to
>>>> me.
>>>> Thanks a lot for any help,
>>>> jan
>>> 
>>> If you try ...
>>> 
>>>     h = image (rand (10))
>>>     set (h, "cdatamapping", "scaled")
>>> 
>>> ... do you get what you expect?
>>> 
>>> If so, you can try "imagesc()" instead of "image()"
>>> 
>>> Ben
>> 
>> Thanks Ben but it does not seem to have anything to do with the scaling
>> of the color map.
>> Best,
>> Jan
> 
> 
> With Octave 3.6.3 from Fink on MacOS 10.6.8 using Gnuplot 4.6 patchlevel 0
> and AquaTerm v1.0.1.
> 
> The command  image(rand(10)) produces a solid navy blue image.
> imagesc(rand(10)) produces random colors.
> 
> I'm get the same result using Octave 3.4.0 from MacPorts (on MacOS 10.7.5
> with Gnuplot 4.6 patchlevel 1 and AquaTerm v1.1.1).
> 
> Where did you get your Octave, Gnuplot and AquaTerm?  And what version of
> MacOS are you running?
> 
> Ben

Hello, 

I am not the original reporter of the issue, but I have the exact same
problem. 
I am running on OS X 10.8.2, with all programs built from Macports (octave
3.6.3, gnuplot 4.6.1, aquaterm 1.1.1). 

When trying to plot an image with gnuplot with aquaterm, everything seems
fine:
   plot "image.png" binary filetype=png w rgbimage

Then, when plotting a curve in octave, everything runs fine too: 
   plot(rand(1, 10))
However, imaging in aquaterm provides an empty set of axes (white
background):
   im = imread('image.png');
   imagesc(im);
Then, if changing the term to x11, the image can be displayed:
   setenv("GNUTERM", "x11");
   imagesc(im);
So that it really seems that there is an issue between octave and aqua
terminal. 

Nicolas



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