Ben Mitch

Hi Jesper

Forgive me, I was just using Panel myself today and noticed strange behaviour with respect to smoothing and import into Word. Suddenly clicked that I was seeing what you were flagging up the other day. Sorry, I did do some testing before and thought I'd got to the bottom of what you were seeing. Clearly, not - but I understand now :).

This is fixed now for PNG and TIF filetypes which now import correctly whether smoothed or not. Looks like JPEG does not include a DPI setting at all, or at least not one that I can make work. JPEG's not very useful, here, anyway. Next release of Panel will include the fix.

Thanks for the heads up :)
Ben

Hi Jesper

Yeah, that's right. By scaling it you're overriding the default DPI either set in the file or assumed by Word.

Some image formats can include a resolution setting (TIFF, PNG, also JPEG?). However, these settings don't propagate to the image file through Matlab's print() function (at least, not to my testing). Panel does not attempt to fix up this information after print() is called because, well, because you're the first person who's flagged it up :). I use Latex for documents, which ignores image DPI, so I'd not noticed.

Erm... It would require either binary hacking or a time-consuming imread()/imwrite() cycle, I guess, to fix it. And Matlab's imwrite() appears not to provide access to these fields for JPEGs. Potentially this could be done, would it make a big difference to you? In any case, I won't prioritise it since the scaling is easy enough.

If you're using PNG (looks like it), you could add it yourself as a read/write step after p.export(), something like:

function set_png_dpi(filename, dpi)

im = imread(filename);
dpm = dpi / 25.4 * 1000;
imwrite(im, filename, ...
  'XResolution', dpm, ...
  'YResolution', dpm, ...
  'ResolutionUnit', 'meter');

Inefficient as hell, but would do what you want. If anyone has a smarter solution, I'll gladly consider adding it to Panel.

Cheers
Ben

[edited email exchange with "Steffen"]

>> I was wondering: Is it possible to set the background color of the exported figure? I tried
>>
>> set(gcf,'Color',[0,0,0])
>>
>> In the matlab window the background is black. But after p.export the background is white again.
>>
>> What am I doing wrong :?

> set(gcf, 'Color', [0 0 0], 'InvertHardcopy', 'off')
>
> cheers
> ben

Thanks Ben. That is the kind of an answer I was expecting. I had this wrong perception that I can only access methods from an instance p, but you saved me!

Best regards

Sorry, I forgot one line. Following is the correct code I use

cvars = who;
    foundpanel = false;
    for i=1:numel(cvars)
        try
            foundpanel = evalin('base', ['isa(' cvars{i} ',''panel'')']);
        catch erri
        end
        if foundpanel
            break;
        end
    end