MATLAB Central Newsreader - different size subwindows?

different size subwindows?

David Doria — Sun, 05 Oct 2008 22:18:02 -0400

Original = imread('../lena.bmp');
nearest = imresize(Original, 2, 'nearest');
figure
spax1 = subplot(1,2,1); imshow(Original)
spax2 = subplot(1,2,2); imshow(nearest)

I would expect the image on the right to be twice as large as the image on the left, but they are displayed the same size. The variables contain twice as many pixels, so why isn't this reflected in the display?

Thanks,
Dave

Re: different size subwindows?

Jan Simon — Mon, 06 Oct 2008 10:02:02 -0400

Dear David Doria!

> Original = imread('../lena.bmp');
> nearest = imresize(Original, 2, 'nearest');
> figure
> spax1 = subplot(1,2,1); imshow(Original)
> spax2 = subplot(1,2,2); imshow(nearest)
>
> The variables contain twice as many pixels, so why isn't this reflected in the display?

The sizes of the created axes objects are determined by the SUBPLOT command. In consequence, the 2nd plot contains 4 times (not twice) more data points (not pixels) as the 1st one. Try it with a 1x1 picture!

To create larger pictures, you can adjust the POSITION property of the spax1/2 objects.

Jan

Re: different size subwindows?

David Doria — Mon, 06 Oct 2008 11:48:02 -0400

sure sure, 4x as many pixels, i mean twice as many per dimension.

So I've done something like this:

spax1 = subplot(1,2,1); imshow(Original)
spax2 = subplot(1,2,2);
set(gca, 'position',[.1 .1 .8 .6]);
imshow(nearest)

Is there not a more automatic way to do this, where it sizes them based on their size, perhaps(haha)?

Thanks,
Dave

Re: different size subwindows?

Steven Lord — Mon, 06 Oct 2008 14:00:36 -0400

"David Doria" <daviddoria@gmail.com> wrote in message
news:gcctti$58$1@fred.mathworks.com...
> sure sure, 4x as many pixels, i mean twice as many per dimension.
>
> So I've done something like this:
>
> spax1 = subplot(1,2,1); imshow(Original)
> spax2 = subplot(1,2,2);
> set(gca, 'position',[.1 .1 .8 .6]);
> imshow(nearest)
>
> Is there not a more automatic way to do this, where it sizes them based on
> their size, perhaps(haha)?

Set the Units property of spax1 and spax2 to pixels, then get their Position
properties and update the last two components of the Position based on the
sizes of the images.

Original = imread('eight.tif');
nearest = imresize(Original, 2, 'nearest');
figure
spax1 = subplot(1,2,1); imshow(Original)
spax2 = subplot(1,2,2); imshow(nearest)
set([spax1, spax2], 'Units', 'pixels')
P1 = get(spax1, 'Position');
P2 = get(spax2, 'Position');
% Assuming Original is a 2-D matrix, not a 3-D array
set(spax1, 'Position', [P1(1:2) size(Original)./2]);
set(spax2, 'Position', [P2(1:2) size(nearest)./2]);

You may also want to adjust the first two components, to "recenter" the axes
in their subplot area. Note, however, that this won't update the size of
the axes if you resize the figure. You might want to reset the Units
property to 'normalized' after the code above if that's necessary or useful
for your application.

--
Steve Lord
slord@mathworks.com