image is too big to fit in the screen (MATLAB)

I know that it is just a warning and it will not affect the code .. but my problem is that I need to show the image in its real siz开发者_C百科e without any zooming out .. is that possible in imshow function are there any parameters that do this?

thank you all

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The solution given by @Jonas, which I already upvoted, is really good. Let me suggest some minor improvements so that it handles the case when the figure is resized:

%# read an image and make it large
img = imread('autumn.tif');
img = repmat(img, [10 10]);

%# new figure
hFig = figure;

%# try show image at full size (suppress possible warning)
s = warning('off', 'Images:initSize:adjustingMag');
imshow(img, 'InitialMagnification',100, 'Border','tight')
warning(s);

%# handle figure resize events
hAx = gca;
set(hFig, 'ResizeFcn',{@onResize,hAx})

%# call it at least once
feval(@onResize,hFig,[],hAx);

%# enable panning tool
pan on

the following is the resize callback function:

function onResize(o,e,hAx)
    %# get axes limits in pixels
    oldUnits = get(hAx, 'Units');    %# backup normalized units
    set(hAx, 'Units','pixels')
    pos = get(hAx, 'Position');
    set(hAx, 'Units',oldUnits)       %# restore units (so it auto-resize)

    %# display the top left part of the image at magnification 100%
    xlim(hAx, [0 pos(3)]+0.5)
    ylim(hAx, [0 pos(4)]+0.5)
end

You could probably improve this further so that when you resize the figure, you don't always go back to the top-left corner, but maintain the current position.

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One solution that should work is to display the image and then change the axes limits so that there is one screen pixel for every image pixel:

%# read an image and make it large
img = imread('autumn.tif');
img = repmat(img,[10,10]);

%# turn off the warning temporarily, we're going to fix the problem below
%# Note that in R2011b, the warning ID is different!
warningState = warning('off','Images:initSize:adjustingMag');
figure
imshow(img)
warning(warningState);


%# get axes limits in pixels
set(gca,'units','pixels')
pos = get(gca,'position')

%# display the top left part of the image at magnification 100%
xlim([0.5 pos(3)-0.5]),ylim([0.5 pos(4)-0.5])

Now you can select the hand (pan tool) and move the image around as needed.

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Note: To centre the image (instead of showing its top left), use

    xlim([(w_image - w_window) / 2, (w_image + w_window) / 2]);
    ylim([(h_image - h_window) / 2, (h_image + h_window) / 2]);

where w_image and h_image are the image's dimensions, and w_window and h_window are the above answers' pos(3) and pos(4), respectively.