scaling the dimensions of subplots

How can I plot the following three images so that they individually maintain the same aspect ratio, but they are the same size in the horizontal direction. It represents a scan over a sample in which there are 3 individual scans making up the composite. As there are 6 large square features in the vertical I thought creating a subplot with 6, and using the example attached would work, but clearly its not scaling properly.

[Jason]

Just for clarity, I want it to look like

[Geoff Hayes]

Jason - how are you generating the three images for each subplot? You also state in your question ..and using the example attached would work... Did you mean to attach something to your question?

[Jason]

Hi Geoff. By attachement I meant the picture. Each of the 3 subplots is a result of a montage of lots of other images. I have 3 cameras and each one images a different length of a chip but the same width. All my other questions regarding montages are for each of the cameras, now I want to display the overall scan with all cameras.

[Bruno Pop-Stefanov]

Would you mind attaching the images to the post so we can try on our end? Are you using imagesc in each subplot?

[Jason]

Each of the three subplots above is from a different camera. See below. Each camera captures a different number of "Areas" but each area is always 6 thumbnails wide. So camera 1 collects 2 areas, camera 2 collects 3 areas and camera 3 collects 1 area. Due to memory, I always create the individual montage for a given camera, then have a button to add this to the relevant position on a seperate figure - which is to represent the composite image (as shown above, so the image below would be at the top of the "composite image". As each individual montage is created on a uipanel and of fixed width, I cannot see why adding this to the composite image using subplot why it then changes the dimensions (as now the widths are slightly different). I have tried to save my images as jpgs, but get an error

Error using writejpg>set_jpeg_props (line 183) UINT16 image data requires bitdepth specifically set to either 12 or 16.

% create a montage of size mxn
   allImgs = cell(m,n);

     hAxes = [];
     hAxes = findobj('Parent',handles.uipanelM,'Type','axes');
     %hAxes = get(handles.CanvasPlot)  

     hAxes2  = flipud(hAxes);   
     hAxes2D = reshape(hAxes2,[6 m])';
     %hImg([6 8]) = findobj('Parent',hAxes2D,'Type','image')

     for u=1:m
      for v=1:n
          hImg = findobj('Parent',hAxes2D(u,v),'Type','image');
          allImgs{u,v} = get(hImg,'CData');    

      end
   end

   %figure(hFig);
   figure(findobj('Name','ALL CAMERAS'))
   montageImg = cell2mat(allImgs);
   imwrite(montageImg,'C:\image.jpg')

[Geoff Hayes]

For the error, just set the bit depth to 12

 imwrite(montageImg,'C:\image.jpg','BitDepth',12);

When I tried the same for bit depth of 16, I observed the error

 Only grayscale images supported with 16 bit data.

[Jason]

hmmm. It saved OK but was unable to open the image using normal windows viewers. It says its too large - 83MB.

[Geoff Hayes]

I just tried something similar on my Mac, and couldn't open the 16-bit test image in the usual viewer.

What then is your code to display the images in the three subplots? You've shown what code you have used to build the three subplots (in your first image), but how are you putting the image in them? What function are using - image, images, etc.?

[Jason]

I use the following code for each image to create the montage.

IM = imread(f);
       IM=imrotate(IM,angle);                        
       x=(width+0.0005)*(index-(row*step)-1);  %width, row, step for montaging 
       positionVector = [os+x, y, width, 0.08];
       hp = handles.uipanelM;
       h=subplot('Position',positionVector,'Parent',hp); %to enable deleting use handles
       % update handle array
       hSubplots = [hSubplots ; h];   %Concatenate
       axis off;
       hold off;

         IM1 = impyramid(IM, 'reduce');   %downsample by 2 for montage (but not zoomed in image
         Im_Scale(IM1,4000);

[Jason]

Sorry...forgot to include my function Im_Scale

 function Im_Scale(Image,Scale)

    imagesc(Image,[0 Scale])
    %imagesc(Image,[500 2000])
    colormap (jet);
    axis off;
    set(gca,'ytick',[]);
    set(gca,'xtick',[]);
    drawnow;