MATLAB: Avoid colorbar resizing image

axescolorbarimage resize

Hi guys –

How can I prevent an image from being resized when a colorbar is introduced? I am plotting two plots side by side, one with a line plot and one with imagesc. Before the colorbar is added the plots are exactly the same size, which I would prefer, but when I add the colorbar the imagesc plot is resized to be smaller than before. I'd like to avoid this.

Best Answer

Jason, just try this demo code and I think all your questions will be answered:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
workspace;  % Make sure the workspace panel is showing.
fontSize = 20;
format compact;
% Put up a plot in the first position
h1 = subplot(1,2,1);
plot(rand(15), 'LineWidth', 3);
title('Line Plot', 'FontSize', fontSize);
% Get the current axis size

originalSize1 = get(gca, 'Position')
% Put up an image in the second position
% Read in a standard MATLAB gray scale demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
baseFileName = 'cameraman.tif';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
grayImage = imread(fullFileName);
% Display the original gray scale image.
h2 = subplot(1, 2, 2);
imshow(grayImage, []);
title('Original Grayscale Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]); % Maximize figure.
set(gcf,'name','Demo by ImageAnalyst','numbertitle','off');
% Get the current axis size
originalSize2 = get(gca, 'Position')
uiwait(msgbox('Click OK to see a colorbar and watch how it changes both axes sizes'));
colormap('winter');
colorbar;
title('Shrunken Image with ColorBar', 'FontSize', fontSize);
% Print out the new sizes and see how they are different.
newSize1 = get(h1, 'Position')
newSize2 = get(h2, 'Position')
uiwait(msgbox('Click OK to restore the original image size'));
% Reset axes to original size.
set(h1, 'Position', originalSize1); % Can also use gca instead of h1 if h1 is still active.
set(h2, 'Position', originalSize2); % Can also use gca instead of h2 if h2 is still active.
title('Restored Image with ColorBar', 'FontSize', fontSize);
% Print out the restored sizes to verify.
restoredSize1 = get(h1, 'Position')
restoredSize2 = get(h2, 'Position')

Related Solutions

MATLAB: How to display the input image, after when the threshold values exceeds certain limit

It's just 3 lines. Just mask the original image:

binaryImage = grayImage > 150;
maskedImage = zeros(size(grayImage)); % Initialize.

maskedImage(binaryImage) = grayImage(binaryImage);

See the full demo below:

% Demo by ImageAnalyst
clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables.
workspace;  % Make sure the workspace panel is showing.
fontSize = 14;
% Read in a standard MATLAB gray scale demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
baseFileName = 'coins.png';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
% Check if file exists.
if ~exist(fullFileName, 'file')
  % File doesn't exist -- didn't find it there.  Check the search path for it.
  fullFileName = baseFileName; % No path this time.
  if ~exist(fullFileName, 'file')
    % Still didn't find it.  Alert user.
    errorMessage = sprintf('Error: %s does not exist in the search path folders.', fullFileName);
    uiwait(warndlg(errorMessage));
    return;
  end
end
grayImage = imread(fullFileName);
% Get the dimensions of the image.  
% numberOfColorBands should be = 1.
[rows columns numberOfColorBands] = size(grayImage);
% Display the original gray scale image.


subplot(2, 2, 1);
imshow(grayImage, []);
title('Original Grayscale Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% Give a name to the title bar.
set(gcf,'name','Demo by ImageAnalyst','numbertitle','off') 
% Let's compute and display the histogram.
[pixelCount grayLevels] = imhist(grayImage);
subplot(2, 2, 2); 
bar(pixelCount);
grid on;
title('Histogram of original image', 'FontSize', fontSize);
xlim([0 grayLevels(end)]); % Scale x axis manually.
yl = ylim();
line([150 150], [0 yl(2)], 'Color', 'r');
% Threshold at 150
binaryImage = grayImage > 150;
% Display the original gray scale image.
subplot(2, 2, 3);
imshow(binaryImage, []);
title('Binary Image', 'FontSize', fontSize);
% Mask the image
maskedImage = zeros(size(grayImage)); % Initialize.
% Assign values from grayImage that are > 150.
maskedImage(binaryImage) = grayImage(binaryImage);
% Display the original gray scale image.
subplot(2, 2, 4);
imshow(maskedImage, []);
title('Masked Image', 'FontSize', fontSize);

MATLAB: How can we get back our original image after jumbling. Is there any reverse method in matlab?

you can only do this when you also have stored information on the indices that were used for the shuffling.

for example if you would have used sort on your matrix

[Asorted, idx] = sort(A);

than you could get the original A back by

Aorg = Asorted(idx);

If you did not store this information, than it is not possible to "reverse" anything in matlab

Best Answer

Related Solutions

MATLAB: How to display the input image, after when the threshold values exceeds certain limit

MATLAB: How can we get back our original image after jumbling. Is there any reverse method in matlab?

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