Two figures, same colormap stretch

Hello,

I have two matrices of image data that I would like to plot in grayscale. The first image is before any image processing and the second is after i have preformed the image processing.

The problem I am having is that I want to use imagesc() on both of the images, but this will result in two different color scales.

I want to plot both images on different figures using the same colormap scale so that I can show the improvement in the variance across the image.

Thanks for your help,

I am a matlab novice, so step by step instructions would be amazing help to me.

Answer 1

[Image Analyst]

Call colormap(gray) after you call imagesc or imshow.

grayImage1 = imread('moon.tif');
imagesc(grayImage1);
colormap(gray);
colorbar;

figure;
grayImage2 = imread('cameraman.tif');
imagesc(grayImage2);
colormap(gray);
colorbar;

[Jacob Brinkmann]

This wont affect the dynamic range of the colormap, though. If I were to use your answer, wouldn't differing values between the images be plotted to the same color?

I have data that ranges maybe from [50-100] and the other data ranging from [40-150]. I want to use the same image scaling from the larger dynamic range for the image that has a smaller dynamic range.

Does that make more sense? Thanks for your response to my inquiries.