Plotting Grayscale from .csv with colorbar restriction
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Hi there,
Can anyone please help..? I have grayscale image data in a .csv file I need to plot. The values in the .csv are the z values that I wish to plot as an image, the x and y coordinates of the z values in the file represent the location of that pixel in the image.
I need to restrict the colorbar to say 0 to 0.5 to see the detail in the certain part of the image. Everything below 0 can be black, above 0.5 can be white, but I need 0-0.5 to be greyscale.
I have plotted using the following code but what I get is a mostly blank image.
Please can someone help? I attach the data and my plot.
filename = 'C:\\my data.csv';
M = csvread(filename)
J = contourf(M)
colormap gray
h = colorbar;
set(h, 'ylim', [0 0.5])
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