Why is imhist() not clipping data?

I can't seem to find out why that imhist plots aren't clipping the data. Or why the color bar is inside of the plot.

figure, sgtitle(strcat('Number of intensity levels = ',string(n_lvls)))
subplot(2,2,1), imshow(og_img), axis image, title('Original small matrix')
subplot(2,2,2), imhist(og_img), ylim([0 1000]), title('Original Image Histogram')

subplot(2,2,3), imshow(histeq(og_img)), axis image, title('Histogram equalized')
subplot(2,2,4), imhist(histeq(og_img)), title('Histogram equalized image histogram')

[Adam Danz]

Could you provide the necessary data so we can attempt to reproduce this?

Also, whenever you report a problem like this, always include the software version number. (see ver).

You may also want to review, https://www.mathworks.com/help/matlab/creating_plots/resolving-low-level-graphics-issues.html

Answer 1

[Image Analyst]

This works fine for me

og_img = imread('cameraman.tif');
n_lvls = 100;
figure, sgtitle(strcat('Number of intensity levels = ',string(n_lvls)))
subplot(2,2,1), imshow(og_img), axis image, title('Original small matrix')
subplot(2,2,2), imhist(og_img)
% ylim([0 1000])
title('Original Image Histogram')

subplot(2,2,3), imshow(histeq(og_img)), axis image, title('Histogram equalized')
subplot(2,2,4), imhist(histeq(og_img)), title('Histogram equalized image histogram')

Why are you calling ylim?

[Zackary Coburn]

Sorry, I uploaded the code with ylim unintentionally. I was trying to troubleshoot the problem with that. The image I uploaded was the output without ylim in the code.

This is another example code and I am using R2020b.

clc, clear, close all

Eye = imread('DR_eyeball.jpg');
Eye_gray = rgb2gray(Eye);
figure, sgtitle('Grayscale and Histogram Equilization')
subplot(2,2,1), imshow(Eye_gray), axis image, title('Original Grayscale')
subplot(2,2,2), imhist(Eye_gray), title('Original Grayscale Histogram')

[Image Analyst]

It appears sgtitle() is causing the gray scale wedge to appear in the wrong place. I'll contact the Image Processing team developers about it. If you take out sgtitle() it seems to work fine.

[Zackary Coburn]

Oh ok. Thank you. And about the clipping, if I change the Clipping Style to 'rectangle' from '3dbox', then the data is properly clipped in the plot.