MATLAB: Plotting histogram of image data present in a stack

Question

Hi All,

I have looked at the examples shown here to underetand how to plot histogram of a single image data. But

it's not clear to me how the data in a stack can be plotted.

For exmaple, I tried

f = "Test_Image.tiff";
img_data = imfinfo(f);
imhist(img_data)

test_image stack.

This returns

double, uint8, int8, logical, uint16, int16, single, uint32, int32
Instead its type was struct.

Any suggestions?

Answer 1

iminfo just read the metadata of the image. Use imread() to read the image as matrix

f = "Test_Image.tiff";
img_data = imread(f);
imhist(img_data)

If it is an rgb image, then first convert it to grayscale too

f = "Test_Image.tiff";
img_data = rgb2gray(imread(f));
imhist(img_data)