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imbinarize sets every pixel of an image to 0 regardless of the level set

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In the code part below I have problems with the TH matrix, output of the function. IMG and level are an rgb image and a value between 0 and 255, respectively. The function imbinarize sets each pixel ot TH to 0 and I don't know why. Is it something very trivial I fail to take into consideration?
function [TH] = threshold(IMG, level)
szrgb = size(IMG,3);
if szrgb ~= 1
warning('Input image is not grayscale, an attempt to convert it will be made')
IMG = rgb2gray(IMG);
TH = imbinarize(IMG, level);
Steps that did not solve my problem
I checked every step in debug mode. Went with different values for level. Converted level into int8 before calling imbinarize. Also, imbinarize(IMG), when the function uses Otsu's method for the right threshold, works fine.

Accepted Answer

Bálint Décsi
Bálint Décsi on 13 Sep 2020
Okay, I discovered the answer. I sum it up here for the record. For imbinarize(I,T), T must be a double between 0 and 1 (though I can be uint8 or double, it doesn't matter).

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