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4 changes: 3 additions & 1 deletion docs/histogram/histogram.rst
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Histograms
==========

Histograms are
A histogram is a graphical representation of the intensity distribution of pixels in an image. It provides valuable insight into the image's tonal range, color balance, and contrast.

Grayscale histogram
-------------------

For grayscale images, each pixel intensity value ranges from 0 (black) to 255 (white). The histogram shows the number of pixels for each intensity value.

The ``calcHist`` function takes these arguments::

cv.calcHist([img], channels, mask, bins, ranges)
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