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English
Brighter images have more brighter pixels, therefore the bars in the right are higher than that in the left.
Darker images have more darker pixels, therefore the bars in the left are higher than that in the right.
In addition, if we take a look at the two images below:
Image 1 | Image 2 |
We notice that in Image 1, there is higher contrast between the brighter and darker part of the image; that is, bright and dark pixels occupy a larger portion of the total image pixels. Therefore, in the histogram, there are higher bars in the left (darker side) and right (brighter side), while the bars are much lower relatively in the center. This implies that there are only a few midtone pixels in the image.
In image 2, pixels in objects have more brightness and darkness levels, and the distribution is more even than that in Image 1. Therefore, the brighter, midtone and darker pixels share evenly the total pixels in the image, which makes the histogram for Image 2 look smoother.
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