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Old Jun 11, 2010, 6:11 PM   #1
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Default Brightness Histogram?

My camera calls it a birghtness histogram and Im not sure that thats the actual name for it but its the black and white graph that i guess graphs out the contrast or white balance or something. Anyway what is it really? How do you read it? How is it suppose read when the image is correct?

And how do I put images into these forums? Do I have to put them on another website first and then on here?
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Old Jun 11, 2010, 7:30 PM   #2
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The Histogram is a column chart of the number of pixels in an image at varying levels of brightness. On the left is Black, on the right is white, and everything in the middle is the other levels of brightness. See Understanding Histograms.

To post images here, see How I post a photo to the forum
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Old Jun 11, 2010, 7:47 PM   #3
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There really is not a 'correct' histogram, as such. The histogram is simply telling you how much of the picture has a given brightness value. This is dependent on the lighting of the scene. However, if the histogram is 'crowded' to one side or the other, it means your picture is going to be very dark or very light. By adjusting the exposure, you can move the peaks one way or another.
On cameras which have a live histogram, it is a good way to judge exposure, and watch it change as you vary the shutter speed and aperture. I use the feature on my Minolta, and like it a lot.

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