Sony DSLR-A290L Instruction Manual - Page 100
How to check the histogram, right side. If the exposure compensation
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How to check the histogram The histogram displays the luminance distribution that shows how many pixels of a particular brightness exist in the picture. To display the histogram, press DISP on the control button (page 94). When the image has a high-key or lowkey portion, that portion is flashed on the histogram display (Luminance limit warning). Number of pixels Dark Light Flashing R (Red) Luminance The exposure compensation will change the histogram accordingly. The right illustration is an example. Shooting with the exposure compensation on the positive side brightens the whole picture, making the entire histogram shift to the bright side (right side). If the exposure compensation is applied on the negative side, the histogram will shift to the other side. Both ends of the histogram show a highkey or low-key portion. It is impossible to restore these area with a computer later. Adjust the exposure if necessary and shoot again. 100 G (Green) B (Blue)