While
reviewing images on the rear screen of your camera can sometimes be enough to
assess whether the exposure is correct or not, it should only be used as a
rough guide-surrounding lighting conditions can distort what you seen on
screen, and on bright days, can make it hard to see the screen at all.
The
best way to check exposure when you're reviewing your images is to review the
histogram for the image. The histogram is a graphical interpretation of the
image, showing the spread of tones - the left hand side showing the darkest
areas, while the right hand side shows the light areas.
There's
no such thing as a good or a bad histogram - it simply shows you the tonal
range of the image. A well - exposed image will have peaks that are evenly distributed
across the image, while overexposed shot will have the graph clumped over to
the right - hand side, with the opposite being the case for an underexposed
shot.
For
high-key and low-key shots, where a bias toward light or dark is desired, then
an evenly distributed graph is undesirable - a low-key shot with plenty of dark
areas should have the graph bunched up on the left-hand side, for example.
Most
cameras, when reviewing images, will bring up a histogram for the image so that
you can quickly assess you self whether the images is exposed correctly.
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