September 2008
Beginner to intermediate
288 pages
9h 36m
English
Content preview from The Canon EOS Digital Rebel XSi/450D Companion
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ADVANCED EXPOSURE
USING THE HISTOGRAM
159
Again, there are no right or wrong histogram shapes. Nor are there right or wrong
distributions across the histogram. However, the histogram can be a very useful
tool for spotting over- or underexposure, as well as contrast range. An image with
more contrast has more tones across the histogram that I can brighten or darken
in my editing program, and that means I’ll have more latitude to make changes
later.
e ree-Channel Histogram
If you press the DISP button one more time after seeing the first histogram, you’ll
get to the second histogram page.
e XSi’s three-channel histogram display shows a separate histogram for the red,
green, and blue information in your image.
is page shows the same histogram you saw before, along with an additional
three-channel histogram. In Chapter 5 you learned that an image is made up of
three separate channels of color information: one red, one green, and one blue.
e three-channel histogram lets you see a separate histogram for each of these
channels.
is can sometimes be useful for spotting white balance troubles that could oth-
erwise be difficult to see on the camera’s LCD screen. In an image with good white
balance, all three channels are usually fairly “registered.” at is, they’re often very
similar. Obviously, if you’re shooting a still life of separate red, green, and blue
Christmas ornaments, then
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.