Similar to Auto Exposure Bracketing, White Balance Shift/Bracket can
produce from one to three color variations from a single exposure. It’s an
interesting feature because you don’t need to shoot a bracket set, which
means that if you routinely like your images a little warmer or cooler,
or a little more yellow or green, you can set the screen where you wish.
From the moment the feature is engaged, all of your images will exhibit
the color change, regardless of which white balance mode you are in,
including Custom White Balance.
To access this feature, open the Menu and select WB Shift/Bracket.
Entering that screen will get you what is, essentially a color chart that you
can navigate through to select either a Blue/Amber or Magenta/Green
bias
On the 30D, 5D and Mark III, you’ll use either the Main Dial or the Quick
Control Dial (the Rebel doesn’t have a Quick Control Dial) to select the
number of bracketed images. Use the Multi-Controller to position the
bias where you want it.
Color Space/Color Matrix
Color Space determines the number of colors that will be recorded (the
“gamut”) when a picture is taken. Adobe RGB (1998) is a wide gamut,
recording a very large range of colors. Photographers who photograph
for mechanical reproduction on a press (books, catalogs, brochures)
should use the Adobe RGB color space so that, when those colors
are converted to the very small CMYK reproduction gamut the most
information possible will be retained.
For almost all other uses, weddings, portraits, snapshots and the like, the
smaller gamut sRGB is all you need. Some have decried the sRGB color
space as inadequate, which I don’t believe to be true for a number of
reasons. For instance, all labs use sRGB printers almost exclusively. From
the 1-hour photo kiosk at the mall to the large machines at your pro
lab, the sRGB color space is what the machines prefer (only a very few
printers, are able to make use of Adobe RGB color space). In fact, your lab
may add charges to your bill should you provide them with RGB fi les that
they will have to convert.
Additionally, the Internet is an sRGB environment and doesn’t treat
Adobe RGB images kindly. Putting an Adobe RGB image on the web will
fl atten some colors and make it look, well, bad.
Finally, your computer monitor, either CRT or LCD, is an sRGB device and,
as such, is incapable of seeing all the colors in the Adobe RGB space. At
the moment, there are very few monitors that even claim to be Adobe
RGB compatible, fewer still that can live up to the claim
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EOS bodies off er your choice of Adobe RGB or sRGB but also off er a
second system, Picture Styles (described elsewhere) to change the visual
characteristics of the fi nal image.
Early EOS-1 bodies off er fi ve diff erent designations, similar to Picture
Styles but using older logarithms, found under Color Matrix. Four of the
fi ve are sRGB color spaces, engineered to render images that mimic a
number of classic fi lm emulsions. Newer EOS bodies, currently the Rebel
XTi, 30D, 5D and 1D Mark III, off er the aforementioned Picture Styles.
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