Canon 450D Посібник - Сторінка 16
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18
Part I
Using the Rebel XSi/450D
XSi/450D applies to RAW files are aperture,
ISO, and shutter speed. Other settings such
as White Balance, Picture Style, and so on
are "noted," but not applied to the file. As a
result, you have control over how image
data is rendered during image conversion.
The RAW conversion process takes only a
few additional minutes, and then you can
save the image in a lossless file format.
RAW files are denoted with a .CR2 filename
extension. After converting the RAW data,
you save the image in a standard file format
such as TIFF or JPEG and work with it as you
do with other image files.
On the XSi/450D, you can choose to shoot
either RAW images or RAW+JPEG, which
records the RAW file and Large JPEG image.
The RAW+JPEG option is handy when you
want the advantages of having the flexibility
that you get with a RAW file, and you also
want a JPEG image to quickly post on a Web
site or to send in an e-mail.
Because RAW is a lossless format (no loss of
image data), image quality is not degraded
by compression. However, you can store
fewer RAW images than JPEG images on the
media card.
With this overview of the differences
between image quality settings and file for-
mat, you're in a better position to choose the
setting that best suits your needs. The image
quality settings depend on the shooting
mode you choose.
In Basic Zone shooting modes such as
Portrait, Landscape, and so on, the camera
automatically sets the file format to JPEG,
but you can set image size and compression
level. In Basic Zone modes, you can't select
the RAW format.
In Creative Zone modes — P, Tv, Av, M, and
A-DEP — you can select any of the JPEG
options as well as RAW or RAW+JPEG.
To set the image quality in both Basic and
Creative Zone modes, follow these steps:
1.
Turn the Mode dial to a Basic
Zone mode. Basic Zone modes are
indicated by icons such as a per-
son's head for Portrait mode,
mountains for Landscape mode,
and so on.
2.
Press the Menu button, and
then turn the Main dial to select
the Shooting 1 (red) menu, if
necessary.
3.
Press the down cross key to
select Quality if it isn't already
selected.
4.
Press the Set button. The Quality
screen appears with the currently
selected quality setting displayed
along with the image dimensions
in pixels.
5.
Press the down cross key to
select the size and quality that
you want. In Basic Zone modes,
you can choose only JPEG options
at different levels of compression.
A solid quarter circle icon indicates
a low compression level. A jagged
quarter circle icon indicates a
higher compression level.
6.
Press the Set button.
7.
Turn the Mode dial to a Creative
Zone mode.
8.
Repeat steps 2 through 6 to set
the quality for Creative Zone
modes. In these modes, you can
also choose RAW or RAW+JPEG file
formats.