Canon EOS 1D - Manual (Page 59)

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You can set the image size (recorded pixels), image type (JPEG or
RAW), and JPEG quality (compression rate).
3 /4/5/6 will record the image as a JPEG image. In the 1/K1/
61 mode, the image will require processing with the software
provided.
You can set the image size in one of the two ways below.
Using the Rear LCD Panel to Set the Image Size
1
Press the <B> button. (9)
Press the button once or
twice to display the card and image
size on the rear LCD panel.
2
Select the image size.
Turn the <5> dial to select the
image size.
If 1/K1/61 and 3/4/5/6 are
displayed at the same time, the RAW
and JPEG image will be recorded
simultaneously on the card.
Turn the <6> dial to select the card
to record or playback images (p.56).
Setting the Image-recording Quality
Selecting the Image Size
Image size/Card z WB
When [Record func.] is set to [Rec. separately] (p.57), turn the <6> dial
to select the card and set the image size for the respective card.
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