Canon Rebel T2i EOS 550D Instruction Manual page 74

3 Setting the Image-recording Quality
About 1
1 is the raw image data before it is made into 73 or other images.
Although 1 images require software like Digital Photo Professional
(provided) so they can be displayed on the computer, they also offer flexibility
for image adjustments possible only with 1. 1 is effective when you
want to precisely adjust the image yourself or shoot an important subject.
About 1+73
1+73 records both a 1 and 73 image with a single shot. The two
images are saved to the card simultaneously. The two images will be saved
in the same folder with the same file numbers (file extension .JPG for JPEG
and .CR2 for RAW). 73 images can be viewed or printed even with a
computer which does not have the camera's provided software.
1, 1+73 and [7 Custom Functions (C.Fn)] menu's
[High ISO speed noise reduction]
Although the [7 Custom Functions (C.Fn)] menu's [High ISO speed
noise reduction] (p.193) settings (Standard/Low/Strong/Disable) are
applied to the recorded images, the images are displayed without noise
reduction during image playback (on the LCD monitor and on a TV screen)
or direct printing. (Noise may be noticeable in the images.) You can check
the noise reduction effect or print noise-reduced images with Digital Photo
Professional (provided software).
Commercially-available software might not be able to display RAW images.
Using the provided software is recommended.
74
1
image
73
image
File number
0001 . CR2
0001 . JPG
File extension