Canon EOS Rebel SL1 18-55mm IS STM Lens Kit - Manual (Page 97)

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3 Setting the Image-Recording Quality
1 is the raw image data before it is made into 73 or other images.
1 images cannot be viewed on a computer without the use of
software, such as Digital Photo Professional (provided, p.366).
However, you can perform various adjustments on them that are
impossible with other image types such as 73. 1 is effective when
you want to precisely adjust the image yourself or shoot an important
subject.
1 +73 records a 1 image and a 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 also be viewed or
printed from computers on which the software provided with the camera
is not installed.
1
1 +73
File number File extension
0001 . CR2 1 image
73 image 0001 . JPG
We recommend the use of the provided software in order to view RAW
images on a computer. Commercially-available software may not be able to
display RAW images. To see if RAW images taken with this camera are
compatible with other software, consult with the respective software
manufacturer.
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