Canon EOS 1300D - Manual (Page 91)

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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 EOS
software, such as Digital Photo Professional (p.314). 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 be viewed or
printed even with a computer which does not have the EOS software
installed.
1
1 +73
1 image
73 image
0001 . CR2
0001 . JPG
File number File extension
RAW Image Processing Software
 To display RAW images on a computer, using Digital Photo Professional
(DPP, EOS software) is recommended (p.314).
 Previous versions of DPP Ver.4.x cannot process RAW images taken
with this camera. If a previous version of DPP Ver.4.x is installed on your
computer, obtain and install the latest version of DPP from the Canon
website to update it (p.315). (The previous version will be overwritten.)
Note that DPP Ver.3.x or earlier cannot process RAW images taken with
this camera.
 Commercially-available software may not be able to display RAW
images taken with this camera. For compatibility information, contact the
software manufacturer.