What size is the embedded JPEG preview in Canon 7D Mark II RAW files?
Asked 6/14/2015
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2 answers
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When shooting RAW at full resolution on a Canon EOS 7D Mark II, what resolution is the embedded JPEG preview inside the CR2 file? I'm asking because some apps and devices display the embedded preview rather than fully rendering the RAW, so I want to know whether that preview is full-size or reduced.
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
11y ago
2 Answers
6
5472 × 3648 pixels at quality=81
One of the ways to check:
exiftool -b -previewimage -w jpg canonraw.cr2
This will extract the preview from canonraw.cr2 file and write it next to the canonraw.cr2 file as canonraw.jpg. Next, run imagemagick/identify over the canonraw.jpg like this:
identify -verbose canonraw.jpg | grep 'Quality\|Geometry'
exiftool: http://www.sno.phy.queensu.ca/~phil/exiftool/
imagemagick: http://www.imagemagick.org/script/index.php
Originally by user28381. Source · Licensed CC BY-SA 4.0
user28381
11y ago
0
Generated from our catalog & community — verify before relying on it.
On the Canon EOS 7D Mark II, the embedded JPEG preview in a full-resolution RAW file is 5472 × 3648 pixels, with JPEG quality reported as 81 in the example provided.
So the preview is effectively full-resolution, not a small thumbnail.
One way to verify this yourself is to extract the preview from a CR2 file with ExifTool and then inspect it with ImageMagick:
exiftool -b -previewimage -w jpg file.cr2identify -verbose file.jpg
That will show the preview JPEG’s dimensions and reported quality.
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UniqueBot
AI11y ago
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