Canon EOS T4i / 650D Ken McMahon, August 2012

Canon Rebel T4i / EOS 650D JPEG vs RAW

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To compare real-life performance between RAW and JPEG files on the Canon Rebel T4i / EOS 650D, I shot this scene in the camera's RAW plus Large Fine JPEG mode enabling me to compare images created from exactly the same data. The sensitivity was set to 100 ISO and the aperture to f8.

The JPEG was processed using the in-camera defaults, while the RAW file was processed using the supplied Canon Digital Photo Professional software using the default settings. Once the T4i / 650D is supported in Adobe Camera RAW I'll publish some more comparisons.

  Canon T4i / EOS 650D results
1 Canon T4i / EOS 650D Quality
2 Canon T4i / EOS 650D RAW
3 Canon T4i / EOS 650D Noise
4 Canon T4i / EOS 650D Multi-frame NR
5 Canon T4i / EOS 650D Sample images


The image above was taken with the Canon Rebel T4i / EOS 650D with the 18-135mm f3.5-5.6 IS STM kit lens.The camera was set to Aperture priority exposure mode, stabilisation was disabled for this tripod-mounted test and tone enhancement and lens correction features were left on the default settings, Auto lighting optimizer was set to standard, Peripheral illumination correction was on and Chromatic aberration correction was off.

The table below shows 100 percent crops from the in-camera JPEG file on the left and from the camera RAW file processed in DPP on the right. The in-camera JPEG measured 9.7MB and the JPEG processed from the RAW file 16.7MB using the default image quality setting of 10. I expect you could opt for a higher compression ratio, producing a smaller JPEG from the RAW file at around the same size as the in-camera JPEG, without any perceptible loss in quality.

The crops below look very similar, possibly the processed RAW crops look a fraction less contrasty than the in-camera JPEGs and they might also be a tiny bit noisier, but if there is a difference it's so slight as to be negligible. The default settings in DPP apply Luminance and Chrominance noise reduction of 20, and Unsharp mask of 3, 7 and 2 respectively for Strength, Fineness, and Threshold, so there's plenty of scope to tweak the results if you prefer something a little less punchy.

The same as for the in-camera JPEGs, Auto lighting optimizer and Peripheral illumination correction are applied by default, but Chromatic aberration correction isn't, so the quite severe fringing in crop 3 can be dealt with very effectively either way - in the camera or by processing the RAW file. See my example on the intro page for the improvement this new feature makes. It's certainly worth activating if you're shooting on one of the JPEG image quality settings.

To find out how they compare at higher sensitivities see my Canon T4i / EOS 650D noise results.


Canon Rebel T4i / EOS 650D in-camera JPEG
Canon Rebel T4i / EOS 650D RAW default processing
f8, 100 ISO
f8, 100 ISO
f8, 100 ISO
f8, 100 ISO
f8, 100 ISO
f8, 100 ISO
f8, 100 ISO
f8, 100 ISO

Canon Rebel T4i / EOS 650D results : Quality / RAW vs JPEG / Noise
/ Multi-frame NR

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