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In a recent discussion on the German Olympus forum I read that the camera applies geometry conversions to images when converting them to JPEG. I wasn't aware of that, so I tried it out. Here images taken with my E-30 with the Zuiko Digital ED 12-60mm F2.8-4.0 SWD at focal lengths of 60 mm (first set) and 12 mm (second set). I chose this lens because I know that it has significant barrel distortion at the short end at close quarters. The test chart is of A4 size, and the short focal length images were taken from about 32 cm distance.

In each group, the first image shows the raw image converted by DxO Optics “Pro” without any correction. The second image is the JPEG from the camera, again with no corrections. The third image is the raw image, again processed by DxO, but with geometry corrections. Run the cursor over each image to see the difference from the following image. Click on an image for progressively larger versions, up to original resolution (4032×3024).


This should be Test-2-orig.jpeg.  Is it missing?
Image title: Test 2 orig          Dimensions:          4032 x 3024, 1072 kB
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All images taken on Thursday, 22 August 2013, thumbnails          All images taken on Thursday, 22 August 2013, small
Diary entry for Thursday, 22 August 2013 Complete exposure details

 
This should be Test-2-JPEG.jpeg.  Is it missing?
Image title: Test 2 JPEG          Dimensions:          4032 x 3024, 944 kB
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All images taken on Thursday, 22 August 2013, thumbnails          All images taken on Thursday, 22 August 2013, small
Diary entry for Thursday, 22 August 2013 Complete exposure details

 
This should be Test-2-DxO.jpeg.  Is it missing?
Image title: Test 2 DxO          Dimensions:          4032 x 3024, 992 kB
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All images taken on Thursday, 22 August 2013, thumbnails          All images taken on Thursday, 22 August 2013, small
Diary entry for Thursday, 22 August 2013 Complete exposure details

 


This should be Test-3-orig.jpeg.  Is it missing?
Image title: Test 3 orig          Dimensions:          4032 x 3024, 1088 kB
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All images taken on Thursday, 22 August 2013, thumbnails          All images taken on Thursday, 22 August 2013, small
Diary entry for Thursday, 22 August 2013 Complete exposure details

 
This should be Test-3-JPEG.jpeg.  Is it missing?
Image title: Test 3 JPEG          Dimensions:          4032 x 3024, 992 kB
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All images taken on Thursday, 22 August 2013, thumbnails          All images taken on Thursday, 22 August 2013, small
Diary entry for Thursday, 22 August 2013 Complete exposure details

 
This should be Test-3-DxO.jpeg.  Is it missing?
Image title: Test 3 DxO          Dimensions:          4032 x 3024, 1008 kB
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All images taken on Thursday, 22 August 2013, thumbnails          All images taken on Thursday, 22 August 2013, small
Diary entry for Thursday, 22 August 2013 Complete exposure details

 

As can be seen, the only difference between the raw and JPEG images from the camera is that, for some reason, the JPEG is cropped differently. There is no evidence whatsoever of geometry correction. DxO does better, but there's still some barrel distortion evident in the second image.


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