Turns out, that CKFinder will resize any uploaded image to 1600x1200 if the image is larger than that. This is doubtful feature of CKFinder (seeĀ http://docs.cksource.com/CKFinder_2.x/Developers_Guide/PHP/Configuration/Images) that is also enabled in default configuration.

Solution

Don't let CKFinder to change uploaded images.

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