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It seems that GIMP is not able to guess the appropriate compression settings for your photos and artificially boosts the "quality". Don't let the "Use quality settings from original image" option deceive you. Unless the original JPEG is saved by the same library (and in your case, it is not, because it was produced by the camera firmware) ...


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A difference between the settings used by GIMP and your digital camera likely explains the change in file sizes you're seeing. By default, GIMP appears to export JPEGs with quality 97 without subsampling. Many older digital cameras may use quality settings around 80-90 with subsampling. Using the first photo I encountered on my computer, saving with Q=90 + 4:...


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