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d7932a2709
Since libjpeg-turbo does not support Exif, the only way it can embed density information in a JPEG image is by using the JFIF marker, which is only written if the JPEG colorspace is YCbCr or grayscale. (Referring to the conversation under #793, we may need to further restrict that to 8-bit-per-sample JPEG images, because the JFIF spec requires 8-bit data precision.)