I'm testing some of the JPEG and JPEG2000 features of IPP 6.0 update using the Picnic app. If I open the resultant files in Photoshop, the dpi is always 72 dpi and the wrong size. For instance a 4inch x 4inch 300dpi JPEG saved out of Picnic shows in Photoshop as 72 dpi and a width and height of 16.667 inches. Is there meta data that defines the dpi ?
I have also seen this lack of pixel size (dpi) meta data handling in IPP (all versions) with Jpeg and Jpeg2000. I had to patch the IPP samples source code to add load/save of pixel size; and with each new IPP samples update, I must redo the patching.
I have also added this issue as a Premier Support item, but it has now been there as a feature request for several years.
I really think IPP should support this because both Jpeg and Jpeg2000 (and Jpeg XR) has meta fields for it.