Missing Photoshop IRB types (8BIM, PHUT, DCSR, AgHg)
The assumption that image resource blocks (IRB) in JPEG (APP13) and PSD images always start with type designator "8BIM" is wrong. An image with a valid IRB introduced by type designator "AgHg" was found. Writing metadata to such an image leads to error message "Input data does not contain a valid image" in case of JPEG and "This does not look like a Photoshop image" for PSD images. This finding was verified against exiftool sources, which in addition to the common "8BIM" list "PHUT", "DCSR" and "AgHg" as IRB type designators that have been found in rare cases.
A patch and appropriate test cases will be provided and committed ASAP.
#800: Added and unified support for multiple IRB types (8BIM, AgHg, DCSR, PHUT) in JPEG and PSD images
Updated by Andreas Huggel almost 10 years ago
Thanks, Michael and Volker for a very complete fix! Especially for also updating the tests. Only issue I have with the change is that it breaks the binary compatibility of the upcoming release. What if we keep bimId_ in jpgimage.hpp for the time being and just mark it as obsolete?