fix: IPTC fields have length limits #4568
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It escaped our notice before that the IPTC spec dictates length limits for many fields. Getting this wrong can confuse some software, including Photoshop apparently. This patch enforces length limits wherever we could figure them out from the IPTC spec -- it will simply truncate those strings that are too long before writing them to a binary IPTC tag. For this reason, we also are ending the practice of automatically translating several IPTC fields to and from what we figured were the equivalent generic metadata names. This was perhaps a dubious practice to begin with, but now the enforcement of length limits for IPTC (but not the generic metadata) makes it even more frought. There is probably nobody depending on this behavior (and maybe few OIIO users depending on IPTC support at all?), so now anybody purposely using IPTC metadata is fully responsible for setting it and dealing with any issues of whether it's "out of sync" with any other metadata that OIIO stores in or reads from a file. Fixes 4342 Signed-off-by: Larry Gritz <[email protected]>
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Just tested with my build, confirmed working great in Photoshop now! |
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It escaped our notice before that the IPTC spec dictates length limits for many fields. Getting this wrong can confuse some software, including Photoshop, apparently.
This patch enforces length limits wherever we could figure them out from the IPTC spec -- it will simply truncate those strings that are too long before writing them to a binary IPTC tag.
For this reason, we also are ending the practice of automatically translating several IPTC fields to and from what we figured were the equivalent generic metadata names. This was perhaps a dubious practice to begin with, but now the enforcement of length limits for IPTC (but not the generic metadata) makes it even more frought. There is probably nobody depending on this behavior (and maybe few OIIO users depending on IPTC support at all?), so now anybody purposely using IPTC metadata is fully responsible for setting it and dealing with any issues of whether it's "out of sync" with any other metadata that OIIO stores in or reads from a file.
Fixes #4342