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December 2004
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2004.12.07 17:16 "Re: Having problems adding IPTC to a TIFF", by Bob Friesenhahn
On Tue, 7 Dec 2004, Eric VERGNAUD wrote: > > 1. Tolerating bugs, for the sake of backward compatibility with bug compensating > > software, only leads to validating the bug. Photoshop did that, according to > > Chris, to compensate for the GraphicsMagic bug. Bob, building from GraphicsMagic > > rather then reading a spec, next tried to validate the GraphicsMagic behaviour > > earlier saying that Photoshop did it too. Other software, building on LibTiff, > > will do it too... Photoshop 3.0 (around the time the abberant behavior is documented to first be introduced) far pre-dates GraphicsMagick. Photoshop did it to be compatable with some other existing software. I don't think that Adobe cares much about GraphicsMagick. ImageMagick/GraphicsMagick behave like Photoshop since Photoshop is the industry's de-facto standard. > > 4. There's some value in truth. Correcting a mistake is a good thing, even if > > it does come at some cost. This mistake has existed since maybe 1992. Mistakes which have existed for a very long time are difficult to correct later. > Well maybe the first thing to do would be to see what Photoshop IS doing. > Since Adobe is in charge of the TIFF specs, if they're writing IPTC as a > LONG array, then THAT IS the spec, even if it's conceptually incorrect. If > they're writing UNDEFINED of whatever, then libtiff should definitely > follow. Adobe did not invent IPTC in TIFF. However, as was previously mentioned, Photoshop is writing IPTC as a LONG array, although it will accept both forms. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us http://www.simplesystems.org/users/bfriesen