On 11-01-10 1:00 PM, David Vincent-Jones wrote:
It looks as if we have lost EXIF data from PNG exports at this time. The
data was being written through some past updates but now it only appears
that a small amount of XMP data is being written.
It has been suggested to me that PNG format, with its rather poor
compressibility, may not be the best storage format considering today’s
ever increasing image sizes. My past experience with the many flavours
of TIFF has created a personal aversion to that form. Your comments
would be appreciated and I would be interested to know whether there are
intentions to incorporate other formats at some date.
PNG vs TIFF compression-wise doesn't have much differences.
As for Exif, PNG does not support it (officially) so I don't recommend
it. However, XMP is supported, and you can store most of Exif into XMP.
That's the route I'd recommend to take, and that's what Lightroom (for
example) does in the XMP sidecar it creates for RAW files.
(Not precluding what rawstudio does or does not at that point)
I don't consider TIFF being a problematic format anymore. TIFF today is
pretty much consistent. On Linux, everybody use libtiff, and most of the
other vendor outside have a good implementation when they don't use libtiff.
Hub
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