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August 2005
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2005.08.08 11:43 "Re: Overlay Hyperlinks On TIFF", by Joris Van Damme
Rob, Forgot to answer this one: > Drawback: manipulating the image could corrupt the integrity and > validity of the area params if they are preserved at all. > (integrity tag needed) The integrity tag is an invention of your own, not an invention included in the TIFF file format. The same integrity problem also presents itself for a number of other data's, like pagenumber, thumbnails, and whatnot. I imagine that if GeoTIFF includes data on the size of the area covered, the cropping the image corrupts that data too. Etc, etc. It's not a problem, actually, as the correct copy/edit/manipulate procedure is to only preserve the tags the code knows that can be preserved. One should not ever do a 'blind tag copy'. Joris Van Damme info@awaresystems.be http://www.awaresystems.be/ Download your free TIFF tag viewer for windows here: http://www.awaresystems.be/imaging/tiff/astifftagviewer.html