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2006.04.04 23:07 "Re: BigTIFF Suggestion", by Larry Michaels
Joris, I appreciate your help. When I referred to a CRC, I meant that I save a CRC of the four-byte offset only. It may be overkill, but it, along with my little signature, allows me to be quite certain that what I read at the end of the file is what I wrote there and nothing else. That way, there is very little danger of seeking to the wrong offset for appending if I read a file written by a different app or one which was truncated. I do not want to put the information in a separate file because users may move and rename their files. We have a number of requirements for image sequence file, some of which conflict with each other. The two biggest are the ability to hold very large numbers of very large images, and to be able to be written quickly. Our application does not yet support files larger than 4GB, but I have been told to add the support, so I have been comparing various options, one of which might be BigTIFF. I think that PDF is probably too complicated for our purposes. I may implement a proprietary format optimized for our needs and also allow users to save their files as BigTIFF for compatibility with other applications. Larry Michaels
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