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April 2006
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2006.04.04 22:14 "Re: BigTIFF Suggestion", by Larry Michaels
Our application acquires images from digital cameras and allows images to be stored in sequences which are currently TIFF files. It therefore commonly needs to append new images to existing TIFFs. Our users may need to save hundreds or even thousands of images in a single TIFF file. I have implemented a few tricks with the LibTIFF code to avoid having to walk through the entire directory list each time, but it would be great if the new BigTIFF specification could support this capability officially. I thought that simply adding another eight bytes to the BigTIFF header for an last IFD offset value would provide the needed information with minimum disruption to the specification. The value could be optional; If a BigTIFF writer did not want to write the offset value, it could simply write zero to the field. I realize that this suggestion would have been more appropriate two years ago, but I have only just recently been asked to enhance our application's efficient writing of huge image sequence files, and have therefore started investigating BigTIFF as an option. Larry Michaels