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July 2006
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2006.07.20 13:55 "newbiequestion: [?] backup complete ifd > private ifd", by Karin Hoehne
Hi there, everybody. I guess this is somewhat of a newbiequestion ... for a course at the university i do have following assignment: for data-preservation-reasons [> improve relevant file qualities i.e. for digital libraries] : copy the header [? is this possible ?] and the IFD of an existing tiff-file and insert this 'copy' as a new ifd inside the file. in other words: 2 chunks of data are changed parallel and synchronized by a piece of software. if these two chunks are >not< identical, do something like a warning, that there might be something wrong with the file. [i.e. display-qualities, filesize, whatever] this is my prblem so far ... -------------------------------------------------- after doing pretty much homework by reading the archive of >this< list, several techspecs and playing around with the libtiff, i pretty much figured out some basic questions and now i am hoping you could perhabs give me a hint, if i am [basically] on the right track: [?] Is there a way to copy/backup an entire ifd and create a new, pivate one at the end after the last ifd? Well, I guess not, but one can hope ... :) [?] Is there a way [which i couldn't figure out till now] to print a list of all tags - including private tags? [i mean in this way: is there something or not, indicated by an integer like 0 and 1] or [>some< kind of information of a private tag.] [?] According to this: http://www.asmail.be/msg0054967690.html : As far as I don't know the datatype of possible private tags, do i have do restrict the task on the 45 baselinetags? [?] Is there some elegant, automated implementation in the libtiff to copy all of the baselinetags or do i have to write a readingfunction for every single tag? -------------------------------------------------- Well, as mentioned before, i don't hope for anything like real code but something like a hint to solve the problem. :) / thx in advance /karin