2004.10.01 14:17 "Re: [Tiff] quad-tile", by Joris Van Damme

The libtiffpic suite (thats where you got this, right?)

This particular file comes from a compressed file named 'pics-3.6.1.tar.gz', that in turn comes from some LibTiff place (don't recall where exactly, but somewhere on your pages for sure). I seem to remember the was a similar testsuite in the 3.5.7 days, that also contained variants of this same image, though I never bothered to look at the tagsets more closely at that time. So probably its been around for quite a while. So if 'libtiffpic suite' is anything new, than you're referring to a source I know nothing about and this image did not come from.

includes a variety of "problem" TIFF files that are non-standard as well as various standards compliant files. While I don't recall all the history, I assume they exist so we have samples of the weird variants to help us maintain various hacks required to make them work.

I understand.

So, I think the better solution might be to segregate our suite of test images into files considered to be standard and valid, and those that are invalid but that we want to work with anyways for purposes of interoperability.

Yes, absolutely defenetly.

I have been leaving the sample image management up to Andrey though, so perhaps he will have further thoughts. I do believe he is planning to augment the set of test images as he works on a libtiff test suite.

Ah, I was toying with the same idea. Seeing I can contribute so little C (let alone makefiles ;-)), perhaps this way I can ease Andrey's workload? If not, perhaps I can at least contribute a suggestion: a HTML index into the testimage, explaining what is what, and what is valid, and including tag dumps (and maybe even a reference thumbnail in a HTML-friendly and independent format like PNG) could increase the usefullness of a testimage suite tremendously.

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