c++ - What is the default TIFF orientation? -

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i'm working tiff data , i've come upon few test images not have orientation data. appeared me upside down defaulted orientation orientation_topleft seems working.

i'm curious though, accepted default orientation? noticed software ignores orientation data anyway. can give me advice?

this documentation says "default 1". in same page, explains 1 = top left.

so seem whatever software using read file later non-conformant.


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