Re: [Boost-users] GIL, tiff, image resolution, boost-1.47.0

Subject: Re: [Boost-users] GIL, tiff, image resolution, boost-1.47.0
From: david x callaway (dxc_at_[hidden])
Date: 2011-09-20 20:23:43

ok, I confess:  I couldn't figure out how to ask it for resolution, nor how to write it.  I can see tags that have to do with resolution and resolution unit, but that's all I understood.

thx
dxc

On Sep 19, 2011, at 9:53 AM, Christian Henning wrote:

> Hi David, I would recommend to use the new io extension. You can find it here:
> 
> http://code.google.com/p/gil-contributions/downloads/detail?name=boost_review.zip&can=2&q=#makechanges
> 
> Let me know if the io_new solves your problems.
> 
> Christian
> 
> On Sat, Sep 17, 2011 at 6:32 AM, david x callaway <dxc_at_[hidden]> wrote:
>> boost 1.47.0, os/x 10.6.8, gcc-4.2.1 apple build, 64bit
>> 
>> I can read a tiff, get its raw buffer, fool around with it and write it back out as tiff, no problem, but is it possible to get/write the resolution?  I understand that the res doesn't matter to the pixel content, but it *does* matter to some image processing chains.  I know tiff tags support it, separately for x and y, and with different units, e.g. dpi, so I know I *could* descend to libtiff and do it there, but for me that would defeat the purpose of using GIL in the first place.
>> 
>> thx
>> dxc
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