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

Subject: Re: [Boost-users] GIL, tiff, image resolution, boost-1.47.0
From: Olivier Tournaire (olitour_at_[hidden])
Date: 2011-09-21 03:56:23

Hi,

struct tiff_x_resolution : tiff_property_base< float, TIFFTAG_XRESOLUTION >
{};
and
struct tiff_y_resolution : tiff_property_base< float, TIFFTAG_YRESOLUTION >
{};

are defined in
http://code.google.com/p/gil-contributions/source/browse/trunk/gil_2/boost/gil/extension/io_new/tiff_tags.hpp?r=628.
However,

 template< typename Log >
 struct image_write_info< tiff_tag, Log >

the struct you have to give when you write an image / a view does not seem
to support these tags. Christian, could you add them?

Regards,

Olivier

2011/9/21 david x callaway <dxc_at_[hidden]>

> 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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