Christian

On Wed, Sep 21, 2011 at 3:56 AM, Olivier Tournaire <olitour@gmail.com> wrote:

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@pobox.com>
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@pobox.com> 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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