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

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/g.... 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

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:

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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

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Let me know if the io_new solves your problems.

Christian

On Sat, Sep 17, 2011 at 6:32 AM, david x callaway wrote:

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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.

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thx dxc _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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