GIL, tiff, image resolution, boost-1.47.0
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
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_revie... 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 _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
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_revie...
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 _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
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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 <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_revie...
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 _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
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Hi there, I'll try to add that this weekend. Seems I need to branch out now since I have some other changes that are not release ready. I bet it's easy with subversion just have never quite done. I'll get back here once I'm done. 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/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 <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_revie...
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 _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
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David, I have added the code change you requested. Could you get the latest from the trunk? http://gil-contributions.googlecode.com/svn/trunk/ Regards, 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/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 <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_revie...
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 _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
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participants (3)
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Christian Henning -
david x callaway -
Olivier Tournaire