Re: [Boost-users] [gil io_new] Problem writing a compressed jpeg

Subject: Re: [Boost-users] [gil io_new] Problem writing a compressed jpeg
From: Olivier Tournaire (olitour_at_[hidden])
Date: 2010-06-02 11:03:17

Hi Christian,

2010/6/2 Christian Henning <chhenning_at_[hidden]>

> Hi Olivier, your code looks good and runs on my machine without any
> problems. Could you please describe what your problem is? Please make
> sure you have the latest of gil and gil::io_new
>

The code works. However, the output image is not compressed. It has the same
size (in octets) as the  one which uses the default jpeg_tag.

>
> BTW, you can pass strings into the io_new interface. No need for
> c_str(). Also the jpeg_dct_method::fastest parameter works just fine.
>

Could yo please also tell me more about this parameter?

Regards,

Olivier

>
> Regards,
> Christian
>
> On Tue, Jun 1, 2010 at 8:57 PM, Olivier Tournaire <olitour_at_[hidden]>
> wrote:
> > Hi all,
> >
> > I am currently trying to write a compressed jpeg image without any
> success.
> > Here is my code:
> >
> > #include <string>
> >
> > #include <boost/mpl/vector.hpp>
> >
> > #include <boost/gil/gil_all.hpp>
> > #include <boost/gil/extension/io_new/tiff_read.hpp>
> > #include <boost/gil/extension/io_new/tiff_write.hpp>
> > #include <boost/gil/extension/io_new/jpeg_read.hpp>
> > #include <boost/gil/extension/io_new/jpeg_write.hpp>
> >
> > using namespace std;
> > using namespace boost;
> > using namespace gil;
> >
> > int main(int argc, char** argv)
> > {
> >     string base_image_path(argv[1]);
> >     string output_image_path(argv[2]);
> >     string output_compressed_image_path(argv[3]);
> >
> >     typedef mpl::vector<
> >             rgb8_image_t,
> >             rgb16_image_t
> >     > rgb_image_types;
> >     typedef any_image<rgb_image_types> any_image_type;
> >     typedef any_image_type::view_t any_view_type;
> >
> >     // Read tiff image
> >     image_read_info< tiff_tag > info = read_image_info( base_image_path
> >                                                    , tiff_tag() );
> >
> >     any_image_type input_image;
> >     read_image(base_image_path.c_str(), input_image, tiff_tag());
> >
> >     write_view(output_image_path.c_str(), view(input_image), jpeg_tag());
> >
> >     image_write_info< jpeg_tag > compressed_jpeg_info;
> >     compressed_jpeg_info._quality = 30;
> >     //compressed_jpeg_info._dct_method = jpeg_dct_method::fastest;
> >     write_view(output_compressed_image_path.c_str(), view(input_image),
> > compressed_jpeg_info);
> > }
> >
> > Could you please help me ?
> >
> > Regards,
> >
> > Olivier
> >
> > _______________________________________________
> > Boost-users mailing list
> > Boost-users_at_[hidden]
> > http://lists.boost.org/mailman/listinfo.cgi/boost-users
> >
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