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

Hi Christian, 2010/6/2 Christian Henning

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 wrote:

...

Hi all,

I am currently trying to write a compressed jpeg image without any success. Here is my code:

#include <string>

#include

#include #include #include #include #include

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 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

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