Hi,

The source code is:

#include <stdio.h>
#include <jpeglib.h>
#include <stdlib.h>


unsigned char *raw_image = NULL;

int width = 2000;
int height = 1300;
int bytes_per_pixel = 3;
int color_space = JCS_RGB;



int read_jpeg_file( char *filename )
{

struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;



JSAMPROW row_pointer[1];

FILE *infile = fopen( filename, "rb" );
unsigned long location = 0;
int i = 0;

if ( !infile )
{
printf("Error opening jpeg file %s\n!", filename );
return -1;
}

cinfo.err = jpeg_std_error( &jerr );

jpeg_create_decompress( &cinfo );

jpeg_stdio_src( &cinfo, infile );

jpeg_read_header( &cinfo, TRUE );


printf( "JPEG File Information: \n" );
printf( "Image width and height: %d pixels and %d pixels.\n", cinfo.image_width, cinfo.image_height );
printf( "Color components per pixel: %d.\n", cinfo.num_components );
printf( "Color space: %d.\n", cinfo.jpeg_color_space );


jpeg_start_decompress( &cinfo );


raw_image = (unsigned char*)malloc( cinfo.output_width*cinfo.output_height*cinfo.num_components );

row_pointer[0] = (unsigned char *)malloc( cinfo.output_width*cinfo.num_components );

while( cinfo.output_scanline < cinfo.image_height )
{
jpeg_read_scanlines( &cinfo, row_pointer, 1 );
for( i=0; i<cinfo.image_width*cinfo.num_components;i++)
raw_image[location++] = row_pointer[0][i];
}

jpeg_finish_decompress( &cinfo );
jpeg_destroy_decompress( &cinfo );
free( row_pointer[0] );
fclose( infile );

return 1;
}


int write_jpeg_file( char *filename )
{
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;


JSAMPROW row_pointer[1];
FILE *outfile = fopen( filename, "wb" );

if ( !outfile )
{
printf("Error opening output jpeg file %s\n!", filename );
return -1;
}
cinfo.err = jpeg_std_error( &jerr );
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo, outfile);


cinfo.image_width = width;
cinfo.image_height = height;
cinfo.input_components = bytes_per_pixel;
cinfo.in_color_space = color_space;

jpeg_set_defaults( &cinfo );

jpeg_start_compress( &cinfo, TRUE );

while( cinfo.next_scanline < cinfo.image_height )
{
row_pointer[0] = &raw_image[ cinfo.next_scanline * cinfo.image_width * cinfo.input_components];
jpeg_write_scanlines( &cinfo, row_pointer, 1 );
}

jpeg_finish_compress( &cinfo );
jpeg_destroy_compress( &cinfo );
fclose( outfile );

return 1;
}

int main()
{
char *infilename = "rro1.bmp", *outfilename = "rr.jpg";



if( read_jpeg_file( infilename ) > 0 )
{

if( write_jpeg_file( outfilename ) < 0 ) return -1;
}
else return -1;



return 0;
}



This code is working without any error message. but Displayed image is not decompressed .. Image is not a clear picture after decompressed ..
i need to display a decompressed JPEG image at the out put..

Please help me out with this problem,,,any answer will appreciated ..