#include
#include
#include
#include
#include "jpeglib.h"
#define DEBUG_RGB_OUT (1)
#define FILE_NAME "./test.jpg"
#define RGB_FILE "./test.rgb"
static unsigned char* jpeg_dec(char*filename,int*width,int*height)
{
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerrr;
JSAMPARRAY buffer;
int row_width;
unsigned char *tmp = NULL;
unsigned char *rgb_buffer;
uint32_t i = 0;
int ret = -1;
FILE * infile = fopen(filename, "rb");
if(!infile)
{
printf("not jpg file%s\r\n",filename);
return NULL;
}
#ifdef DEBUG_RGB_OUT
FILE * outfile = fopen(RGB_FILE, "wb");
if(!outfile)
{
printf("not RGB_FILE jpg file%s\r\n",RGB_FILE);
return NULL;
}
#endif
cinfo.scale_num = cinfo.scale_denom = 1/2 ;
cinfo.err = jpeg_std_error(&jerrr);
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo,infile);
jpeg_read_header(&cinfo,TRUE);
jpeg_start_decompress(&cinfo);
*width = cinfo.output_width;
*height = cinfo.output_height;
row_width = cinfo.output_width * cinfo.output_components;
buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, row_width, 1);
rgb_buffer = (unsigned char *)malloc(row_width * cinfo.output_height);
memset(rgb_buffer, 0, row_width * cinfo.output_height);
tmp = rgb_buffer;
while(cinfo.output_scanline < cinfo.output_height)
{
ret = jpeg_read_scanlines(&cinfo,buffer,1);
memcpy(tmp,*buffer,row_width);
#ifdef DEBUG_RGB_OUT
fwrite(tmp,row_width,1,outfile);
#endif
tmp += row_width;
i +=row_width;
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose(infile);
#ifdef DEBUG_RGB_OUT
fclose(outfile);
#endif
return rgb_buffer;
}
int main()
{
int width;
int height;
jpeg_dec(FILE_NAME,&width,&height);
return 0;
}
![linux c编程之libjpeg的使用和rgb图片格式查看_第1张图片](http://img.e-com-net.com/image/info8/624dd900720e48bfa34132891958a3a4.jpg)
gcc jpeg.c -o jpeg -ljpeg -I jpeg-6b/
./jpeg
ls -l test.rgb
工具使用:
分辨率选择: 1920x1080
像素格式选择: RGB24
工具分享:
链接:https:
提取码:9swr
![linux c编程之libjpeg的使用和rgb图片格式查看_第2张图片](http://img.e-com-net.com/image/info8/2f9dd03b26ed446fa25c32a4c34529d2.jpg)
![在这里插入图片描述](http://img.e-com-net.com/image/info8/17f0e8128df94b24871b6f5a5310c04f.jpg)