c语言读入图片
‘壹’ 请问如何使用纯c语言读取文件中的图片,并将图片存储在二维数组中
1、使用双层循环语句,就可以依次把数据顺序读入到一个二维数组当中了。2、例程:#include#include#defineMAXLINE3#defineMAXCOLUMN10voidmain(void){FILE*fp;//文件指针chararr[MAXLINE][MAXCOLUMN]={0};//定义3行10列的二维数组并初始化inti=-1;if((fp=fopen("./test/filename.txt","r"))==NULL){//打开txt文件perror("Fileopenerror!\n");return;}while((fgets(arr[++i],MAXCOLUMN+1,fp))!=NULL)//读取一行并存到arr数组printf("%d:",i);//打印行号//puts(arr[i]);char*subarr=strtok(arr[i],"");//以空格为分隔符从arr[i]中获得字串while(subarr!=NULL){data[i][j]=atoi(subarr);//将字串转为int型数据存入data数组printf("%d\t",data[i][j]);//打印data[i][jsubarr=strtok(NULL,"");//继续获得arr[i]中的字串j++;//data数组列加一}printf("\n");}//循环完毕后,所有数据已在data数组中printf("\n");fclose(fp);//关闭指针}
‘贰’ 如何用c语言读取图片
#include
using namespace std;
#define Twoto1(i,j,w) i*w+j
void createimage(unsigned char *&img, int w, int h)
{img = new unsigned char[w*h];}
void delateimage(unsigned char*img)
{delete []img;}
void readimage(unsigned char*img, int w, int h, char *fname)
{
FILE *fp;
fopen_s(&fp,fname, "rb");
if (fp == NULL){ cout << "error" << endl; return; }
size_t result;
result=fread(img , sizeof(unsigned char), w*h, fp);
if (result != w*h)
{
cout << "Reading error" << endl;
return;
}
else
cout << "Reading Ok!" << endl;
fclose(fp);
}
void mobanjuanji(unsigned char image, unsigned char*image1, int w, int h, float moban[5][5])
{
for (int i = 0; i for (int j = 0; j if (iw - 3 || j>h - 3)
image1[Twoto1(i,j,w)] = 0;
else
{
float temp = 0;
for (int m = 0; m<5; m++)
for (int n = 0; n<5; n++)
{
temp += (image[Twoto1(i-2+m,j-2+n,w)] moban[m][n]);
}
if (temp>255) image1[Twoto1(i, j, w)] = 255;
else if (temp<0) image1[Twoto1(i, j, w)] = 0;
else image1[Twoto1(i, j, w)] = temp;
}
}
void saveimage(unsigned char *img, int w, int h, char *fname)
{
FILE *fp;
fopen_s(&fp, fname, "wb");
if (fp == NULL) { cout << "error" << endl; return; }
size_t result;
result = fwrite(img, sizeof(unsigned char), w*h, fp);
if (result != w*h)
{
cout << "Write error" << endl;
return;
}
else
cout << "Write Ok!" << endl;
fclose(fp);
}
void main()
{
unsigned char *img;
unsigned char *img1;
float moban[5][5] = { {0,0,0,0,0},{0, -1, 0, 1, 0 }, { 0, -2, 0, 2, 0 }, { 0, -1, 0, 1, 0 }, { 0,0,0,0,0 } };
//float moban[5][5] = { 0 };
int w = 512, h = 512;
createimage(img, w, h);
createimage(img1, w, h);
readimage(img, w, h, "E:ss.raw");
mobanjuanji(img, img1,w, h, moban);
saveimage(img, w, h, "E:ss_1.raw");
saveimage(img1, w, h, "E:ss_2.raw");
delateimage(img);
delateimage(img1);
}

(2)c语言读入图片扩展阅读
C语言实现一个图片的读出和写入
#include <stdlib.h>
#include <windows.h>
int file_size(char* filename)//获取文件名为filename的文件大小。
{
FILE *fp = fopen(filename, "rb");//打开文件。
int size;
if(fp == NULL) // 打开文件失败
return -1;
fseek(fp, 0, SEEK_END);//定位文件指针到文件尾。
size=ftell(fp);//获取文件指针偏移量,即文件大小。
fclose(fp);//关闭文件。
return size;
}
int main ()
{
int size=0;
size=file_size("qw");
printf("%d ",size);
FILE * pFile,*qw;
char *buffer=(char*)malloc(sizeof(char)*size);
qw =fopen("qw","r");
pFile = fopen ( "qwe" , "wb" );
printf("%d==
",pFile);
printf("%d ",size);
fread(buffer,1,size,qw);
fwrite (buffer , sizeof(byte), size , pFile );
fclose (pFile);
rename("qwe","Groot.jpg");
return 0;
}
‘叁’ 如何使用C语言实现JPEG图像格式的读取与写入
1.图片也是属于文件类型的一种,图片属于二进制文件。使用fopen函数的二进制模式“rb”就可以打开。
2.例程:
#include<stdlib.h>
#include<stdio.h>
intmain()
{
FILE*fpPhoto,*fpText,*fpTarget;
intiRead;
charszBuf[100];
printf("请输入第一个文件名(bmp): ");
gets(szBuf);
fpPhoto=fopen(szBuf,"rb");
printf("请输入第二个文件名(txt): ");
gets(szBuf);
fpText=fopen(szBuf,"rb");
printf("请输入目的文件名(bmp): ");
gets(szBuf);
fpTarget=fopen(szBuf,"wb");
if(!fpPhoto||!fpText||!fpTarget)
{
printf("打开文件失败! ");
system("pause");
return-1;
}
while((iRead=fread(szBuf,1,sizeof(szBuf),fpPhoto))>0)
fwrite(szBuf,1,iRead,fpTarget);
while((iRead=fread(szBuf,1,sizeof(szBuf),fpText))>0)
fwrite(szBuf,1,iRead,fpTarget);
fclose(fpPhoto);
fclose(fpText);
fclose(fpTarget);
return0;
}
‘肆’ c语言,怎样读取一个BMP图片
#ifndef IMAGE_H
#define IMAGE_H
void image_info(FILE* file);
void image_save(FILE *file);
void image_gray();
void image_binarization();
void image_opposite();
void image_channel();   //抽取RGB通道
void image_bright();//改变图像亮度
typedef struct BMP
{
 //14字节
 unsigned short    bfType;            //文件标识 2字节 必须为BM 
    unsigned int      bfSize;                //文件大小 4字节 
    unsigned short    bfReserved1;        //保留,每字节以"00"填写 2字节 
    unsigned short    bfReserved2;        //同上 2字节 
    unsigned int      bfOffBits;            //记录图像数据区的起始位置(图象数据相对于文件头字节的偏移量)。 4字节
    //40字节
    unsigned int  biSize;                //表示本结构的大小 4字节 
    int    biWidth;                //位图的宽度  4字节 
    int    biHeight;               //位图的高度  4字节 
    unsigned short   biPlanes;            //永远为1 ,   2字节 
    unsigned short   biBitCount;        //位图的位数  分为1 4 8 16 24 32   2字节 
    unsigned int  biCompression;       //压缩说明   4字节 
    unsigned int  biSizeImage;            //表示位图数据区域的大小以字节为单位  4字节 
    int   biXPelsPerMeter;                //用象素/米表示的水平分辨率   4字节 
    int   biYPelsPerMeter;                //用象素/米表示的垂直分辨率   4字节 
    unsigned int  biClrUsed;            //位图使用的颜色索引数   4字节 
    unsigned int  biClrImportant;        //对图象显示有重要影响的颜色索引的数目  4字节  
 
} BMP;
int line_byte;
unsigned char *imagedata;
extern BMP bmp;
extern int line_byte;
extern unsigned char *imagedata;
#endif
//image_rw.c文件
#include<stdio.h>
#include<stdlib.h>
#include"image.h"
void image_info(FILE *file)
{
int times=3;             //输入文件名次数。
 char bmp_name[10];       //文件名
 printf("\nplease enter a file name for reading:");
 do 
 {
  if (times<3)
  {
   printf("\nplease enter a file name for reading again:");
  }
  fflush(stdin);
  gets(bmp_name);
  //printf("\n%s",bmp_name);
  file=fopen(bmp_name,"rb+");   //打开一个文件进行读写操作。
  --times;
  if (file==NULL)
  {
   printf("\nerror opening %s for reading! ",bmp_name);
  }
  else
  {
   break;
  }
 }
 while(times!=0);
 if (times==0)
 {
  printf("\nsorry, shutdown!");
  exit(1);
 }
//读取图像信息
    
    fseek(file,0L,0); //读取图像文件类型
    fread(&bmp,sizeof(BMP),1,file);
 printf("\n  bmp  tpye:    %u",bmp.bfType);
 printf("\n  bmp  size:    %u",bmp.bfSize);
 printf("\n  bmp  reserved1:    %u",bmp.bfReserved1);
 printf("\n  bmp  reserved2:    %u",bmp.bfReserved2);
 printf("\n  bmp  offBits:   %u",bmp.bfOffBits);
 printf("\n  bmp  bisize:   %u",bmp.biSize);
 printf("\n  bmp  biWidth:   %d",bmp.biWidth);
 printf("\n  bmp  biHeight:   %d",bmp.biHeight);
 printf("\n  bmp  biplans:   %u",bmp.biPlanes);
 printf("\n  bmp  biBitCount:   %u",bmp.biBitCount);
 printf("\n  bmp  biCompression:   %u",bmp.biCompression);
 printf("\n  bmp  biSizeImage:   %u",bmp.biSizeImage);
 printf("\n  bmp  biXPelsPerMeter:   %d",bmp.biXPelsPerMeter);
 printf("\n  bmp  biYPelsPerMeter:   %d",bmp.biYPelsPerMeter);
 printf("\n  bmp  biClrUsed:   %u",bmp.biClrUsed);
 printf("\n  bmp  biClrImportant:   %u\n",bmp.biClrImportant);
line_byte=(bmp.biWidth*bmp.biBitCount/8+3)/4*4; //获得图像数据每行的数据个数
 //printf("dfsa%u",bmp.line_byte);
   //bmp.imagedata=NULL;
 imagedata=(unsigned char*)malloc(bmp.biSizeImage);
 
 fseek(file,(long)bmp.bfOffBits,0);
 fread(imagedata,sizeof(unsigned char),bmp.biSizeImage,file);
 fclose(file);
}
//保存图像
void image_save(FILE *file)
{
 int times=3;             //输入文件名次数。
 char bmp_name[10];       //文件名
    //int i;          //记录数据区个数
 printf("\nplease enter a file name for writeing:");
 do 
 {
  if (times<3)
  {
   printf("\nplease enter a file name for writeing again:");
  }
  fflush(stdin);
  gets(bmp_name);
  printf("\n%s",bmp_name);
  file=fopen(bmp_name,"wb+");   //打开一个文件进行读写操作。
  --times;
  if (file==NULL)
  {
   printf("\nerror opening %s for writing",bmp_name);
  }
  else
  {
   break;
  }
 }
 while(times!=0);
 if (times==0)
 {
  printf("\nsorry, shutdown!");
  exit(1);
 }
//写文件头
    printf("\n%s",bmp_name);
    fseek(file,0L,0); //图像文件类型
    fwrite(&(bmp.bfType),sizeof(short),1,file);
 printf("\n  bmp  tpye:    %d",bmp.bfType);
    fseek(file,2L,0); //图像文件大小
    fwrite(&(bmp.bfSize),sizeof(int),1,file);
 printf("\n  bmp  size:    %d",bmp.bfSize);
    
 fseek(file,6L,0); //图像文件保留字1
    fwrite(&(bmp.bfReserved1),sizeof(short),1,file);
 printf("\n  bmp  reserved1:    %d",bmp.bfReserved1);
 fseek(file,8L,0); //图像文件保留字2
    fwrite(&(bmp.bfReserved2),sizeof(short),1,file);
 printf("\n  bmp  reserved2:    %d",bmp.bfReserved2);
 fseek(file,10L,0);//数据区的偏移量
    fwrite(&(bmp.bfOffBits),sizeof(short),1,file);
 printf("\n  bmp  offBits:   %d",bmp.bfOffBits);
fseek(file,14L,0);//文件头结构大小
    fwrite(&(bmp.biSize),sizeof(int),1,file);
 printf("\n  bmp  bisize:   %d",bmp.biSize);
fseek(file,18L,0);//图像的宽度
    fwrite(&(bmp.biWidth),sizeof(int),1,file);
 printf("\n  bmp  biWidth:   %d",bmp.biWidth);
 fseek(file,22L,0);//图像的高度
    fwrite(&(bmp.biHeight),sizeof(int),1,file);
 printf("\n  bmp  biHeight:   %d",bmp.biHeight);
fseek(file,24L,0);//图像的面数
    fwrite(&(bmp.biPlanes),sizeof(short),1,file);
 printf("\n  bmp  biplans:   %d",bmp.biPlanes);
 fseek(file,28L,0);//图像一个像素的字节数
    fwrite(&(bmp.biBitCount),sizeof(short),1,file);
 printf("\n  bmp  biBitCount:   %d",bmp.biBitCount);
 fseek(file,30L,0);//图像压缩信息
    fwrite(&(bmp.biCompression),sizeof(short),1,file);
 printf("\n  bmp  biCompression:   %d",bmp.biCompression);
 fseek(file,34L,0);//图像数据区的大小
    fwrite(&(bmp.biSizeImage),sizeof(int),1,file);
 printf("\n  bmp  biSizeImage:   %d",bmp.biSizeImage);
 fseek(file,38L,0);//水平分辨率
    fwrite(&(bmp.biXPelsPerMeter),sizeof(int),1,file);
 printf("\n  bmp  biXPelsPerMeter:   %d",bmp.biXPelsPerMeter);
 fseek(file,42L,0);//垂直分辨率
    fwrite(&(bmp.biYPelsPerMeter),sizeof(int),1,file);
 printf("\n  bmp  biYPelsPerMeter:   %d",bmp.biYPelsPerMeter);
 fseek(file,46L,0);//颜色索引数
    fwrite(&(bmp.biClrUsed),sizeof(int),1,file);
 printf("\n  bmp  biClrUsed:   %d",bmp.biClrUsed);
 fseek(file,50L,0);//重要颜色索引数
    fwrite(&(bmp.biClrImportant),sizeof(int),1,file);
    printf("\n  bmp  biClrImportant:   %d\n",bmp.biClrImportant);
fseek(file,(long)(bmp.bfOffBits),0);
 fwrite(imagedata,sizeof(unsigned char),bmp.biSizeImage,file);
 
 fclose(file);
}
//pixProcess.c文件
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include"image.h"
//灰度化
void image_gray()
{
 int i,j;
 unsigned char tmp;
 for (i=0;i<bmp.biHeight;i++)
 {
  for (j=0;j<line_byte/3;j++)
  {
   tmp=0.11*(*(imagedata+i*line_byte+j*3+0))+0.59*(*(imagedata+i*line_byte+j*3+1))+0.3*(*(imagedata+i*line_byte+j*3+2));   
      imagedata[i*line_byte+j*3+0]=tmp;
   imagedata[i*line_byte+j*3+1]=tmp;
   imagedata[i*line_byte+j*3+2]=tmp;
   //printf("\nnidsfh%d    %d",i,j);
  }
 }
}
//二值化
  
void image_binarization()
{
 int i,j;
 for (i=0;i<bmp.biHeight;i++)
 {
  for (j=0;j<line_byte;j++)
  {
   if ((*(imagedata+i*line_byte+j))<128)
   {
    imagedata[i*line_byte+j]=0;
   }
   else
   {
    imagedata[i*line_byte+j]=255;
   }
  }
 }
}
void image_opposite() //反相
{
 int i,j;
 for (i=0;i<bmp.biHeight;i++)
 {
  for (j=0;j<line_byte;j++)
  {
   imagedata[i*line_byte+j]=abs(255-imagedata[i*line_byte+j]);
  }
 }
}
void image_channel()   //抽取RGB通道
{
 int i,j;
 char rgb;
 printf("\nplease enter a char(r/g/b): ");
 fflush(stdin);
 scanf("%c",&rgb);
 if (rgb=='b')
 {
  for (i=0;i<bmp.biHeight;i++)
  {
      for (j=0;j<line_byte/3;j++)
   {
       imagedata[i*line_byte+3*j+1]=0;
    imagedata[i*line_byte+3*j+2]=0;
   }
  }
 }
 else if(rgb=='g')
 {
  for (i=0;i<bmp.biHeight;i++)
  {
      for (j=0;j<line_byte/3;j++)
   {
       imagedata[i*line_byte+3*j]=0;
    imagedata[i*line_byte+3*j+2]=0;
   }
  }
 }
 else
 {
  for (i=0;i<bmp.biHeight;i++)
  {
      for (j=0;j<line_byte/3;j++)
   {
       imagedata[i*line_byte+3*j]=0;
    imagedata[i*line_byte+3*j+1]=0;
   }
  }
 }
}
void image_bright()//改变图像亮度
{
 int level;
 int i,j;
 printf("\n please enter the level of brightness[-255 to 255] :");
 fflush(stdin);
 scanf("%d",&level);
 for (i=0;i<bmp.biHeight;i++)
 {
  for (j=0;j<line_byte;j++)
  {
   if (level>=0)
   {
    
    if ((imagedata[i*line_byte+j]+level)>255)
     imagedata[i*line_byte+j]=255;
    else
     imagedata[i*line_byte+j]+=level;
   }
   else
   {
    if ((imagedata[i*line_byte+j]-abs(level))<0)
     imagedata[i*line_byte+j]=0;
    else
     imagedata[i*line_byte+j]+=level;
   }
  }
 }
}
//void image_create()  //创建一幅24位BMP图像文件。
//{
//main.c文件
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<conio.h>
#include"image.h"
BMP bmp;
int main()
{ 
    FILE *file=NULL;
 int choose;
 char gono;
 do
 {
  image_info(file);  //imagedata已经分配了动态内存,但是没有释放
  printf("\n   1.image_opposite");
  printf("\n   2.image_gray");
  printf("\n   3.image_binarization");
        printf("\n   4.image_channel");
  printf("\n   5.image_brightness");
  //printf("6.image_opposite");
  //printf("7.image_opposite");
        printf("\nchoose your options:");
  fflush(stdin);
  scanf("%d",&choose);
  switch(choose)
  {
   
  case 1:
   image_opposite();
   image_save(file);
   free(imagedata);
   break;
  case 2:
   image_gray();
   image_save(file);
   free(imagedata);
   break;
  case 3:
   image_binarization();
   image_save(file);
   free(imagedata);
   break;
  case 4:
   image_channel();
   image_save(file);
   free(imagedata);
   break;
  case 5:
   image_bright();
   image_save(file);
   free(imagedata);
   break;
  default:
   printf("\n wrong choose!");
   
  }
  printf("\nlet's go on?(y/n):");
  fflush(stdin);
  scanf("%c",&gono);
  if (gono=='n')
  {
   printf("\nbye bye!");
   break;
  }
 }
 while(1);
  
 return 0;
}
‘伍’ C语言打开图像文件后读取像素
C语言打开图像文件后运用以下代码就可以读取像素,具体如下:
#ifndef IMAGE_H
#define IMAGE_H
void image_info(FILE* file);
void image_save(FILE *file);
void image_gray();
void image_binarization();
void image_opposite();
void image_channel();   //抽取RGB通道
void image_bright();//改变图像亮度
typedef struct BMP
{
 //14字节
 unsigned short    bfType;            //文件标识 2字节 必须为BM 
    unsigned int      bfSize;                //文件大小 4字节 
    unsigned short    bfReserved1;        //保留,每字节以"00"填写 2字节 
    unsigned short    bfReserved2;        //同上 2字节 
    unsigned int      bfOffBits;            //记录图像数据区的起始位置(图象数据相对于文件头字节的偏移量)。 4字节
    //40字节
    unsigned int  biSize;                //表示本结构的大小 4字节 
    int    biWidth;                //位图的宽度  4字节 
    int    biHeight;               //位图的高度  4字节 
    unsigned short   biPlanes;            //永远为1 ,   2字节 
    unsigned short   biBitCount;        //位图的位数  分为1 4 8 16 24 32   2字节 
    unsigned int  biCompression;       //压缩说明   4字节 
    unsigned int  biSizeImage;            //表示位图数据区域的大小以字节为单位  4字节 
    int   biXPelsPerMeter;                //用象素/米表示的水平分辨率   4字节 
    int   biYPelsPerMeter;                //用象素/米表示的垂直分辨率   4字节 
    unsigned int  biClrUsed;            //位图使用的颜色索引数   4字节 
    unsigned int  biClrImportant;        //对图象显示有重要影响的颜色索引的数目  4字节  
 
} BMP;
int line_byte;
unsigned char *imagedata;
extern BMP bmp;
extern int line_byte;
extern unsigned char *imagedata;
#endif
//image_rw.c文件
#include<stdio.h>
#include<stdlib.h>
#include"image.h"
void image_info(FILE *file)
{
int times=3;             //输入文件名次数。
 char bmp_name[10];       //文件名
 printf("\nplease enter a file name for reading:");
 do 
 {
  if (times<3)
  {
   printf("\nplease enter a file name for reading again:");
  }
  fflush(stdin);
  gets(bmp_name);
  //printf("\n%s",bmp_name);
  file=fopen(bmp_name,"rb+");   //打开一个文件进行读写操作。
  --times;
  if (file==NULL)
  {
   printf("\nerror opening %s for reading! ",bmp_name);
  }
  else
  {
   break;
  }
 }
 while(times!=0);
 if (times==0)
 {
  printf("\nsorry, shutdown!");
  exit(1);
 }
//读取图像信息
    
    fseek(file,0L,0); //读取图像文件类型
    fread(&bmp,sizeof(BMP),1,file);
 printf("\n  bmp  tpye:    %u",bmp.bfType);
 printf("\n  bmp  size:    %u",bmp.bfSize);
 printf("\n  bmp  reserved1:    %u",bmp.bfReserved1);
 printf("\n  bmp  reserved2:    %u",bmp.bfReserved2);
 printf("\n  bmp  offBits:   %u",bmp.bfOffBits);
 printf("\n  bmp  bisize:   %u",bmp.biSize);
 printf("\n  bmp  biWidth:   %d",bmp.biWidth);
 printf("\n  bmp  biHeight:   %d",bmp.biHeight);
 printf("\n  bmp  biplans:   %u",bmp.biPlanes);
 printf("\n  bmp  biBitCount:   %u",bmp.biBitCount);
 printf("\n  bmp  biCompression:   %u",bmp.biCompression);
 printf("\n  bmp  biSizeImage:   %u",bmp.biSizeImage);
 printf("\n  bmp  biXPelsPerMeter:   %d",bmp.biXPelsPerMeter);
 printf("\n  bmp  biYPelsPerMeter:   %d",bmp.biYPelsPerMeter);
 printf("\n  bmp  biClrUsed:   %u",bmp.biClrUsed);
 printf("\n  bmp  biClrImportant:   %u\n",bmp.biClrImportant);
line_byte=(bmp.biWidth*bmp.biBitCount/8+3)/4*4; //获得图像数据每行的数据个数
 //printf("dfsa%u",bmp.line_byte);
   //bmp.imagedata=NULL;
 imagedata=(unsigned char*)malloc(bmp.biSizeImage);
 
 fseek(file,(long)bmp.bfOffBits,0);
 fread(imagedata,sizeof(unsigned char),bmp.biSizeImage,file);
 fclose(file);
}
//保存图像
void image_save(FILE *file)
{
 int times=3;             //输入文件名次数。
 char bmp_name[10];       //文件名
    //int i;          //记录数据区个数
 printf("\nplease enter a file name for writeing:");
 do 
 {
  if (times<3)
  {
   printf("\nplease enter a file name for writeing again:");
  }
  fflush(stdin);
  gets(bmp_name);
  printf("\n%s",bmp_name);
  file=fopen(bmp_name,"wb+");   //打开一个文件进行读写操作。
  --times;
  if (file==NULL)
  {
   printf("\nerror opening %s for writing",bmp_name);
  }
  else
  {
   break;
  }
 }
 while(times!=0);
 if (times==0)
 {
  printf("\nsorry, shutdown!");
  exit(1);
 }
//写文件头
    printf("\n%s",bmp_name);
    fseek(file,0L,0); //图像文件类型
    fwrite(&(bmp.bfType),sizeof(short),1,file);
 printf("\n  bmp  tpye:    %d",bmp.bfType);
    fseek(file,2L,0); //图像文件大小
    fwrite(&(bmp.bfSize),sizeof(int),1,file);
 printf("\n  bmp  size:    %d",bmp.bfSize);
    
 fseek(file,6L,0); //图像文件保留字1
    fwrite(&(bmp.bfReserved1),sizeof(short),1,file);
 printf("\n  bmp  reserved1:    %d",bmp.bfReserved1);
 fseek(file,8L,0); //图像文件保留字2
    fwrite(&(bmp.bfReserved2),sizeof(short),1,file);
 printf("\n  bmp  reserved2:    %d",bmp.bfReserved2);
 fseek(file,10L,0);//数据区的偏移量
    fwrite(&(bmp.bfOffBits),sizeof(short),1,file);
 printf("\n  bmp  offBits:   %d",bmp.bfOffBits);
fseek(file,14L,0);//文件头结构大小
    fwrite(&(bmp.biSize),sizeof(int),1,file);
 printf("\n  bmp  bisize:   %d",bmp.biSize);
fseek(file,18L,0);//图像的宽度
    fwrite(&(bmp.biWidth),sizeof(int),1,file);
 printf("\n  bmp  biWidth:   %d",bmp.biWidth);
 fseek(file,22L,0);//图像的高度
    fwrite(&(bmp.biHeight),sizeof(int),1,file);
 printf("\n  bmp  biHeight:   %d",bmp.biHeight);
fseek(file,24L,0);//图像的面数
    fwrite(&(bmp.biPlanes),sizeof(short),1,file);
 printf("\n  bmp  biplans:   %d",bmp.biPlanes);
 fseek(file,28L,0);//图像一个像素的字节数
    fwrite(&(bmp.biBitCount),sizeof(short),1,file);
 printf("\n  bmp  biBitCount:   %d",bmp.biBitCount);
 fseek(file,30L,0);//图像压缩信息
    fwrite(&(bmp.biCompression),sizeof(short),1,file);
 printf("\n  bmp  biCompression:   %d",bmp.biCompression);
 fseek(file,34L,0);//图像数据区的大小
    fwrite(&(bmp.biSizeImage),sizeof(int),1,file);
 printf("\n  bmp  biSizeImage:   %d",bmp.biSizeImage);
 fseek(file,38L,0);//水平分辨率
    fwrite(&(bmp.biXPelsPerMeter),sizeof(int),1,file);
 printf("\n  bmp  biXPelsPerMeter:   %d",bmp.biXPelsPerMeter);
 fseek(file,42L,0);//垂直分辨率
    fwrite(&(bmp.biYPelsPerMeter),sizeof(int),1,file);
 printf("\n  bmp  biYPelsPerMeter:   %d",bmp.biYPelsPerMeter);
 fseek(file,46L,0);//颜色索引数
    fwrite(&(bmp.biClrUsed),sizeof(int),1,file);
 printf("\n  bmp  biClrUsed:   %d",bmp.biClrUsed);
 fseek(file,50L,0);//重要颜色索引数
    fwrite(&(bmp.biClrImportant),sizeof(int),1,file);
    printf("\n  bmp  biClrImportant:   %d\n",bmp.biClrImportant);
fseek(file,(long)(bmp.bfOffBits),0);
 fwrite(imagedata,sizeof(unsigned char),bmp.biSizeImage,file);
 
 fclose(file);
}
//pixProcess.c文件
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include"image.h"
//灰度化
void image_gray()
{
 int i,j;
 unsigned char tmp;
 for (i=0;i<bmp.biHeight;i++)
 {
  for (j=0;j<line_byte/3;j++)
  {
   tmp=0.11*(*(imagedata+i*line_byte+j*3+0))+0.59*(*(imagedata+i*line_byte+j*3+1))+0.3*(*(imagedata+i*line_byte+j*3+2));   
      imagedata[i*line_byte+j*3+0]=tmp;
   imagedata[i*line_byte+j*3+1]=tmp;
   imagedata[i*line_byte+j*3+2]=tmp;
   //printf("\nnidsfh%d    %d",i,j);
  }
 }
}
//二值化
  
void image_binarization()
{
 int i,j;
 for (i=0;i<bmp.biHeight;i++)
 {
  for (j=0;j<line_byte;j++)
  {
   if ((*(imagedata+i*line_byte+j))<128)
   {
    imagedata[i*line_byte+j]=0;
   }
   else
   {
    imagedata[i*line_byte+j]=255;
   }
  }
 }
}
void image_opposite() //反相
{
 int i,j;
 for (i=0;i<bmp.biHeight;i++)
 {
  for (j=0;j<line_byte;j++)
  {
   imagedata[i*line_byte+j]=abs(255-imagedata[i*line_byte+j]);
  }
 }
}
void image_channel()   //抽取RGB通道
{
 int i,j;
 char rgb;
 printf("\nplease enter a char(r/g/b): ");
 fflush(stdin);
 scanf("%c",&rgb);
 if (rgb=='b')
 {
  for (i=0;i<bmp.biHeight;i++)
  {
      for (j=0;j<line_byte/3;j++)
   {
       imagedata[i*line_byte+3*j+1]=0;
    imagedata[i*line_byte+3*j+2]=0;
   }
  }
 }
 else if(rgb=='g')
 {
  for (i=0;i<bmp.biHeight;i++)
  {
      for (j=0;j<line_byte/3;j++)
   {
       imagedata[i*line_byte+3*j]=0;
    imagedata[i*line_byte+3*j+2]=0;
   }
  }
 }
 else
 {
  for (i=0;i<bmp.biHeight;i++)
  {
      for (j=0;j<line_byte/3;j++)
   {
       imagedata[i*line_byte+3*j]=0;
    imagedata[i*line_byte+3*j+1]=0;
   }
  }
 }
}
void image_bright()//改变图像亮度
{
 int level;
 int i,j;
 printf("\n please enter the level of brightness[-255 to 255] :");
 fflush(stdin);
 scanf("%d",&level);
 for (i=0;i<bmp.biHeight;i++)
 {
  for (j=0;j<line_byte;j++)
  {
   if (level>=0)
   {
    
    if ((imagedata[i*line_byte+j]+level)>255)
     imagedata[i*line_byte+j]=255;
    else
     imagedata[i*line_byte+j]+=level;
   }
   else
   {
    if ((imagedata[i*line_byte+j]-abs(level))<0)
     imagedata[i*line_byte+j]=0;
    else
     imagedata[i*line_byte+j]+=level;
   }
  }
 }
}
//void image_create()  //创建一幅24位BMP图像文件。
//{
//main.c文件
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<conio.h>
#include"image.h"
BMP bmp;
int main()
{ 
    FILE *file=NULL;
 int choose;
 char gono;
 do
 {
  image_info(file);  //imagedata已经分配了动态内存,但是没有释放
  printf("\n   1.image_opposite");
  printf("\n   2.image_gray");
  printf("\n   3.image_binarization");
        printf("\n   4.image_channel");
  printf("\n   5.image_brightness");
  //printf("6.image_opposite");
  //printf("7.image_opposite");
        printf("\nchoose your options:");
  fflush(stdin);
  scanf("%d",&choose);
  switch(choose)
  {
   
  case 1:
   image_opposite();
   image_save(file);
   free(imagedata);
   break;
  case 2:
   image_gray();
   image_save(file);
   free(imagedata);
   break;
  case 3:
   image_binarization();
   image_save(file);
   free(imagedata);
   break;
  case 4:
   image_channel();
   image_save(file);
   free(imagedata);
   break;
  case 5:
   image_bright();
   image_save(file);
   free(imagedata);
   break;
  default:
   printf("\n wrong choose!");
   
  }
  printf("\nlet's go on?(y/n):");
  fflush(stdin);
  scanf("%c",&gono);
  if (gono=='n')
  {
   printf("\nbye bye!");
   break;
  }
 }
 while(1);
  
 return 0;
}
‘陆’ 用c语言如何读取和保存jpg图片文件
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
int file_size(char* filename)//获取文件名为filename的文件大小。
{
FILE *fp = fopen(filename, "rb");//打开文件。
int size;
if(fp == NULL) // 打开文件失败
return -1;
fseek(fp, 0, SEEK_END);//定位文件指针到文件尾。
size=ftell(fp);//获取文件指针偏移量,即文件大小。
fclose(fp);//关闭文件。
return size;
}
int main ()
{
int size=0;
size=file_size("qw");
printf("%d ",size);
FILE * pFile,*qw;
char *buffer=(char*)malloc(sizeof(char)*size);
qw =fopen("qw","r");
pFile = fopen ( "qwe" , "wb" );
printf("%d== ",pFile);
printf("%d ",size);
fread(buffer,1,size,qw);
fwrite (buffer , sizeof(byte), size , pFile );
fclose (pFile);
rename("qwe","Groot.jpg");
return 0;
}

(6)c语言读入图片扩展阅读:
c语言读取TXT文件:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_LINE 1024
int main()
{
char buf[MAX_LINE]; /*缓冲区*/
FILE *fp; /*文件指针*/
int len; /*行字符个数*/
if((fp = fopen("test.txt","r")) == NULL)
{
perror("fail to read");
exit (1) ;
}
while(fgets(buf,MAX_LINE,fp) != NULL)
{
len = strlen(buf);
buf[len-1] = '
