수다닷컴

질문 제목 : 비트맵 픽셀에서 파란색 없애기왜 성공은 뜨고 안돼는걸까요 질문 내용 :

//this program will read a bmp image file
//and change the blue component of each pixel in that
//file to zeor value
//and produce the changed bitmap into a new file
//input:a bmp image file
//output: a new bmp file with blue componenet set to zero
#include stdio.h
#include malloc.h

int main()
{
char firstcharacter,secondcharacter;
int filesize;
int reserved;
int data_offset;
int size;
int width;
int height;
short planes;
short bit_count;
int compression;
int image_size;
int x_pixels_per_m;
int y_pixels_per_m;
int colors_used;
int colors_important;
//first read a bitmap file
file*fp = fopen(d:\\펭귄.bmp,rb); //file open
fread(&firstcharacter,sizeof(char),1,fp);
fread(&secondcharacter,sizeof(char),1,fp);
fread(&filesize,sizeof(int),1,fp);
fread(&reserved,sizeof(int),1,fp);
fread(&data_offset,sizeof(int),1,fp);
fread(&size,sizeof(int),1,fp);
fread(&width,sizeof(int),1,fp);
fread(&height,sizeof(int),1,fp);
fread(&planes,sizeof(short),1,fp);
fread(&bit_count,sizeof(short),1,fp);
fread(&compression,sizeof(int),1,fp);
fread(&image_size,sizeof(int),1,fp);
fread(&x_pixels_per_m,sizeof(int),1,fp);
fread(&y_pixels_per_m,sizeof(int),1,fp);
fread(&colors_used,sizeof(int),1,fp);
fread(&colors_important,sizeof(int),1,fp);
/*
printf(first character is %c \n, firstcharacter);
printf(second character is %c \n, secondcharacter);
printf(file size is %d byte \n, filesize);
printf(reserved is %d \n, reserved);
printf(data_offset is %d \n, data_offset);
printf(size is %d \n, size);
printf(width is %d \n, width);
printf(height is %d \n, height);
printf(planes is %d \n, planes);
printf(bit_count is %d \n, bit_count);
printf(compression is %d \n, compression);
printf(image_size is %d \n, image_size);
printf(x_pixels_per_m is %d \n, x_pixels_per_m);
printf(y_pixels_per_m is %d \n, y_pixels_per_m);
printf(colors_used is %d \n, colors_used);
printf(colors_important is %d \n, colors_important);
*/

//bmp header information completely read
//now read the pixel information
//first prepare memory for the pixel data
//with image_size
char * image_data = (char*)malloc(image_size);
fread(image_data,image_size,1,fp);
fclose(fp);
int i,j;
unsigned int padding;
padding = 4 - (3*width) % 4;

//change tje blue part of each pixel to zero
for(i=0 ; iheight ; i++)
for(j=0 ; jwidth ; j++)
{
image_data[i*(width*3+padding) + j*3] = 0;
}
file * wp;
wp = fopen(d:\\newfile.bmp,wb);
fwrite(&firstcharacter,sizeof(char),1,wp);
fwrite(&secondcharacter,sizeof(char),1,wp);
fwrite(&filesize,sizeof(int),1,wp);
fwrite(&reserved,sizeof(int),1,wp);
fwrite(&data_offset,sizeof(int),1,wp);
fwrite(&size,sizeof(int),1,fp);
fwrite(&width,sizeof(int),1,wp);
fwrite(&height,sizeof(int),1,wp);
fwrite(&planes,sizeof(short),1,wp);
fwrite(&bit_count,sizeof(short),1,wp);
fwrite(&compression,sizeof(int),1,wp);
fwrite(&image_size,sizeof(int),1,wp);
fwrite(&x_pixels_per_m,sizeof(int),1,wp);
fwrite(&y_pixels_per_m,sizeof(int),1,wp);
fwrite(&colors_used,sizeof(int),1,wp);
fwrite(&colors_important,sizeof(int),1,wp);
// write header information as same as you read
// now write the image pixel data which is changed one
fwrite(image_data,imageta,image_size,1,wp);

free(image_data);
fclose(wp);
}

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