我的程序存在问题。我一直试图谷歌的问题,但似乎无法找到我可以使用的东西。我对C很陌生,所以想尽一切办法学习。将图像转换为黑色和白色的问题C
当我尝试用./imgconvert.c
我碰到下面的错误运行:
./imgconvert.c: line 6: struct: command not found
./imgconvert.c: line 7: uint8_t: command not found
./imgconvert.c: line 8: syntax error near unexpected token `}'
./imgconvert.c: line 8: `};'
我试图编译程序的财产以后像myProgram.o
有: gcc -c imgconvert.c -o myProgram.o
然后./myProgram
。但我得到一个权限错误,如果我修复使用chmod然后我得到这个错误:
bash: ./myProgram.o: cannot execute binary file
我不知道该怎么办?
代码:
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct pixel {
uint8_t r, g, b, a;
};
static uint8_t *load_image(char *filename, int *sizex, int *sizey)
{
uint8_t *image;
char buf[512];
char *bufptr;
int ret;
FILE *fp = fopen(filename, "r");
bufptr = fgets(buf, 512, fp);
ret = fscanf(fp, "%d %d\n", sizex, sizey);
bufptr = fgets(buf, 512, fp);
image = malloc(*sizex * *sizey * 4);
int i;
uint8_t *ptr = image;
for (i=0; i<*sizex * *sizey; ++i) {
ret = fread(ptr, 1, 3, fp);
ptr += 4;
}
fclose(fp);
return image;
}
static int save_image(const char *filename, uint8_t *image, int sizex, int sizey)
{
FILE *fp = fopen(filename, "w");
fprintf(fp, "P6\n%d %d\n255\n", sizex, sizey);
int i;
uint8_t *ptr = image;
for (i=0; i<sizex * sizey; ++i) {
fwrite(ptr, 1, 3, fp);
ptr += 4;
}
fclose(fp);
return 1;
}
void convert_grayscale(uint8_t *input, uint8_t *output, int sizex, int sizey)
{
// Y = 0.299 * R + 0.587 * G + 0.114 * B
int i;
for (i = 0; i < sizex * sizey; ++i)
{
struct pixel *pin = (struct pixel*) &input[i*4];
struct pixel *pout = (struct pixel*) &output[i*4];
float luma = 0.299 * pin->r + 0.587 * pin->g + 0.114 * pin->b;
if (luma > 255)
luma = 255;
uint8_t intluma = (int) luma;
pout->r = intluma;
pout->g = intluma;
pout->b = intluma;
pout->a = 255;
}
}
int main()
{
uint8_t *inputimg, *outputimg;
int sizex, sizey;
inputimg = load_image("image.ppm", &sizex, &sizey);
outputimg = malloc(sizex * sizey * 4);
convert_grayscale(inputimg, outputimg, sizex, sizey);
save_image("output.ppm", outputimg, sizex, sizey);
}
灰度!=黑色和白色。如果你想B&W你想要一个二值化过滤器,它有一个中间值,所有> n变成1,所有变量都变为0。 – Matt
将来,请将您的代码内嵌在问题中;请勿链接到外部网站。我们希望这个问题从现在起仍然有意义,“pastebin”类型网站经常会在一段时间后删除。 – zwol