使用stbi_write_png，如何将0和1的矩形字节数组转换为单色png文件？

Question

[stb image library，如何使用调用stbi_image_write函数将矩形元素的矩形数组（每个元素的值为0或1）转换为单色png图像（其中1表示彩色像素）？这是我们到目前为止的代码：

using namespace std;

#define STB_IMAGE_IMPLEMENTATION
#include "stb/stb_image.h"
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb/stb_image_write.h"

/* ... */

const uint32_t BITMAP_SIZE = height * width;
uint8_t* bitmap = new uint8_t[BITMAP_SIZE];
for (int i = 0; i < BITMAP_SIZE; i++) // clear the bitmap
    bitmap[0] = 0;
/* write 1s to some elements of bitmap */

constexpr int CHANNELS = 4; // indexed (really 1 or 0)
string filename = "my_image.png";
stbi_write_png(/* what parameters should be passed here? */); 
delete [] bitmap;

将参数传递给stbi_write_png以获得上述所需输出的正确方法是什么？

Answer 1

您需要CHANNELS = 1（因为每个像素1个字节）。