用简单的opengl图像库（SOIL）加载图像（颜色空间：灰色）

Question

I want to read out the pixel values of an grey scale image. With RGB images I have no problems. The code is just simply:

int width, height;
unsigned char* image = SOIL_load_image(filepath.c_str(), &width, &height, 0, SOIL_LOAD_RGB);
std::cout << "size of image : " << size  << " width: " << width << " height: " << height << std::endl;

Now I want to load an image(png) with color space GRAY, I thought I could simply change SOIL_LOAD_RGB to SOIL_LOAD_L but that don't work out.

My output on the console is: size of image : -237407992 width: 10 height: -1312230988

And it is not constant. Only the width stays 10, and the height is changing every time I run the program.

Is there something I have to change or consider when working with gray scale images?

Answer 1

您应该将第三个参数从“0”更改为“＆channel”，如下所示

unsigned char *image = SOIL_load_image(filepath.c_str(), &width, &height, &channel, SOIL_LOAD_L);