目前一般主流的图像格式也就是bmp，jpg，png，tga，dds，除了DDS一般是给DX用的，虽然一堆OpenGL程序也有用的，但是我一般只用png和tga，
png不用说了，带alpha通道，tga就是4通道信息，如果你想3通道存颜色，4通道不存透明而是别的什么信息，又有编辑器如Photoshop支持的，tga就用得着，而png虽然
也能存alpha，但是编辑器不支持Alpha单独编辑那种诡异玩法就不行了。然尔一般也就png。所以来吃狗！！！
简单的写个，读写png的例子，精简自自带例子，(0,0)是左上角像素
#include#define STB_IMAGE_WRITE_IMPLEMENTATION#include "stb_image_write.h"#define STB_IMAGE_IMPLEMENTATION#include "stb_image.h"int main(int argc, char** argv){ int w, h, n; //rgba //load image unsigned char *data = stbi_load("rgba.png", &w, &h, &n, 0); printf("%d, %d, %d\n", w, h, n); //change pixel //rgba,write 10 red pixel at line 11 for (int dx = 0; dx < 10; ++dx) { data[n * w * 10 + dx * n + 0] = 255; data[n * w * 10 + dx * n + 1] = 0; data[n * w * 10 + dx * n + 2] = 0; data[n * w * 10 + dx * n + 3] = 255; } //write image stbi_write_png("write.png", w, h, n, data, w * 4); stbi_image_free(data); return 0;}
#include#include #include const unsigned char * loadfile(const std::string &file, int &size){ std::ifstream fs(file.c_str(), std::ios::binary); fs.seekg(0, std::ios::end); size = fs.tellg(); char * data = new char[size + 1]; fs.seekg(0); fs.read(data, size); fs.close(); data[size] = 0; return (unsigned char *)data;}int main(){ int w; int h; int channels; int size; const unsigned char * data = loadfile("D:/1.jpg", size); const unsigned char * logo = stbi_load_from_memory(data, size, &w, &h, &channels, 0); for (int i = 0; i < 3; ++i) { std::cout << (int)logo[i] << std::endl; }}