常用圖像格式（PNG,JPG)到SGI圖像格式（RGB,BW)的轉換

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根據該網站的描述和給的相應例子，自己改寫了一個把png，jpg等常用格式的圖片轉化為rgb,bw格式的代碼。

#include<stdio.h>
#include<stdlib.h> 
#include<string.h>
\\待轉換的圖像長寬
#define IXSIZE      (512)
#define IYSIZE      (512)
#include<opencv.hpp>
using namespace cv;void putbyte(FILE *outf, unsigned char val)
{unsigned char buf[1];buf[0] = val;fwrite(buf, 1, 1, outf);
}void putshort(FILE *outf, unsigned short val)
{unsigned char buf[2];buf[0] = (val >> 8);buf[1] = (val >> 0);fwrite(buf, 2, 1, outf);
}static int putlong(FILE *outf, unsigned long val)
{unsigned char buf[4];buf[0] = (val >> 24);buf[1] = (val >> 16);buf[2] = (val >> 8);buf[3] = (val >> 0);return fwrite(buf, 4, 1, outf);
}int main()
{printf("%d\n", sizeof(unsigned));Mat img, img1;Mat dst;img = imread("./scene_dense_mesh_refine_texture1.jpg");img1 = imread("./test.jpg");printf("%d\n", img.rows);printf("%d\n", img.cols);resize(img, dst, Size(256, 256), (0, 0), (0, 0), INTER_LINEAR);imwrite("./test2.png", dst);//imwrite("./test.jpg", dst);printf("%u %u %u\n", img.at<Vec3b>(255, 0)[2], img.at<Vec3b>(255, 0)[1], img.at<Vec3b>(255, 0)[0]);printf("%u %u %u\n", img.at<Vec3b>(0, 255)[2], img.at<Vec3b>(0, 255)[1], img.at<Vec3b>(0, 255)[0]);imshow("img", img);waitKey(0);FILE *of;char iname[80];unsigned char outbuf[IXSIZE];int i, x, y;of = fopen("example.rgb", "w");if (!of) {fprintf(stderr, "sgiimage: can't open output file\n");return -1;}putshort(of, 474);       /* MAGIC               */putbyte(of, 0);          /* STORAGE is VERBATIM */putbyte(of, 1);          /* BPC is 1            */putshort(of, 3);         /* DIMENSION is 2      */putshort(of, IXSIZE);    /* XSIZE               */putshort(of, IYSIZE);    /* YSIZE               */putshort(of, 3);         /* ZSIZE               */putlong(of, 0);          /* PIXMIN is 0         */putlong(of, 255);        /* PIXMAX is 255       */for (i = 0; i<4; i++)      /* DUMMY 4 bytes       */putbyte(of, 1);//strcpy(iname, "11111111111111111111111111111111111111111111111111111111111111111111111111111111");fwrite(iname, 80, 1, of);  /* IMAGENAME           */putlong(of, 0);          /* COLORMAP is 0       */for (i = 0; i<404; i++)    /* DUMMY 404 bytes     */putbyte(of, 0);for (int z = 0; z<3; z++){for (y = 0; y<IYSIZE; y++) {for (x = 0; x < IXSIZE; x++){Vec3b vec3 = img.at<Vec3b>(IXSIZE-1-y, x);if (z == 0){if (vec3[2] == 10)vec3[2] = vec3[2] - 1;outbuf[x] = vec3[2];if(sizeof(vec3[2])!=1)printf("%d\n", sizeof(vec3[2]));if (vec3[2] > 255 || vec3[2] < 0)printf("hrer\n");}if (z == 1){//if (x > 128 && y < 128)//	outbuf[x] = 255;//elseif (vec3[1] == 10)vec3[1] = vec3[1] - 1;outbuf[x] = vec3[1];}if (z == 2){//if (x < 128 && y>128)//{//	outbuf[x] = 255;//	}//elseif (vec3[0] == 10)vec3[0] = vec3[0] - 1;outbuf[x] = vec3[0];}}fwrite(outbuf, IXSIZE, 1, of);}}printf("sunccess\n");fclose(of);system("pause");
}

寫入像素10會有意想不到的錯誤，所以把像素10都改為了9

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