图片ppm编码格式

P3　　    #ASCII格式图片为 p3
64 64　　 #width height
255　　　 #RGB
255 0 0
255 0 0
......
255 0 0
255 0 0
255 0 0
255 0 0
255 0 0

0000000: 5036 0a36 3420 3634 0a32 3535 0aff 0000  P6.64 64.255....
0000010: ff00 00ff 0000 ff00 00ff 0000 ff00 00ff  ................
0000020: 0000 ff00 00ff 0000 ff00 00ff 0000 ff00  ................
0000030: 00ff 0000 ff00 00ff 0000 ff00 00ff 0000  ................
0000040: ff00 00ff 0000 ff00 00ff 0000 ff00 00ff  ................

 1 #include 
 2 
 3 #define _VPATH "./../cfg/"
 4 
 5 #define _B 1
 6 #define PICNUM 5
 7 
 8 int main(int argc, char *argv[])
 9 {
10     if(argc != 2)
11     {
12         printf("please argc 0 or 1\n");
13         printf("0: binary image\n");
14         printf("1: decimal image\n");
15         return 0;
16     }
17     
18     int iflag = atoi(argv[1]);
19     
20     int i, k;
21     unsigned char r[PICNUM] = {0xFF, 0xFF, 0x0, 0x0, 0xFF}; 
22     unsigned char g[PICNUM] = {0x0, 0xFF, 0x0, 0x0, 0xFF};
23     unsigned char b[PICNUM] = {0x0, 0x0, 0xFF, 0x0, 0xFF};
24     FILE *fp;
25     char fname[PICNUM][100];
26     
27     if(iflag == 0)
28     {
29         sprintf(fname[0], "%s%s", _VPATH, "B_red.ppm");
30         sprintf(fname[1], "%s%s", _VPATH, "B_yellow.ppm");
31         sprintf(fname[2], "%s%s", _VPATH, "B_blue.ppm");
32         sprintf(fname[3], "%s%s", _VPATH, "B_black.ppm");
33         sprintf(fname[4], "%s%s", _VPATH, "B_white.ppm");
34     }
35     
36     if(iflag == 1)
37     {
38         sprintf(fname[0], "%s%s", _VPATH, "D_red.ppm");
39         sprintf(fname[1], "%s%s", _VPATH, "D_yellow.ppm");
40         sprintf(fname[2], "%s%s", _VPATH, "D_blue.ppm");
41         sprintf(fname[3], "%s%s", _VPATH, "D_black.ppm");
42         sprintf(fname[4], "%s%s", _VPATH, "D_white.ppm");
43     }
44     
45     for(k = 0; k )
46     {
47         
48         if(iflag == 0)
49         {
50             fp = fopen(fname[k], "wb");
51             if(fp == NULL) 
52             {
53                 printf("ERR001: open file error [%s]\n", fname);
54                 return 0;
55             }
56             fprintf(fp, "%s\n", "P6");
57             fprintf(fp, "%s\n", "64 64");
58             fprintf(fp, "%s\n", "255");
59             for(i = 0; i <64 * 64; i++)
60             {
61                 fwrite(&r[k], 1, 1, fp);
62                 fwrite(&g[k], 1, 1, fp);
63                 fwrite(&b[k], 1, 1, fp);
64             }
65             fclose(fp);
66         }
67     
68         if(iflag == 1)
69         {
70             fp = fopen(fname[k], "w");
71             if(fp == NULL) 
72             {
73                 printf("ERR001: open file error [create_ppm]\n");
74                 return 0;
75             }
76             fprintf(fp, "%s\n", "P3");
77             fprintf(fp, "%s\n", "64 64");
78             fprintf(fp, "%s\n", "255");
79             for(i = 0; i <64 * 64; i++)
80             {
81                 fprintf(fp, "%d %d %d\n", r[k], g[k], b[k]);
82             }
83             fclose(fp);
84         }
85     }
86     return 1;
87 }

 1     if(iflag == 3)
 2     {
 3         int c;
 4         char fname_D[100];
 5         int w = 50, h = 50;
 6         sprintf(fname_D, "%s%s", _VPATH, "D_image.ppm");
 7         
 8         fp = fopen(fname_D, "w");
 9         if(fp == NULL) 
10         {
11             printf("ERR003: open file error [%s]\n", fname_D);
12             return 0;
13         }
14         fprintf(fp, "%s\n", "P3");
15         fprintf(fp, "%s\n", "150 100");
16         fprintf(fp, "%s\n", "255");
17         for(i = 0; i )
18         {
19             for(c = 0; c )
20             {
21                 fprintf(fp, "%d %d %d\n", 0xFF, 0x0, 0x0);
22             }
23             for(c = 0; c )
24             {
25                 fprintf(fp, "%d %d %d\n", 0xFF, 0xFF, 0x0);
26             }
27             for(c = 0; c )
28             {
29                 fprintf(fp, "%d %d %d\n", 0xFF, 0xF1, 0xFF);
30             }
31         }
32         
33         for(i = 0; i )
34         {
35             for(c = 0; c )
36             {
37                 fprintf(fp, "%d %d %d\n", 0x0, 0x0, 0xFF);
38             }
39             for(c = 0; c )
40             {
41                 fprintf(fp, "%d %d %d\n", 0xFF, 0x1F, 0xFF);
42             }
43             for(c = 0; c )
44             {
45                 fprintf(fp, "%d %d %d\n", 0x0, 0xa0, 0x0);
46             }
47         }
48         fclose(fp);
49         
50     }