質問編集履歴
2
追記
test
CHANGED
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File without changes
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test
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@@ -251,3 +251,11 @@
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251
251
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252
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253
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```
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254
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255
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256
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追記
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258
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259
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皆様のコメントのおかげで出来ました。
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260
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261
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ありがとうございます。
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1
プログラムを追加しました
test
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File without changes
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test
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@@ -21,3 +21,233 @@
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21
21
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22
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Macのターミナルでやっています。
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24
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25
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プログラムはこのようにしてやっています。
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26
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27
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```
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28
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29
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#include <stdio.h>
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30
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31
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#include <stdlib.h>
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32
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33
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#include <math.h>
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34
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35
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36
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37
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unsigned char *read_ppm(char *fname, int *width, int *height);
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38
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39
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void save_pgm(char *fanme, unsigned char *gray, int width, int height);
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40
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41
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42
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int main(int argc, char* argv[])
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44
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45
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{
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46
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47
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int width, height; /*入力画像サイズ*/
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48
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49
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unsigned char *src, *out; /*白黒画像:それぞれ入力用と出力用に対応*/
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50
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51
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52
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53
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int f; /*入力の画素値*/
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54
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55
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int g[256] = {0};/*出力の画素値*/
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56
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57
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58
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59
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int f_L = 0,f_H = 75;
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60
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61
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62
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63
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/*カラー画像ファイルを白黒化して読み込み*/
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64
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65
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src = read_ppm(argv[1], &width, &height);
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66
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67
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/*出力画像の保存*/
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68
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69
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save_pgm(argv[2], src, width, height);
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70
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71
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free(src);
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72
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return 0;
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74
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75
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}
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77
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78
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79
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unsigned char *read_ppm(char *fname, int *width, int *height)
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80
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81
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{
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82
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83
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char str[256], c;
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84
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85
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int max=0;
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86
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87
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88
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89
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unsigned char *gray = NULL;
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90
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91
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int r=0,g=0,b=0;
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92
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93
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int size=0;
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94
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95
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int i;
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96
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97
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98
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99
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FILE *fp=fopen(fname,"rb");
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100
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101
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if(fp==NULL){
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102
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103
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fprintf(stderr, "error: %s cannot open!\n",fname);
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104
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105
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exit(-1);
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106
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107
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}
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108
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109
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110
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111
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/*-----------------Magic number------------*/
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112
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113
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fscanf(fp, "%s", str);
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114
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115
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116
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117
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c = str[1];
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118
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119
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if(c=='3'||c=='6'){
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120
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121
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122
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123
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/*-------------comment, space, or size ------------*/
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125
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fscanf(fp, "%s", str);
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127
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128
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129
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if(str[0]=='#'||str[0]==' '){
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130
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131
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while(fscanf(fp,"%c",&str[0])){/* comment skip*/
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132
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133
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if(str[0]=='\n')
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134
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135
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break;
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136
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137
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}
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138
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139
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fscanf(fp, "%d %d",width,height);
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140
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141
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}
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142
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143
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else{
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144
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145
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scanf(str,"%d",width);
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146
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147
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fscanf(fp, "%d",height);
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148
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149
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}
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150
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151
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152
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153
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/* ------------ comment, space, or max value ---------- */
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154
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155
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fscanf(fp, "%d", &max);
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156
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157
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158
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159
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/* ------------ memory create ---------- */
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160
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161
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size = (*width) * (*height);
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162
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163
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gray = (unsigned char *)malloc(size);
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164
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165
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166
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167
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/* ------------ pixel value ---------- */
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168
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169
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if(c == '3'){ /* テキストデータ */
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170
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171
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for(i = 0; i < size; i++){
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172
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173
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fscanf(fp, "%d %d %d", &r, &g, &b);
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174
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175
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gray[i] = (unsigned char)(0.299 * r + 0.587 * g + 0.114 * b + 0.5);
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176
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177
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}
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178
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179
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}
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180
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181
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else{ /* バイナリデータ */
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182
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183
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fread(&r,1,1,fp); /* LF */
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184
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+
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185
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186
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187
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for(i = 0; i < size; i++){
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188
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189
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fread(&r,1,1,fp);
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190
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191
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fread(&g,1,1,fp);
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192
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193
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fread(&b,1,1,fp);
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194
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195
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196
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197
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gray[i] = (unsigned char)(0.299 * r + 0.587 * g + 0.114 * b + 0.5);
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198
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199
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}
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200
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+
|
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201
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+
}
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202
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+
|
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203
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+
}
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204
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205
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else
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206
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207
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fprintf(stderr, "[%s] is not a ppm-file!\n", fname);
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208
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209
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fclose(fp);
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210
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+
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211
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return gray;
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212
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+
|
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213
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+
}
|
|
214
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+
|
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215
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+
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216
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217
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+
void save_pgm(char *fname, unsigned char *gray, int width, int height)
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218
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+
|
|
219
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+
{
|
|
220
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+
|
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221
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+
int x, y;
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222
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+
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223
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+
FILE *fp = fopen(fname, "w");
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224
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+
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225
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+
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226
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+
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227
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fprintf(fp, "P2\n");
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228
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+
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229
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+
fprintf(fp, "%d %d\n", width, height);
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|
230
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+
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231
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+
fprintf(fp, "255\n");
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232
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+
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233
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+
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234
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+
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235
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+
for(y = 0; y < height; y++){
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236
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+
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237
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+
for(x = 0; x < width; x++)
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238
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+
|
|
239
|
+
fprintf(fp, "%d ", gray[width * y + x]); /* (注) %d の後にスペースあり */ fprintf(fp, "\n");
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|
240
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+
|
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241
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+
}
|
|
242
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+
|
|
243
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+
|
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244
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+
|
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245
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+
fclose(fp);
|
|
246
|
+
|
|
247
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+
return;
|
|
248
|
+
|
|
249
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+
}
|
|
250
|
+
|
|
251
|
+
|
|
252
|
+
|
|
253
|
+
```
|