灰度图像转换.img到.ras – 在Windows中的白色和蓝色的灰度等级？！ C
我想将.img文件（512字节标题，512×512像素，每像素8位（值：0-255））转换为.ras文件。 为此，我在本文末尾得到了C代码。 我的测试图像（test.img）的输出应该是黑/白图像 – 所以只包含0或255的值。但问题是，当我在Windows中编译C代码（从底部）时，我的结果。 ras文件是白色还是亮蓝色？！ 奇怪的是。 当我在Linux中编译C代码时，结果是完全黑/白？！ 这怎么来的？ 在两个系统中我使用了64位。
所以你可以尝试一下：1。用以下代码编译C代码：gcc -lm img2ras.c -o img2ras 2.通过控制台将.img转换为.ras：img2ras test.img test.ras 3.在gimp中观察.ras文件，XnView或PaintshopPro
你是否有任何线索如何在具有相同版本的gcc 4.8.1的不同操作系统上发生这种尴尬的结果？
test.img： http ： //www.file-upload.net/download-8629102/test.img.html
img2ras.c
/* this program accepts an input file (which comes from the image capturing board) and an output file, which must be specified on the command line. The output file is a Sun rasterfile. usage : img2ras capfilename rastfilename This program was written by Chuck Horne and butchered by Mark Holcomb*/ #include #include #include #include main(argc,argv) int argc; char *argv[]; { /**********declarations**********/ int fd_in,fd_out; /* long int buf[8]; this is for the integers in the header*/ static char buf[] = { 0x59, 0xa6, 0x6a, 0x95, 0x0, 0x0, 0x2, 0x0, 0x0, 0x0, 0x2, 0x0, 0x0, 0x0, 0x0, 0x8, 0x0, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x3, 0x0, 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 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0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0, 0xc2, 0xc2, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc8, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd2, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe3, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xeb, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf3, 0xf5, 0xf5, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfb, 0xfd, 0xfd, 0xff, 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0, 0xc2, 0xc2, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc8, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd2, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe3, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xeb, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf3, 0xf5, 0xf5, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfb, 0xfd, 0xfd, 0xff }; char pixels[1024]; /*this is for the 8-bit pixels*/ unsigned int ct; char infile[36]; char outfile[38]; char *T_pixels; /*rotate through 2 rows of input*/ int even=1; int dummy; /*first, set up the file i/o*/ strcpy(infile,argv[1]); strcpy(outfile,argv[2]); if ((fd_in=open(infile,0))<2) { printf("can't open %s\n",infile); exit(1); } if ((fd_out=open(outfile,O_WRONLY|O_CREAT,0600))<2) { printf("can't open %s\n",outfile); exit(1); } /*now insert the raster header (a color raster with lut of 1,1,1:2,2,2:etc) */ /* now write this stuff out */ if (write(fd_out,(char *)buf,800)!=800) { printf("can't write out the header\n"); exit(1); } /*have to throw out the first 512 in img*/ if (read(fd_in,pixels,512)<0) { printf("can't read the header of %s\n",infile); exit(1); } /* now start slapping the pixels in behind it */ for (ct=0;ct<512;ct++) { if (even) T_pixels=pixels; else T_pixels=(char *)(&pixels[512]); even=!even; if (read(fd_in,T_pixels,512)<0) { printf("can't read in pixels, line %d\n",ct); exit(1); } if ((dummy=write(fd_out,T_pixels,512))<0) { printf("file descriptor is %d ",fd_out); printf("error number is %d\n",errno); printf("can't write out pixels, line %d\n",ct); printf("dummy value is %d\n",dummy); exit(1); } } /*now close the files and tidy up*/ close(fd_in); close(fd_out); } /* ends main */ 好的，我对此没有任何解释，但至少我得到了它的工作。 如果我将img2ras.c代码放入我的C ++代码中，就像在本文的底部，并在我的项目中调用它，一切都结果正确？！ 所以这意味着：如果我通过命令行编译.c代码，我得到一个蓝色图像，如果我在eclipse中编译相同的代码，我得到黑/白图像！ 这可能与MinGW和cygwin64有关吗？ 我很困惑，但同时也很开心:)！
#include #include #include #include #include #include /* this program accepts an input file (which comes from the image capturing board) and an output file, which must be specified on the command line. The output file is a Sun rasterfile. usage : img2ras capfilename rastfilename This program was written by Chuck Horne and butchered by Mark Holcomb*/ void img_to_ras(FILE *fp_in, FILE *fp_out) { /**********declarations**********/ int fd_in, fd_out; /* long int buf[8]; this is for the integers in the header*/ static char buf[] = { 0x59, 0xa6, 0x6a, 0x95, 0x0, 0x0, 0x2, 0x0, 0x0, 0x0, 0x2, 0x0, 0x0, 0x0, 0x0, 0x8, 0x0, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x3, 0x0, 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 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0xf3, 0xf5, 0xf5, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfb, 0xfd, 0xfd, 0xff }; char pixels[1024]; /*this is for the 8-bit pixels*/ unsigned int ct; char infile[36]; char outfile[38]; char *T_pixels; /*rotate through 2 rows of input*/ int even = 1; int dummy; // FILE* fp_out = NULL; /*first, set up the file i/o*/ //strcpy_s(infile, argv[1]); //strcpy_s(outfile, argv[2]); /*#ifdef DEBUG fopen_s(&fp_in, "D:\\ComputerVision\\code\\comb.img", "rb"); fopen_s(&fp_out, "D:\\ComputerVision\\code\\comb_out_testing.ras", "wb"); #else //fopen_s(&fp_in, "D:\\ComputerVision\\code\\comb_out_x.img", "rb"); fopen_s(&fp_in, "D:\\ComputerVision\\code\\label.img", "rb"); fopen_s(&fp_out, "D:\\ComputerVision\\code\\comb_out_final.ras", "wb"); #endif*/ /*now insert the raster header (a color raster with lut of 1,1,1:2,2,2:etc) */ /* now write this stuff out */ fwrite(buf, 1, 800, fp_out); /*have to throw out the first 512 in img*/ fread(pixels, 1, 512, fp_in); /* now start slapping the pixels in behind it */ for (ct = 0; ct<512; ct++) { if (even) T_pixels = pixels; else T_pixels = (char *) (&pixels[512]); even = !even; fread(T_pixels, 1, 512, fp_in); fwrite(T_pixels, 1, 512, fp_out); } /*now close the files and tidy up*/ // fclose(fp_in); // fclose(fp_out); }