{ unsigned char *p,*q,cc,ch; long len; int max-no, i,j,m,n,r0,b0,g0,r1,b1,g1; double dd,dmin; char s[4]; max-no=color2-color1+1; for (i=0;i<256;i++) tab[i]=0; p=(char *)malloc(bytes+1); for (i=0;i<depth;i++) { fread(p,bytes,1,fp); q=p; for (j=0;j<bytes;j++,q++) if(j>=width) break; else { ch=(unsigned char)*q; tab[ch]++; } } for (i=0;i<256;i++) tt[i]=(unsigned char)i; for (i=0;i<255;i++) for (j=i+1;j<256;j++) if (tab[i]<tab[j]){ len=tab[i];tab[i]=tab[j];tab[j]=len; cc=tt[i];tt[i]=tt[j];tt[j]=cc; memcpy(s,&palette[i][0],4); memcpy(&palette[i][0],&palette[j][0],4); memcpy(&palette[j][0],s,4); } for (i=color2;i>=color1;i--) memcpy(&palette[i][0],&palette[i-color1][0],4); for (i=0;i<max-no;i++) bb[tt[i]]=(unsigned char)i; for (i=max-no;i<256;i++) { r0=palette[i][2]; g0=palette[i][1]; b0=palette[i][0]; dmin=256.0*256.0*256.0; m=0; for (j=0;j<max-no;j++) { r1=palette[j][2]; g1=palette[j][1]; b1=palette[j][0]; dd=1.0*(r0-r1)*(r0-r1)+1.0*(g0-g1)*(g0-g1)+1.0*(b0-b1)*(b0-b1); dd=sqrt(dd); if (dmin>dd) {dmin=dd;m=j;} } bb[tt[i]]=(unsigned char)m; } for (i=0;i<256;i++) bb[i]+=color1; } void w-create-bitmap(file *fp) { int i,j,n,m,t; long len; unsigned char far *p,far *q,cc,ch; unsigned nn; fseek(fp,54l,seek-set); len=ftell(fp); fwrite(&palette[0][0],4,256,fp); p=(unsigned char far *)farmalloc(bytes+1); len=ftell(fp); for (i=0;i<depth;i++) { fseek(fp,len,seek-set); fread(p,bytes,1,fp); fseek(fp,len,seek-set); len+=bytes; q=p; for (j=0;j<width;j++,q++) { cc=(unsigned char)(*q); ch=bb[cc]; *q=ch; } fwrite(p,bytes,1,fp); } farfree(p); } main(int argc,char *args[]) { file *fp; if (argc<4) { printf(参数:文件名 颜色下限 颜色上限\n); return; } fp=get-bitmap-file(args[1]); if (fp==null) return; zh-fan-tu(fp,atoi(args[2],atoi(args[3])); w-create-bitmap(fp); fclose(fp); } 参考文献 王旭 张军译.microsoft windows 3.1程序员参考手册.北京:清华大学出版社,1994. 作者：王玉增

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