FBCLEAN(1) USER COMMANDS FBCLEAN(1) NAME fbclean - flip isolated pixels in a 1bit image SYNOPSIS fbclean [ -b -t -n ] [ - ] < bitmap > bitmap DESCRIPTION Flips isolated pixels (this can be used to clean up "snow" in some halftoned images. Can also convert a grayscale image to bitmap by theshholding before the cleaning is done. OPTIONS -b _c_l_e_a_n_e_r option, specifies the minimum number of "nearby" like pixels to remain the same color. -n _n_e_i_g_h_b_o_r_s, the size of the neighborhood. To be "nearby" means to be located in an NxN square around the target pixel. -t _t_h_r_e_s_h_h_o_l_d command, used to halftone the image before cleaning. The default is no theshholding. -B _f_a_c_e format, as used by Bennet Yee's _f_a_c_e program at CMU. -F _F_B_M, format (by default, the default). You are guaranteed not to lose information by specifying FBM as the default. -G _G_I_F, Compuserve GIF format. -I _I_F_F format, interleaved bitmaps (ILBM), used by Amigas. -P _P_B_M, Jef Poskanzer's bitmap format. -S _s_u_n, Sun rasterfiles (not run length encoded). EXAMPLE To take a bitmap and clean up pixels with fewer than 2 like neighbors in the surrounding 5x5 square, outputing s Sun rasterfile: % fbclean -S -b2 -n5 < foo.1bit > bar.1bit To do the same thing to a grayscale file (threshholding first with 128): % fbclean -S -b2 -n5 -t128 < foo.1bit > bar.1bit SEE ALSO fbm(1) for general discussion, pbm(1) for PBM routines. Sun Release 4.0 Last change: 07-Mar-89 1 FBCLEAN(1) USER COMMANDS FBCLEAN(1) BUGS None known. HISTORY Copyright (c) 1989 by Michael L. Mauldin. Permission is granted to use this program in whole or in part provided that you do not sell it for profit and that this copyright notice is retained unchanged. 07-Mar-89 Michael L. Mauldin at Carnegie Mellon University Beta release (version 0.9) mlm@cs.cmu.edu Sun Release 4.0 Last change: 07-Mar-89 2