.TH IMGDPCMENCODE 1 "QCCPACK" "".SH NAMEimgdpcmencode,imgdpcmdecode\- encode and decode an image using DPCM.SH SYNOPSIS.B imgdpcmencode.RB "[\|" \-p.IR predictor "\|]".I imgfile.I quantizers....I channels....br.sp.B imgdpcmdecode.RB "[\|" \-p.IR predictor "\|]".I imagewidth.I imageheight.I quantizers....I channels....I imgfile.SH OPTIONS.TP.BI \-p " predictor"Predictor code to be used for DPCM. The default code is 2..SH DESCRIPTION.LP.B imgdpcmencodeencodes an image using two-dimensional DPCM.DPCM encoding is accomplished by calling.BR QccIMGImageDPCMEncode (3) ;essentially, DPCM isapplied to each image component (Y, U, V) separately.A separate.IR channelfile (CHN format) is output for each component..LP.B imgdpcmdecodeperforms decoding of .I channelsproduced by.BR imgdpcmencode (1),outputting the reconstructed image to.IR imgfile ..B imgdpcmdecodecan produce grayscale (PGM) or color (PPM) images.In the case of color images,DPCM decoding is applied to each image component (Y, U, V) separately..LPFor color images,.B imgdpcmencodeand.B imgdpcmdecodeexpect to be given three scalar.IR  quantizers ,one for each of the Y, U, and V components, respectively,of the image.Additionally, channel indices are written to orread from three separate channel files.RI ( channels ).For grayscale images, only one.I quantizerand one.I channelneed be specified..LPThe .B \-p option specifies the .I predictorcode to be used.See.BR QccIMGImageDPCMEncode (3)for valid values..SH "SEE ALSO".BR QccIMGImageDPCMEncode (3) ,.BR QccIMGImageDPCMDecode (3) ,.BR QccIMGImage (3),.BR QccPackIMG (3),.BR QccPack (3)A. K. Jain,.IR "Fundamentals of Digital Image Processing" .Englewood Cliffs, NJ: Prentice Hall, 1989, pp. 483-498..SH AUTHORCopyright (C) 1997-2005  James E. Fowler.\"  The programs herein are free software; you can redistribute them and/or.\"  modify them under the terms of the GNU General Public License.\"  as published by the Free Software Foundation; either version 2.\"  of the License, or (at your option) any later version..\"  .\"  These programs are distributed in the hope that they will be useful,.\"  but WITHOUT ANY WARRANTY; without even the implied warranty of.\"  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the.\"  GNU General Public License for more details..\"  .\"  You should have received a copy of the GNU General Public License.\"  along with these programs; if not, write to the Free Software.\"  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.