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1 .\"
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2 .\" cmp_pgm.1 - the *roff document processor man page source
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3 .\"
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4 .TH cmp_pgm 1 "98/07/08" "Watermarking, Version 1.0"
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5 .SH NAME
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6 cmp_pgm \- a program to create the difference image of two PGM images
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7 .SH SYNOPSIS
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8 .B cmp_pgm
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9 [
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10 .B \-h
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11 ]
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12 [
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13 .BI \-m \ number
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14 ]
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15 [
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16 .BI \-o \ ofile
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17 ]
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18 .BI \-i \ ifile
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19 .I file
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20 .SH DESCRIPTION
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21 .B cmp_pgm
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22 is a program to create the difference image of two PGM (portable graymap)
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23 grayscale images. To compare PPM (portable pixmap) RGB color images, use the
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24 .B cmp_ppm
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25 program.
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26 .PP
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27 If
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28 .I file
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29 or
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30 .I ofile
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31 is not specified, then standard input or standard output is
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32 used.
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33 .PP
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34 .SH OPTIONS
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35 .TP
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36 .B \-h
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37 Print a help message.
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38 .TP
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39 .BI \-i \ ifile
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40 The original image. Mandatory.
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41 .TP
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42 .BI \-m \ number
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43 Multiplication factor to magnify differences between the to
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44 original and input image.
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45 Default value: 16.
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46 .TP
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47 .BI \-o \ ofile
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48 Output image file to contain the difference image in PGM format.
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49 .TP
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50 .I file
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51 Input image that is compared against
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52 .I ifile.
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53 Default: standard input.
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54 .SH OUTPUT
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55 The difference image in PGM format is written to standard output or,
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56 optionally, to
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57 .I ofile.
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58 .SH AUTHOR
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59 Peter Meerwald.
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60 Email bug reports to pmeerw@cosy.sbg.ac.at.
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61 .SH AVAILABILITY
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62 The most recent released version of
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63 .B cmp_pgm
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64 is always available
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65 at http://www.cosy.sbg.ac.at/~pmeerw/Watermarking or via anonymous ftp from ftp.cosy.sbg.ac.at in the
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66 directory /pub/people/pmeerw/Watermarking.
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67 .SH "SEE ALSO"
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68 .B cmp_ppm
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69 (1)
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