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comparison Meerwald-dir/cmp_ppm.1 @ 24:9f20bce6184e v0.7
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| author | Peter Meerwald-Stadler <pmeerw@pmeerw.net> |
|---|---|
| date | Fri, 20 Dec 2024 13:08:59 +0100 |
| parents | Meerwald/cmp_ppm.1@be303a3f5ea8 |
| children |
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| 23:71dd4b96221b | 24:9f20bce6184e |
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| 1 .\" | |
| 2 .\" cmp_ppm.1 - the *roff document processor man page source | |
| 3 .\" | |
| 4 .TH cmp_ppm 1 "98/07/08" "Watermarking, Version 1.0" | |
| 5 .SH NAME | |
| 6 cmp_ppm \- a program to create the difference image of two PGM images | |
| 7 .SH SYNOPSIS | |
| 8 .B cmp_ppm | |
| 9 [ | |
| 10 .BI \-c \ name | |
| 11 ] | |
| 12 [ | |
| 13 .B \-h | |
| 14 ] | |
| 15 [ | |
| 16 .BI \-m \ number | |
| 17 ] | |
| 18 [ | |
| 19 .BI \-o \ ofile | |
| 20 ] | |
| 21 .BI \-i \ ifile | |
| 22 .I file | |
| 23 .SH DESCRIPTION | |
| 24 .B cmp_ppm | |
| 25 is a program to create the difference image of two PPM (portable pixmap) | |
| 26 RGB color images. To compare PGM (portable graymap) grayscale images, use | |
| 27 the | |
| 28 .B cmp_pgm | |
| 29 program. | |
| 30 .PP | |
| 31 The color components to compare are specified with the | |
| 32 .BI \-c \ name | |
| 33 option, where | |
| 34 .I name | |
| 35 is one of the following: | |
| 36 .TP | |
| 37 .B red | |
| 38 The red color component. | |
| 39 .TP | |
| 40 .B green | |
| 41 The green color component. | |
| 42 .TP | |
| 43 .B blue | |
| 44 The blue color component. | |
| 45 .PP | |
| 46 Multiple color components are allowed. Specifying only the inital letter | |
| 47 of a color component is sufficient. | |
| 48 Per default | |
| 49 .B cmp_ppm | |
| 50 compares the luminance value of the images. This operation may be | |
| 51 selected explicitly with the | |
| 52 .BI \-c \ luminance | |
| 53 option. | |
| 54 .PP | |
| 55 If | |
| 56 .I file | |
| 57 or | |
| 58 .I ofile | |
| 59 is not specified, then standard input or standard output is | |
| 60 used. | |
| 61 .PP | |
| 62 .SH OPTIONS | |
| 63 .TP | |
| 64 .BI \-c \ name | |
| 65 Specifies color component(s) or luminance to compare. Default: luminance. | |
| 66 .TP | |
| 67 .B \-h | |
| 68 Print a help message. | |
| 69 .TP | |
| 70 .BI \-i \ ifile | |
| 71 The original image. Mandatory. | |
| 72 .TP | |
| 73 .BI \-m \ number | |
| 74 Multiplication factor to magnify differences between the to | |
| 75 original and input image. | |
| 76 Default value: 16. | |
| 77 .TP | |
| 78 .BI \-o \ ofile | |
| 79 Output image file to contain the difference image in PPM format. | |
| 80 .TP | |
| 81 .I file | |
| 82 Input image that is compared against | |
| 83 .I ifile. | |
| 84 Default: standard input. | |
| 85 .SH OUTPUT | |
| 86 The difference image in PPM format is written to standard output or, | |
| 87 optionally, to | |
| 88 .I ofile. | |
| 89 .SH AUTHOR | |
| 90 Peter Meerwald. | |
| 91 Email bug reports to pmeerw@cosy.sbg.ac.at. | |
| 92 .SH AVAILABILITY | |
| 93 The most recent released version of | |
| 94 .B cmp_ppm | |
| 95 is always available | |
| 96 at http://www.cosy.sbg.ac.at/~pmeerw/Watermarking or via anonymous ftp from ftp.cosy.sbg.ac.at in the | |
| 97 directory /pub/people/pmeerw/Watermarking. | |
| 98 .SH "SEE ALSO" | |
| 99 .B cmp_ppm | |
| 100 (1) |