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date Tue, 18 Mar 2025 16:23:26 -0400
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1 '\" t
2 .\" Title: gifbg
3 .\" Author: [see the "Author" section]
4 .\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
5 .\" Date: 2 May 2012
6 .\" Manual: GIFLIB Documentation
7 .\" Source: GIFLIB
8 .\" Language: English
9 .\"
10 .TH "GIFBG" "1" "2 May 2012" "GIFLIB" "GIFLIB Documentation"
11 .\" -----------------------------------------------------------------
12 .\" * Define some portability stuff
13 .\" -----------------------------------------------------------------
14 .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
15 .\" http://bugs.debian.org/507673
16 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
17 .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
18 .ie \n(.g .ds Aq \(aq
19 .el .ds Aq '
20 .\" -----------------------------------------------------------------
21 .\" * set default formatting
22 .\" -----------------------------------------------------------------
23 .\" disable hyphenation
24 .nh
25 .\" disable justification (adjust text to left margin only)
26 .ad l
27 .\" -----------------------------------------------------------------
28 .\" * MAIN CONTENT STARTS HERE *
29 .\" -----------------------------------------------------------------
30 .SH "NAME"
31 gifbg \- generate a test\-pattern GIF
32 .SH "SYNOPSIS"
33 .HP \w'\fBgifbg\fR\ 'u
34 \fBgifbg\fR [\-v] [\-d\ \fIdir\fR] [\-l\ \fIlvls\fR] [\-c\ \fIR\fR\ \fIG\fR\ \fIB\fR] [\-m\ \fImin\fR] [\-o\ \fImax\fR] [\-s\ \fIw\fR\ \fIh\fR] [\-h]
35 .SH "DESCRIPTION"
36 .PP
37 A program to generate a single\-color test pattern GIF with gradually changing intensity in any of the basic 8 directions\&.
38 .PP
39 The gifbg program reads no input, and will dump the created GIF file to stdout\&.
40 .SH "OPTIONS"
41 .PP
42 \-v
43 .RS 4
44 Verbose mode (show progress)\&. Enables printout of running scan lines\&.
45 .RE
46 .PP
47 \-d dir
48 .RS 4
49 Select direction the intensity of the background should increase\&. Direction can be one of the 8 principal directions:
50 .PP
51 "T"
52 .RS 4
53 for Top
54 .RE
55 .PP
56 "TR"
57 .RS 4
58 for Top Right
59 .RE
60 .PP
61 "R"
62 .RS 4
63 for Right
64 .RE
65 .PP
66 "BR"
67 .RS 4
68 for Bottom Right
69 .RE
70 .PP
71 "B"
72 .RS 4
73 for Bottom
74 .RE
75 .PP
76 "BL"
77 .RS 4
78 for Bottom Left
79 .RE
80 .PP
81 "L"
82 .RS 4
83 for left
84 .RE
85 .PP
86 "TL"
87 .RS 4
88 for Top Left
89 .RE
90 .sp
91 The compass directions may be use as synonyms for the above directions, so for example "NE" is equal to "TR"\&.
92 .sp
93 Direction is case insensitive\&. The default direction is Top (North)\&.
94 .RE
95 .PP
96 \-l lvls
97 .RS 4
98 Numeric, nmber of levels the color will be scaled to\&. Default is 16\&.
99 .RE
100 .PP
101 \-c R G B
102 .RS 4
103 What to use as the primary background color to scale\&. This color is scaled between the minimum intensity (min) and maximum intensity (max) from one end of the screen to the other as defined by dir\&. See below (\-m & \-M) for min & max\&. Default is Blue (0, 0, 255)\&.
104 .RE
105 .PP
106 \-m min
107 .RS 4
108 Minimum intensity (in percent) to scale color\&. Default 10%
109 .RE
110 .PP
111 [\-M max
112 .RS 4
113 Maximum intensity (in percent) to scale color\&. Default 100%
114 .RE
115 .PP
116 \-s W H
117 .RS 4
118 Size of image to create\&. Default 640 by 350\&.
119 .RE
120 .PP
121 \-h
122 .RS 4
123 Print one line of command line help, similar to Usage above\&.
124 .RE
125 .PP
126 If min == max = 100 (%) and lvls == 2 then boolean mask image of specified size will be created \- all foreground\&.
127 .SH "AUTHOR"
128 .PP
129 Gershon Elber\&.