tjpg.1 - plan9port - [fork] Plan 9 from user space
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tjpg.1 (4846B)
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1 .TH JPG 1
2 .SH NAME
3 jpg, gif, png, ppm, bmp, yuv, ico, togif, toppm, topng, toico \- view and convert pictures
4 .SH SYNOPSIS
5 .B jpg
6 [
7 .B -39cdefFkJrtv
8 ] [
9 .I file ...
10 ]
11 .br
12 .B gif
13 [
14 .B -39cdektv
15 ] [
16 .I file ...
17 ]
18 .br
19 .B png
20 [
21 .B -39cdektv
22 ] [
23 .I file ...
24 ]
25 .br
26 .B ppm
27 [
28 .B -39cdektv
29 ] [
30 .I file ...
31 ]
32 .br
33 .B bmp
34 [
35 .I file
36 ]
37 .br
38 .B yuv
39 [
40 .I file
41 ]
42 .PP
43 .B togif
44 [
45 .B -c
46 .I comment
47 ] [
48 .B -l
49 .I loopcount
50 ] [
51 .B -d
52 .I msec
53 ] [
54 .B -t
55 .I transindex
56 ] [
57 .I file ...
58 [
59 .B -d
60 .I msec
61 ]
62 .I file ...
63 ]
64 .br
65 .B toppm
66 [
67 .B -c
68 .I comment
69 ] [
70 .I file
71 ]
72 .br
73 .B topng
74 [
75 .B -c
76 .I comment
77 ] [
78 [
79 .B -g
80 .I gamma
81 ] [
82 .I file
83 ]
84 .PP
85 .B ico
86 [
87 .I file
88 ]
89 .br
90 .B toico
91 [
92 .I file ...
93 ]
94 .SH DESCRIPTION
95 These programs read, display, and write image files in public formats.
96 .IR Jpg ,
97 .IR gif ,
98 .IR png ,
99 .IR ppm ,
100 .IR bmp ,
101 and
102 .IR yuv .
103 read files in the corresponding formats and, by default, display
104 them in the current window; options cause them instead to convert the images
105 to Plan 9 image format and write them to standard output.
106 .IR Togif ,
107 .IR Toppm ,
108 and
109 .I topng
110 read Plan 9 images files, convert them to GIF, PPM, or PNG, and write them to standard output.
111 .PP
112 The default behavior of
113 .IR jpg ,
114 .IR gif ,
115 and
116 .IR ppm
117 is to display the
118 .IR file ,
119 or standard input if no file is named.
120 Once a file is displayed, typing a character causes the program to display the next image.
121 Typing a
122 .BR q ,
123 DEL, or control-D exits the program.
124 For a more user-friendly interface, use
125 .MR page (1) ,
126 which invokes these programs to convert the images to standard format,
127 displays them, and offers scrolling, panning, and menu-driven navigation among the files.
128 .PP
129 These programs share many options:
130 .TP
131 .B -e
132 Disable Floyd-Steinberg error diffusion, which is used to improve the appearance
133 of images on color-mapped displays, typically with 8 bits per pixel.
134 Primarily useful for debugging; if the display has true RGB color, the image
135 will be displayed in full glory.
136 .TP
137 .B -k
138 Convert and display the image as a black and white (really grey-scale) image.
139 .TP
140 .B -v
141 Convert the image to an RGBV color-mapped image, even if the
142 display has true RGB color.
143 .TP
144 .B -d
145 Suppress display of the image; this is set automatically by
146 any of the following options:
147 .TP
148 .B -c
149 Convert the image to a Plan 9 representation, as defined by
150 .MR image (7) ,
151 and write it to standard output.
152 .TP
153 .B -9
154 Like
155 .BR -c ,
156 but produce an uncompressed image.
157 This saves processing time, particularly when the output is
158 being piped to another program such as
159 .MR page (1) ,
160 since it avoids compression and decompression.
161 .TP
162 .B -t
163 Convert the image, if it is in color, to a true color RGB image.
164 .TP
165 .B -3
166 Like
167 .BR -t ,
168 but force the image to RGB even if it is originally grey-scale.
169 .PD
170 .PP
171 .I Jpg
172 has two extra options used to process the output of the LML
173 video card:
174 .TP
175 .B -f
176 Merge two adjacent images, which represent the two fields of a video picture,
177 into a single image.
178 .TP
179 .B -F
180 The input is a motion JPEG file, with multiple images representing frames of the movie. Sets
181 .BR -f .
182 .PD
183 .PP
184 The
185 .IR togif
186 and
187 .IR toppm
188 programs go the other way: they convert from Plan 9 images to GIF and PPM,
189 and have no display capability.
190 Both accept an option
191 .B -c
192 to set the comment field of the resulting file.
193 If there is only one input picture,
194 .I togif
195 converts the image to GIF format.
196 If there are many
197 .IR files ,
198 though, it will assemble them into an animated GIF file.
199 The options control this process:
200 .TP
201 .BI -l loopcount
202 By default, the animation will loop forever;
203 .I loopcount
204 specifies how many times to loop.
205 A value of zero means loop forever and a negative value means
206 to stop after playing the sequence once.
207 .TP
208 .BI -d msec
209 By default, the images are displayed as fast as they can be rendered.
210 This option specifies the time, in milliseconds, to pause while
211 displaying the next named
212 .IR file .
213 .PP
214 .I Gif
215 translates files that contain a `transparency' index by attaching
216 an alpha channel to the converted image.
217 .PP
218 .I Ico
219 displays a Windows icon (.ico) file. If no file is
220 specified,
221 .I ico
222 reads from standard input.
223 Icon files
224 contain sets of icons represeted by an image and a mask.
225 Clicking the right button pops up a menu that lets you
226 write any icon's image as a Plan 9 image (\fIwidth\fBx\fIheight\fB.image),
227 write any icon's mask as a Plan 9 image (\fIwidth\fBx\fIheight\fB.mask),
228 or exit. Selecting one of the write menu items yields a sight cursor.
229 Move the sight over the icon and right click again to write.
230 .PP
231 .I Toico
232 takes a list of Plan 9 image files (or standard input) and creates
233 a single icon file. The masks in the icon file will be the white
234 space in the image. The icon file is written to standard output.
235 .SH SOURCE
236 .B \*9/src/cmd/jpg
237 .SH "SEE ALSO"
238 .MR page (1) ,
239 .MR image (7) .
240 .SH BUGS
241 Writing an animated GIF using
242 .I togif
243 is a clumsy undertaking.