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JPG(1)			    General Commands Manual			JPG(1)

NAME
       jpg,  gif,  png,	 ppm, bmp, yuv,	ico, togif, toppm, topng, toico	- view
       and convert pictures

SYNOPSIS
       jpg [ -39cdefFkJrtv ] [ file ...	 ]
       gif [ -39cdektv ] [ file	...  ]
       png [ -39cdektv ] [ file	...  ]
       ppm [ -39cdektv ] [ file	...  ]
       bmp [ file ]
       yuv [ file ]

       togif [ -c comment ] [ -l loopcount ] [ -d msec ] [ -t transindex  ]  [
       file ...	 [ -d msec ] file ...  ]
       toppm [ -c comment ] [ file ]
       topng [ -c comment ] [ [	-g gamma ] [ file ]

       ico [ file ]
       toico [ file ...	 ]

DESCRIPTION
       These  programs read, display, and write	image files in public formats.
       Jpg, gif, png, ppm, bmp,	and yuv.  read files in	the corresponding for-
       mats and, by default, display them in the current window; options cause
       them instead to convert the images to Plan 9  image  format  and	 write
       them  to	 standard  output.  Togif, Toppm, and topng read Plan 9	images
       files, convert them to GIF, PPM,	or PNG,	and  write  them  to  standard
       output.

       The  default  behavior  of jpg, gif, and	ppm is to display the file, or
       standard	input if no file is named.  Once a file	is displayed, typing a
       character  causes  the  program to display the next image.  Typing a q,
       DEL, or control-D exits the program.  For a more	 user-friendly	inter-
       face,  use  which invokes these programs	to convert the images to stan-
       dard format, displays them, and offers scrolling,  panning,  and	 menu-
       driven navigation among the files.

       These programs share many options:

       -e     Disable  Floyd-Steinberg	error  diffusion, which	is used	to im-
	      prove the	appearance of images on	color-mapped  displays,	 typi-
	      cally with 8 bits	per pixel.  Primarily useful for debugging; if
	      the display has true RGB color, the image	will be	 displayed  in
	      full glory.

       -k     Convert and display the image as a black and white (really grey-
	      scale) image.

       -v     Convert the image	to an RGBV color-mapped	 image,	 even  if  the
	      display has true RGB color.

       -d     Suppress	display	of the image; this is set automatically	by any
	      of the following options:

       -c     Convert the image	to a Plan 9 representation, as defined by  and
	      write it to standard output.

       -9     Like -c, but produce an uncompressed image.  This	saves process-
	      ing time,	particularly when the output is	being piped to another
	      program such as since it avoids compression and decompression.

       -t     Convert the image, if it is in color, to a true color RGB	image.

       -3     Like  -t,	 but  force  the image to RGB even if it is originally
	      grey-scale.

       Jpg has two extra options used to process the output of the  LML	 video
       card:

       -f     Merge  two  adjacent images, which represent the two fields of a
	      video picture, into a single image.

       -F     The input	is a motion JPEG file, with multiple images represent-
	      ing frames of the	movie.	Sets -f.

       The togif and toppm programs go the other way: they convert from	Plan 9
       images to GIF and PPM, and have no display capability.  Both accept  an
       option  -c to set the comment field of the resulting file.  If there is
       only one	input picture, togif converts the image	 to  GIF  format.   If
       there  are  many	 files,	though,	it will	assemble them into an animated
       GIF file.  The options control this process:

       -lloopcount
	      By default, the animation	will loop forever; loopcount specifies
	      how  many	times to loop.	A value	of zero	means loop forever and
	      a	negative value means to	stop after playing the sequence	once.

       -dmsec By default, the images are displayed as fast as they can be ren-
	      dered.   This  option  specifies	the  time, in milliseconds, to
	      pause while displaying the next named file.

       Gif translates files that contain a `transparency' index	 by  attaching
       an alpha	channel	to the converted image.

       Ico  displays a Windows icon (.ico) file.  If no	file is	specified, ico
       reads from standard input.  Icon	files contain sets of icons represeted
       by  an image and	a mask.	 Clicking the right button pops	up a menu that
       lets you	write any icon's image as a Plan 9 image (widthxheight.image),
       write  any  icon's mask as a Plan 9 image (widthxheight.mask), or exit.
       Selecting one of	the write menu items yields a sight cursor.  Move  the
       sight over the icon and right click again to write.

       Toico  takes  a list of Plan 9 image files (or standard input) and cre-
       ates a single icon file.	 The masks in the icon file will be the	 white
       space in	the image.  The	icon file is written to	standard output.

SOURCE
       /src/cmd/jpg

SEE ALSO
BUGS
       Writing an animated GIF using togif is a	clumsy undertaking.

									JPG(1)

NAME | SYNOPSIS | DESCRIPTION | SOURCE | SEE ALSO | BUGS

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