jp2a(1) 							   USER COMMANDS							   jp2a(1)

NAME

       jp2a - convert JPEG images to ASCII

SYNOPSIS

       jp2a [ options ] [ filename(s) | URL(s) ]

DESCRIPTION

       jp2a will convert JPEG images to ASCII characters.  You can specify a mixture of files and URLs.

OPTIONS

       -      Read JPEG image from standard input

       --background=light --background=dark
	      If you don't want to mess with --invert all the time, just use these instead.  If you are using white characters on a black display,
	      then use --background=dark, and vice versa.

       -b --border
	      Frame output image in a border

       --chars=...
	      Use the given characters when producing the output ASCII image.  Default is "   ...',;:clodxkO0KXNWM".

       --colors
	      Use ANSI color for text output and CSS color for HTML output.

       -d --debug
	      Print debugging information when using libcurl to download images from the net.

       -f --term-fit
	      Use the largest dimension that makes the image fit in your terminal display.

       --term-height
	      Use terminal display height and calculate width based on image aspect ratio.

       --term-width
	      Use terminal display width and calculate height based on image aspect ratio.

       -z --term-zoom
	      Use terminal display width and height.

       --fill When used with --html and --color, then color each output character's background color.  For instance, if you want to use  fill-out-
	      put on a light background, do

	      jp2a --color --html --html-fill --background=light somefile.jpg --output=dark.html

	      To do the same on a light background:

	      jp2a --color --html --html-fill --background=dark somefile.jpg --output=light.html

	      The default is to have fill disabled.

       -x --flipx
	      Flip output image horizontally

       -y --flipy
	      Flip output image vertically

       --height=N
	      Set output height.  If only --height is specified, then output width will be calculated according to the source images aspect ratio.

       -h --help
	      Display a short help text

       --grayscale
	      Converts image to grayscale when using --html or --colors.

       --html Make  ASCII  output in strict XHTML 1.0, suitable for viewing with web browsers.	This is useful with big output dimensions, and you
	      want to check the result with a browser with small font.

       --html-fill
	      Same as --fill.  You should use that option instead.

       --html-no-bold
	      Do not use bold text for HTML output.

       --html-raw
	      Output only the image in HTML codes, leaving out the rest of the webpage, so you can construct your own.

       --html-fontsize=N
	      Set fontsize when using --html output.  Default is 4.

       --html-title=...
	      Set HTML output title.

       --output=...
	      Write ASCII output to given filename.  To explicitly specify standard output, use --output=-.

       -i --invert
	      Invert output image.  If you view a picture with white background, but you are using a display with light characters on a dark back-
	      ground, you shoudl invert the image.

       --red=...

       --green=...

       --blue=...
	      When  converting from RGB to grayscale, use the given weights to calculate luminance.  These three floating point values must add up
	      to exactly 1.0.  The default is red=0.2989, green=0.5866 and blue=0.1145.

       --size=WIDTHxHEIGHT
	      Set output dimension.

       -v --verbose
	      Print some verbose information to standard error when reading each JPEG image.

       --width=N
	      Set output width.  If you only specify the width, the height will be calculated automatically.

       -V --version
	      Print program version.

       --zoom Sets output dimensions to your entire terminal window, disregarding source image aspect ratio.

RETURN VALUES

       jp2a returns 1 when errors are encountered, zero for no errors.

EXAMPLES

       Convert and print imagefile.jpg using ASCII characters in 40 columns and 20 rows:

       jp2a --size=40x20 imagefile.jpg

       Download an image off the net, convert and print:

       jp2a http://www.google.com/intl/en/logos/easter_logo.jpg

       Output picture.jpg and picture2.jpg, each 80x25 characters, using the characters " ...ooxx@@" for output:

       jp2a --size=80x25 --chars=" ...ooxx@@" picture.jpg picture2.jpg

       Output image.jpg using 76 columns, height is automatically calculated from aspect ratio of image.jpg

       cat image.jpg | jp2a --width=76 -

       If you use jp2a together with ImageMagick's convert(1) then you can make good use of pipes, and have ImageMagick do all sorts of image con-
       versions and effects on the source image.  For example:

       convert somefile.png jpg:- | jp2a - --width=80

       Check  out convert(1) options to see what you can do.  Convert can handle almost any image format, so with this combination you can convert
       images in e.g. PDF or AVI files to ASCII.

       Although the default build of jp2a includes automatic downloading of files specified by URLs, you can explicitly  download  them  by  using
       curl(1) or wget(1), for example:

       curl -s http://foo.bar/image.jpg | convert - jpg:- | jp2a -

DOWNLOADING IMAGES FROM THE NET

       If you have compiled jp2a with libcurl(3), you can download images by specifying URLs:

       jp2a https://user:pass@foo.com/bar.jpg

       The protocols recognized are ftp, ftps, file, http, https and tftp.

       If you need more control of the downloading, you should use curl(1) or wget(1) and jp2a read the image from standard input.

       jp2a  uses  pipe  and fork to download images using libcurl (i.e., no exec or system calls) and therefore does not worry about malevolently
       formatted URLs.

GRAYSCALE CONVERSION

       You can extract the red channel by doing this:

       jp2a somefile.jpg --red=1.0 --green=0.0 --blue=0.0

       This will calculate luminance based on Y = R*1.0 + G*0.0 + B*0.0.  The default values is to use Y = R*0.2989 + G*0.5866 + B*0.1145.

PROJECT HOMEPAGE

       The latest version of jp2a and news is always available from http://jp2a.sourceforge.net

SEE ALSO

       cjpeg(1), djpeg(1), jpegtran(1), convert(1)

BUGS

       jp2a does not interpolate when resizing.  If you want better quality, try using convert(1) and convert the source image to the exact output
       dimensions before using jp2a.

       Another issue is that jp2a skips some X-pixels along each scanline.  This gives a less precise output image, and will probably be corrected
       in future versions.

AUTHOR

       Christian Stigen Larsen <csl@sublevel3.org> -- http://csl.sublevel3.org

       jp2a uses jpeglib to read JPEG files.  jpeglib is made by The Independent JPEG Group (IJG), who have a page at http://www.ijg.org

LICENSE

       jp2a is distributed under the GNU General Public License v2.

version 1.0							 September 4, 2006							   jp2a(1)