man jp2a Command

Man page for apt-get jp2a Command

Man Page for jp2a in Linux

This tutorial shows the man page for man jp2a in linux.

Open terminal with 'su' access and type the command as shown below:
man jp2a

Result of the Command Execution shown below:

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   back Äê
              ground=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 output on a light back Äê
              ground, 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 background, 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  conversions  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  ver Äê
       sions.

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)-

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