jslice - Command line based JPEG slicing program
------------------------------------------------
=========
Purpose -
jslice is designed to read in a JPEG file, and then allow you
[the user] to select portions of it to be saved [also] as JPEG
files.
==============
Why do that? -
If you've ever tried to make a WWW page out of a full-size
JPEG splash-screen,complete with javascript buttons, then
you'll understand that slicing your splash-screen into little
bits can prove to be quite a nightmare. Worse still, is no
sooner do you get that splash screen out, than the person
who wants it says "Ermm... can we add something?"
===============================
Oh, okay, so how do I use it? -
Lets set the scene, you have a splash screen JPEG file called
frontpage.jpg
You wish to make lots of slices, named like
fp001.jpg
fp002.jpg
...
fp013.jpg
You also want the output quality of the JPEG to be 80%.
First off, you need to work out the coordinates of the slices
you wish to take out of your main JPEG file. Specifically, the
opposing corners of your rectangular "slice". ie, here are the
coordinates of slices that I wanted to take out of one of
my splash screens
NOTE - Comments are denoted by the 1st char of each line being
a '#'
# Start of the file...
#
# some arb comments
#
0 0 120 24 reservations.html
120 0 200 24 location.html
200 0 270 24 rates.html
270 0 360 24 facilities.html
360 0 460 24 conference.html
460 0 570 24 restaurant.html
570 0 640 24 gallery.html
640 0 704 24 /
#
# This is just a spacer
#
0 25 600 45
600 25 704 45 mailto:contact@somearbplace.com
#
# More spacers
#
0 46 704 389
#
#----end of the file
The format of each line is x1 y1 x2 y2 <URL>
Each line represents ONE slice.
You'll also note that the slices are ordered left->right, top->bottom.
Place these coordinates into a text file, say frontpage.cut
(use vi or your other favorite form of torture).
Then, finally, to put it all together, you run jslice in the
following way...
jslice frontpage.jpg fp frontpage.cut 80
jslice will dump the HTML to stdout, so u can redirect it to what ever
file name you wish, ie...
jslice frontpage.jpg fp frontpage.cut 80 > frontpage.html
where ...
frontpage.jpg is the source picture
fp is the destination file[s] prefix
frontpage.cut is the text file containing the slice coordinates
80 is the quality of the output JPEG's.
So, that's it... nothing else. Enjoy.
You can post your compliments to jack@spyda.co.za,
and your complaints to /dev/null ;)
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