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GROBSaver
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README
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ImageFX(tm) GROB Saver Module
Version 1.03
Written by Greg Simon
11/16/93
****************
** DISCLAIMER **
****************
The author does not and cannot take any responsibility for the use or
misuse of this program. Use it at your own risk. This program is
here-by placed into the public domain.
WHAT IS IT?
'GROB File' is a saver module for GVP's ImageFX Image Processing package.
It allows you to save an image in Hewlett Packard's GROB (GRaphical OBject)
format, suitable to be downloaded into any of Hewlett Packard's HP48-series
calculators. If you don't own an HP48(s,sx,g,gx) this program won't do
anything useful for you.
INSTALLATION
Assuming you already unpacked the archive :) copy the GROBFILE module to
your ImageFX modules savers directory:
> copy GROBFILE ImageFX:modules/savers
(Assuming that your system has the ImageFX 'assign' installed, most do.)
That's it! Next time you run ImageFX, you will see a new entry in the
Save (24bit) image requester called "GROB FIle".
WHAT IT DOES
The saver module is very simple, it looks at the colors of each pixel
element (red, green, and blue), and if they are all < 125, a pixel is
created (remember, the HP48 has an on/off LCD screen). Thus, if you load
your favorite 256-color .gif image and save it as a GROB, it will appear
very strange and dull on your HP48 screen.
The GROB saver module writes the GROB image out (in ASCII), and also writes
some code around the image to view it. Thus, you can simply save the
image, and go DIRECTLY to your terminal program and download the saved file
to the HP48 for viewing.
The HP48's screen size is 131 x 64 (yes, 131 pixels across), however this
is not a limit for the GROB saver program.
WHAT IS IT USED FOR?
I wrote this program in a hurry to store diagrams for some tests I have
next week :) (I really think you should be able to use your notes/book for
engineering "design" exams...but don't get me started :-| ...)
I've included a sample program which displays a converted logo of our
favorite computer, converted with ImageFX / GROB saver.
TIPS
DeluxePaint or Brilliance work very nicely to create the images (you can
cut a brush of 131x64 out and save it for loading into ImageFX);
Brilliance is especially nice for it's grid-pixel zoom mode.
FUTURE ENHANCEMENTS
When I have some time, I plan on adding gray-scale encoding, where the
program (saver module) writes out a series of grobs (function of the
number of bitplanes) and then plays them back in rapid order on the
calculator for a psuedo-gray-scale effect. This is not a new idea, but I'm
yet to see ANYTHING for Amiga users, or even IBM users (for creating
gray-scaled images, that is.)
I don't plan on writing an iff->GROB program which is stand-alone, since
I'd be going through ImageFX anyway. Besides, the author of ImageFX,
Thomas Krehbiel, was kind enough to provide Amiga USERS with a
development disk. (Thanks, Thomas!)
If I receive enough requests to write an iff2grob, I'll do it.
Send flames, comments, ideas, A4000's, to:
Greg Simon
2 Kingswoods Drive
New Hope, PA 18938 (215) 862-3339
Internet: grs124@psuvm.psu.edu
IRC: _Greg