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GR2GIF (tm)
GR2PCX (tm)
GR2PIC (tm)
*********
Graphics Conversion Utilities for use with
the GRABBER (tm) Screen Capture Program
DOCUMENTATION
May 10, 1991
Copyright 1991 by
Gerald A. Monroe
1241 Bunts Road
Lakewood, Ohio 44107 U.S.A.
CompuServe Mail ID # 72321,1257
YOUR LICENSE TO USE THIS SOFTWARE
----------------------------------
GR2GIF.COM, GR2PCX.COM, GR2PIC.COM and this documentation are
Copyright 1991 by Gerald A. Monroe. All rights are reserved
except those expressly granted here.
The programs GR2GIF, GR2PCX and GR2PIC, and this documentation file,
are distributed as an integral part of the GRABBER (tm) screen capture
package under the terms of a shareware license that is fully set forth
in the file GRABBER.DOC, which is the instruction manual for GRABBER
.COM, the main program module in the package.
The shareware license terms in the GRABBER.DOC file are incorporated
here by reference. This license permits you to copy and distribute
the files GR2GIF.COM, GR2PCX.COM, GR2PIC.COM and CONVERT.DOC (this
file) freely, provided that: these files are always distributed
together with each other and with the GRABBER.EXE and GRABBER.DOC
files; none of the files is modified in any way; and no fee, premium
or donation of any kind is charged or requested for their distribu-
tion except as permitted on the terms described in the GRABBER.DOC
file.
Continued use of the GR2GIF, GR2PCX or GR2PIC programs for more than
a 10-day trial period requires you to register your use of the soft-
ware with the author. For more information about the benefits of
registration and how to go about registering, please refer to the
full licensing and ordering information in the GRABBER.DOC file.
GR2GIF /GR2PCX /GR2PIC Documentation Page 2 of 7
WHAT ARE GR2GIF, GR2PCX and GR2PIC?
------------------------------------
GR2GIF, GR2PCX and GR2PIC are companion utilities to the GRABBER
screen capture program. You can use them to convert graphic images,
captured from your video display in the form of GRABBER "offspring"
files, into any of three widely recognized generic image formats
called GIF, PCX and PIC.
(If you are unfamiliar with how the GRABBER program works, or
what a GRABBER offspring file is, please consult the program
manual GRABBER.DOC before continuing.)
ABOUT THIS DOCUMENTATION
-------------------------
These three GRABBER companion utilities are described together in
this one document because each is operated identically to the others.
The only difference between these programs is in the structure of the
files they create.
For this reason, and for the sake of simplicity, the command examples
which are used in this document make use of the GR2GIF.COM program
exclusively. GR2GIF creates GIF files from GRABBER offspring files.
If you want to create a PCX file with GR2PCX, or a PIC file using
GR2PIC, then you can substitute the appropriate program name wherever
the examples below refer to GR2GIF.
Instructions for using these programs are detailed below, beginning
on page 5. Briefly, you tell GR2GIF/PCX/PIC the name of the GRABBER
offspring file you wish to convert, and (optionally) the name of the
file to which to save the GIF/PCX/PIC rendition of your original
offspring file. The program then goes to work, extracting the binary
screen image information from the offspring file, encoding it in the
appropriate format, and saving the results to the second file.
GR2GIF /GR2PCX /GR2PIC Documentation Page 3 of 7
THE "GIF" FILE FORMAT
----------------------
"GIF" is pronounced like "Jif," and it stands for "Graphic Interchange
Format."
The GIF image format was developed by CompuServe, Inc., as a
generalized method of exchanging and displaying graphic images on
the widest possible variety of computer graphics hardware. GIF is
probably the most widely accepted format for exchanging graphics
information among all makes and models of microcomputers, whether
IBM-compatible or not. If there is a "standard," then GIF is it.
One of the reasons for the popularity of the GIF format is its
very effective data compression method. Generally, there is no
other widely used file format which can compress a graphic image
into a smaller space than GIF can.
The GIF format is supported extensively on the CompuServe Information
Service and many other on-line BBS services that make graphic images
available for downloading. In addition to these on-line services,
however, there are several PC application programs which can employ
the GIF format. These include word processing, desktop publishing,
and "paint" programs, as well as numerous picture viewing utilities.
Therefore, you can use GR2GIF to convert almost any graphic image
captured by GRABBER into GIF format, so that the image can be imported
into any word processing, desktop publishing, or paint program which
"understands" the GIF format. If you want to find out whether a
particular application program you use can work with GIF files, and
therefore import the files created by GR2GIF, you should consult that
program's documentation or contact its publisher.
THE "PCX" FILE FORMAT
----------------------
The PCX image format was developed by Zsoft Corporation, which is the
publisher of the widely used graphics "paint" programs PC Paintbrush
and Publisher's Paintbrush. Both of these programs use the PCX format
for storing and retrieving graphic images to and from disk files.
However, many other PC applications which involve graphic data, in
addition to the two Zsoft products mentioned, also employ the PCX
format. These include other paint programs, word processors such as
WordPerfect Version 5.0 and above, desktop publishing programs, and
picture viewing utilities. The PCX format uses a data compression
scheme to reduce the disk space required to store graphic images.
You can use GR2PCX to convert almost any graphic image captured by
GRABBER into PCX format, so that the image can be imported into any
word processing, desktop publishing, or paint program which "under-
stands" the PCX format. If you want to find out whether a particular
application program you use can work with PCX files, and therefore
import the files created by GR2PCX, you should consult that program's
documentation or contact its publisher.
GR2GIF /GR2PCX /GR2PIC Documentation Page 4 of 7
THE "PIC" FILE FORMAT
----------------------
The PIC image format resembles the PCX format in its origins as a
method of storing "paint" program images. The PIC format is employed
by such programs as EGA Paint, PC Paint and PC Paint Plus, and the
PICTOR and GRASP programs, as well as other paint programs. Like GIF
and PCX, the PIC format uses a unique data compression scheme to save
disk space. You can use GR2PIC to convert almost any graphic image
captured by GRABBER into the PIC format, so that the image can be
imported into any word processing, desktop publishing, or paint
program which "understands" the PIC format. If you want to find out
whether a particular application program you use can work with PIC
files, you should consult that program's documentation or contact its
publisher.
WHAT GR2GIF/PCX/PIC CAN CONVERT
--------------------------------
These programs are able to convert almost any GRABBER offspring file
containing a graphic image into a separate GIF, PCX or PIC file.
This includes any image originally captured in any CGA mode, any EGA
mode, any VGA mode, and the Hercules monochrome graphics mode.
These programs cannot be used to convert text-mode images to GIF,
PCX or PIC files.
On page 4 of the GRABBER program documentation, there is a list of
the various video modes which GRABBER supports. If a video mode
in that chart indicates "n/a" in the column which is headed "Graphics
Resolution," then that is a text mode, and GRABBER offspring files
captured in that mode cannot be converted to GIF, PCX or PIC. The
other modes shown there can be converted.
Note for the technical-oriented user: If you have a Super-VGA (SVGA)
adapter, you should read page 5 of the GRABBER program documenta-
tion. Generally, any 16-color or 256-color SVGA image can be con-
verted to the GIF, PCX and PIC formats using these programs if the
SVGA manufacturer has modeled the memory organization of its video
modes after the IBM EGA "four-plane planar" method (for 16-color
screens), or IBM VGA "packed pixel" method (for 256-color screens).
SVGA memory organization schemes which are unique to certain adapters
are generally not supported by these conversion programs. An example
of such a mode is the one numbered 67h for 1,024 x 768 16-color
images on the ATI VGA Wonder adapter.
GR2GIF /GR2PCX /GR2PIC Documentation Page 5 of 7
USING GR2GIF/PCX/PIC : INTERACTIVE MODE
----------------------------------------
First, choose a GRABBER offspring image you want to convert. The
offspring file must contain a graphic image.
From the DOS prompt (or in a batch file), enter the command GR2GIF
and press <RETURN>. The program asks you to specify the name of the
offspring file you wish to convert (the "input file"). You may
optionally precede the filename with a drive and/or pathname if
necessary.
(Note: All GRABBER offspring files should have the file extension
".EXE", and these conversion programs assume that your input file
ends in ".EXE". You may omit this extension when entering the
file name. For example, entering "SCREENXX" is the same as enter-
ing "SCREENXX.EXE".)
Next, the program asks for the name of the file you wish to create
from the offspring image (the "output file"). If you wish to give
your output file the same name as your input file but with a ".gif"
(or ".pcx" or ".pic") extension, just press <RETURN>. If you wish
to give it a different name than the default which the program shows
you, or place it in a different drive or directory than your input
file, you must enter the full file specification, including drive,
path, and ".gif" extension.
(NOTE: Do not give the output file an ".EXE" or ".COM" extension.
GIF, PCX and PIC files are not executable programs like the original
offspring file, and attempting to execute them like one will certainly
"crash" your computer.)
Finally, the program asks if you want to "resize" the image. If you
respond by pressing <N> or <RETURN>, then the program will convert the
entire image to GIF, PCX or PIC format. The resulting file will in-
clude image data for the entire screen as it appears on your display
when you execute the .EXE offspring file.
If you don't want to convert the entire image to GIF, PCX or PIC
format, but wish to convert only a portion of it, then you should
respond to the "resize" prompt by pressing <Y>. GR2GIF will display
the offspring image on your screen along with a highlighted "select
box," which you use to tell the program which rectangular portion of
the image to save to GIF, PCX or PIC format. Instructions for moving
the select box around the screen, and changing its size or shape, can
be found below on page 6.
After you respond to the "resize" prompt by pressing <N> or <RETURN>,
or finish resizing the image (if you pressed <Y>), the program goes
to work, creating your output file from the original offspring. This
usually takes only a few seconds. When the program is finished
creating your output file, it displays a message to this effect. This
newly created GIF, PCX or PIC file is now ready for you to use.
GR2GIF /GR2PCX /GR2PIC Documentation Page 6 of 7
USING THE RESIZE FEATURE: CONTROLLING THE SELECT BOX
------------------------------------------------------
The following keys are available to you when using the resize feature
feature within GR2GIF, GR2PCX and GR2PIC:
<Esc> . . . . . . . . . . . . Abort the conversion process and exit.
<Return> . . . . . . . . . . Accept the area enclosed by the select
box, and begin converting.
<Left Arrow>
<Right Arrow> Move the select box in the indicated
<Up Arrow> direction without changing the shape
<Down Arrow> . . . . . . . . of the box.
<Shift><Left Arrow> . . . . . Shrink the box horizontally.
<Shift><Right Arrow> . . . . Expand the box horizontally.
<Shift><Up Arrow> . . . . . . Shrink the box vertically.
<Shift><Down Arrow> . . . . . Expand the box vertically.
<Insert> . . . . . . . . . . Toggle between coarse and fine incre-
ments for moving or reshaping the box.
<Home> . . . . . . . . . . . Move the box to the upper left-hand
corner of the screen.
<End> . . . . . . . . . . . . Move the box to the lower left-hand
corner of the screen.
<Ctrl><PgUp> . . . . . . . . Move the box to the upper right-hand
corner of the screen.
<Ctrl><PgDn> . . . . . . . . Move the box to the lower right-hand
corner of the screen.
<PgUp> . . . . . . . . . . . Move box to top edge of the screen.
<PgDn> . . . . . . . . . . . Move box to bottom edge of the screen.
<Ctrl><Left Arrow> . . . . . Move box to left edge of the screen.
<Ctrl><Right Arrow> . . . . . Move box to right edge of the screen.
GR2GIF /GR2PCX /GR2PIC Documentation Page 7 of 7
USING GR2GIF/PCX/PIC : COMMAND LINE MODE
------------------------------------------
You can also run the conversion programs by placing both the input
(offspring) and output (GIF, PCX or PIC) filenames on the DOS command
line after the program name itself. Use this example:
GR2GIF [d:][\path\]SCREENXX[.EXE] [d:][\path\][SCREENXX.GIF] [/S]
The parameters shown within [brackets] are optional.
To use the resize option (described above) in command-line mode,
include the /S switch on the GR2GIF command line. If you omit
the /S switch, the entire image will be converted to GIF format.
The first [d:] stands for the disk drive where your offspring
program file is located, and the first [\path\] stands for the
directory in which it resides. In the above example, SCREENXX.EXE
is the name of the GRABBER offspring file containing the image you
want to convert. As above, ".EXE" extensions may be omitted.
The second [d:] and [\path\] stand for the drive and directory in
which to place your converted output file. If you omit the output
filename, the program will supply a default for you, and create your
GIF/PCX/PIC file on the same drive and directory as your input file,
giving it the same name as the input file but with a ".gif" (or ".pcx"
or ".pic") extension in place of the ".EXE".
Another example. Entering:
GR2GIF C:\PICTURES\SCREEN00 /S
has the same effect as entering:
GR2GIF C:\PICTURES\SCREEN00.EXE C:\PICTURES\SCREEN00.GIF /S
** End of CONVERT.DOC **