Contents of the SNAPSHOT.DOC file
Richard Q. Fox
Version 1.1 - 3/88
SNAPSHOT is a Shareware program that displays any GIF graphic
file in EGA format. All pictures captured by GIF and displayed
through SNAPSHOT will automatically have the correct height to
width ratio and will appear in true perspective. The entire
picture is in view at one time. Furthermore, SNAPSHOT emulates
256 colors from a palette of 3060 colors to closely match the
TABLE OF CONTENTS
5. EVA 480 GRAPHICS
SNAPSHOT for the IBM PC is Copyright 1988 (c) by Richard Q. Fox.
All Rights Reserved. User Supported Software. For a non-
commercial license, send $20.00 to:
Richard Q. Fox
1364 Campbell St.
Orlando, FL 32806
CompuServe ID: 72356,242
GIF and 'Graphics Interchange Format' are trademarks (tm) of
CompuServe Incorporated, an H&R Block Company. Portions of this
program Copyright 1986, 1987 New Dimension Software.
SNAPSHOT is user supported software. SNAPSHOT for the IBM PC is
made available for a free ten day trial period. If you find this
program useful, you may license the program for non-commercial
use on one machine by sending $20.00 to:
Richard Q. Fox
1364 Campbell St.
Orlando, FL 32806
SNAPSHOT may be licensed for commercial use on up to 10
computers at a single site or set of contiguous sites for
$100.00. A commercial site is defined as a business or
individual seeking to make a profit by selling SNAPSHOT or
incorporating this program in another program.
Clubs, schools, universities and other organizations may license
SNAPSHOT for $50.00 per 6 copies.
All other rights are reserved.
SNAPSHOT may not be changed or modified in any way except by the
author. SNAPSHOT may be freely distributed for the ten day trial
period as long as it remains in its complete form. Regardless of
how the copy is obtained, it is requested that all users comply
with the licensing agreement.
All licensing registrations will be promptly acknowledged. All
licensees will receive prompt notification of product revisions
and will be able to purchase updates at a nominal fee.
All warranties are disclaimed, including damage to hardware
and/or software from use of this product.
SNAPSHOT has four main capabilities. One, SNAPSHOT automatically
displays a GIF picture in EGA format on an IBM PC or clone. Many
pictures captured by GIF were originally in MAC, Atari, or some
other format and previously required scrolling to view them on
the IBM. SNAPSHOT compresses or expands the picture while
retaining true proportions, allowing the user to view the entire
picture at once.
Two, SNAPSHOT emulates the color pattern of the original picture.
EGA cards allow for 16 colors on the screen at one time. This
can cause a loss of detail when the original picture contains
more than 16 colors. Nuances of shade are gone as the computer
selects solid colors closest to the original hue. This can be
most unsatisfactory with skin tones.
SNAPSHOT displays each pixel of color as four pixels. This
allows 256 colors from a palette of 3060 to be on the screen at
one time. All the color and shade nuances of the original become
visible. The picture is viewed as the artist intended.
SNAPSHOT's third important feature allows the user to alter the
colors in the picture without having to move to another graphics
program. By moving a blinking cursor over the color to be
changed, the user can modify the colors on screen. The picture
can then be saved to disk or printed or both.
Finally, SNAPSHOT can make a hard copy printout of any GIF file
on the Okimate 20 printer. The printout has the correct aspect
ratio, is in 64 colors, and is 8" x 10" in landscape format.
SNAPSHOT is a straight forward, menu driven program that is easy
to use. When first accessed, SNAPSHOT places a blue menu on
screen with the selected command highlighted in red. The
Load a Picture
Save a Picture
Commands are accessed by using the up and down arrows. When the
desired command is highlighted in red, press carriage return to
access that command. Alternately, the first letter of each
command may be pressed, or the space bar may be pressed.
The Introduction gives a brief synopsis of the program and how to
The Directory is the route to take if the user wants to load a
picture but isn't sure of the name, doesn't know what disk it is
on, or can't remember the spelling.
The Directory function prompts the user for the disk path. If
the source is the current path, pressing return will list the
contents of that directory. Typing the disk drive and
subdirectory followed by a carriage return will also bring in the
contents of the disk.
Loading pictures via the Directory allows the user to search
several disks to locate the picture without having to first find
the picture, then load SNAPSHOT, then load the picture. This
time-saving feature permits the handling of many pictures at one
sitting and eliminates the need to search for pictures before
using the program.
The Directory sorts up to 240 GIF file names alphabetically. The
window shows 60 file names. Use the cursor arrow keys to scroll
through the full list of up to 240 file names. Even better, press
the FIRST LETTER of the file name, to jump the cursor to the
area of the window that contains files starting with that letter.
Press ENTER to display the picture, or press ESCAPE to return to
the Main Menu. The ESCAPE key may also be used to abort back to
the Main Menu while the picture is loading.
The Load command allows direct loading of pictures from any
drive. The load command first prompts for the path, followed by
a carriage return. The user is then prompted for the file name
and the file extender. If no file extender is entered, an exten-
der of GIF is assumed. Many users are adding their own personal
extenders to GIF files to facilitate sorting. Extenders such as
.spc (for space) for example are recognized by the Load command
of SNAPSHOT as long as the file is in GIF format. While the pic-
ture is loading, the ESCAPE key may be pressed to abort back to
the Main Menu.
The Save commands operates the same as the Load command. The
user is asked to specify the path, the drive, the file name and
the extender. If the specified name already exists, pressing
carriage return will save the file.
WARNING: WHEN SAVING A PICTURE WITH SNAPSHOT, IT IS BEST TO SAVE
THE FILE UNDER A NEW NAME TO AVOID OVERWRITING THE ORIGINAL GIF
FILE. ALL FILES WRITTEN BY SNAPSHOT ARE 640x350 by 16 COLORS,
OR 640x480 by 16 REGARDLESS OF THE FORMAT OF THE ORIGINAL FILE.
Change Color is one of the most useful features of Snapshot.
When this command is accessed, the user may change the colors of
the picture to add his own creativity. To change a color, move
the blinking cursor over the color to be changed using the
arrows. Press carriage return. Use the arrows to select the
color. The up and down arrows change the shade through the 16
colors of EGA. The right and left arrows step the chosen color
through four intensities. Once the color is chosen, pressing
carriage return locks in the color.
The user may choose any 16 of 64 shades and intensities to obtain
a desired effect. Once the picture is to the user's
satisfaction, pressing ESC returns SNAPSHOT to the main menu.
At this point, the new picture can be saved. The picture may be
altered and saved as many times as the user wishes. Simply save
the altered picture under a new name to avoid destroying the
The Function keys can also be used to change colors. These keys
modify the overall tint of dithered color pictures.
F1 Help key
F2 Restore the original colors
F3 Hotter palette
F4 Colder palette
F5 Yellow tint
F6 Red tint
F7 Green tint
F8 Blue tint
F9 Keep present palette
F10 Recall previously "kept" palette
As an example, the following steps might be used to improve the
appearance of a picture of a man with gray flesh tones. First,
try F3 Hotter Palette. It is too hot for this picture. The man
looks like he has high blood pressure. Next, try F4 Yellow Tint
instead of F3. This tint is an improvement, but it needs some
changes. Use the cursor arrows to select a specific color dot,
and modify that color. Use F9 to capture that color set up. Use
the cursor arrows to change another color. Decide that the
earlier set up was better. Use F10 to recall the earlier set
up. Press Escape to go to the main menu, and Save the picture
with its modified colors.
The Print command prints the picture on an Okimate 20. The
printed picture is 8" x 10" and is in landscape format. The best
paper for printing has a waxed, high gloss surface and can be
obtained through office supply stores at about 10 cents a sheet.
This paper gives dense, overlapping color saturation without
streaks and gaps.
EXIT allows the user to leave SNAPSHOT.
COMMAND LINE ENTRY
Snapshot may be initiated with a command line which passes the
name of the file to display as an argument. Drive names and path
names may be included in the argument. A file extender of .GIF is
assumed, if no extender is present.
SNAPSHOT is written for the Okimate 20. SNAPSHOT uses enhanced
programming which gives Okimate 20 prints crisp, solid color and
emulates the screen colors as closely as possible.
EVA 480 GRAPHICS
SNAPSHOT inspects the EGA graphics card to determine if it is a
Tseng EVA /480 or a NEC GB-1 640 x 480 graphics card. If either
card is detected, the program automatically switches to 640 x 480
graphics mode. A confirming message appears on the main menu when
the program is first started, if the switch is made. The 640 x
480 mode may be over ridden when SNAPSHOT is started, by includ-
ing the -t flag in the command line. This flag forces 640 x 350
SNAPSHOT -t a:car