home *** CD-ROM | disk | FTP | other *** search
-
-
-
- VuePrint User's Guide
- Version 2.0
- Copyright (c) 1994 Edward B. Hamrick
- All Rights Reserved
-
-
- 1.0 Introduction
-
- VuePrint is a Windows 3.1 program that lets you display and print
- graphics files that use the GIF, JPEG, and BMP graphics formats.
- VuePrint supports all graphics displays and printers that operate with
- the MicroSoft Windows 3.1 operating environment, using a 386 or 486
- microprocessor.
-
- The two key features of VuePrint are speed and ease of use.
- VuePrint is more than twice as fast as most other JPEG viewers, and is
- able to scale images to full-screen more than five times as fast as
- other viewers. VuePrint will scale images to fill a window
- automatically, without distorting the image shape. While VuePrint has
- many features, and all are integrated in an easy to use menu system.
-
- Version 2.0 of VuePrint adds one key feature - the ability to
- display 24-bit per pixel JPEG files on 16-bit and 24-bit Windows
- displays. This means that JPEG files will look much more natural and
- smooth than under previous versions of VuePrint. JPEG files displayed
- on some 16-color displays may look much better as well.
-
- Most printers are only capable of displaying an array of black
- (or sometimes colored) dots. However, many graphics files contain
- images with up to 256 different colors. VuePrint uses a very fast
- error-dispersion algorithm (also called a dithering or half-toning
- algorithm) to print the image in the graphics file. This error
- dispersion algorithm takes advantage of the number of colors that a
- printer supports. If a display is unable to display 256 colors,
- VuePrint uses this same dithering algorithm to display an image.
-
- VuePrint also supports viewing GIF or JPEG images that can't
- completely fit into the available memory. It does this by storing a
- lower-resolution image in memory. This is useful when running
- multiple copies of VuePrint in different windows, doing slide shows in
- each window. Running multiple copies of VuePrint simultaneously works
- best on 16-bit and 24-bit displays, but it works acceptably on other
- types of displays.
-
- One of the design goals of VuePrint was to make it quick and
- inexpensive to download. The size of the file VUEPRI.ZIP is about
- 72,000 bytes, which can be downloaded in about 5 minutes at 2400 baud.
- This costs less than $1.00. Other programs with comparable
- functionality take up to four times as long to download. In order to
- keep the size of the file small, this User's Guide is deliberately
- brief and limited to explaining those features of VuePrint which can't
- be discovered by exploring the various menus.
-
- 2.0 Prerequisites
-
- In order to use VuePrint, you will need a personal computer that
- is running Microsoft Windows version 3.1 or higher. You will also
- need a 386 or 486 microprocessor. VuePrint will work with any Windows
- display, including Hercules, EGA, 16-color, 256-color, 16-bit color,
- and 24-bit color displays.
-
- VuePrint is distributed via CompuServe as shareware, and may be
- evaluated for 15 days. If you decide you want to register VuePrint,
- type "GO SWREG" and register program #1883.
-
- When you register VuePrint, you'll receive assistance via e-mail
- with any problems you may encounter. You'll also receive a Serial
- Number identifying your copy of VuePrint. This serial number is also
- valid for VueSav - a fast JPEG/GIF Screen Saver for Windows 3.1.
- VueSav can be obtained separately from CompuServe, America Online, and
- various Internet and BBS sites (VUESAV.ZIP).
-
- If you'd prefer to register VuePrint by mail, you can send the
- $40.00 registration fee to:
-
- Ed Hamrick
- 11588 Raintree Spring Ct.
- Cupertino, CA 95014
-
- 3.0 Installing and Running VuePrint
-
- To install VuePrint, put the file VUEPRINT.EXE in a directory
- that's convenient for you. Then use the Windows Program Manager's
- File->New menu item to install a new program item named VuePrint. To
- run VuePrint, just double-click on the VuePrint Icon.
-
- To get the highest quality image display, set up Windows to use
- the highest resolution display driver available. If you run Vueprint
- with a 16-color display driver, you'll get a hint that a 256-color or
- higher display driver will help. This message is only displayed for
- the two days after first running VuePrint. To get the highest quality
- JPEG displays, use a 16-bit or 24-bit display driver.
-
- All commands are accessible through the menu bar. Each command
- has a short-cut key which consists of a single keystroke. In addition
- to the short-cut keys documented in the menu bar, the arrow keys move
- the image when it is zoomed in. The arrow keys along with the shift-
- key move the image one full screen at a time.
-
- Pressing the left-hand mouse button causes the image to zoom in
- by a factor of two at the point the mouse was located. Pressing the
- right-hand mouse button allows you to move the image around when it is
- zoomed in. Double-clicking the right mouse button displays the entire
- image, undoing any previous zooming.
-
- Note that the menu items that increase and decrease the contrast
- are actually increasing and decreasing the "gamma" of the image. Gamma
- is a non-linear function that compensates for the fact that most
- monitors display non-linear intensities when presented with linear
- color lookup tables. The gamma adjustment that's used for the display
- is also used to change the contrast on the printout.
-
- The File->Info menu item allows you to lok at any comments that
- were included in the GIF or JPEG file that's currently being
- displayed. This screen also displays the width and height in pixels
- of the currently displayed image.
-
- One feature that's a little bit subtle is the ability to convert
- JPEG files to GIF files. If you check the JPEG Option "Write GIF",
- every time you view a JPEG file, a GIF file will be written at the
- same time. For instance, if you display XYZ.JPG, you'll find a file
- XYZ.GIF in the same directory. When VuePrint is started, the JPEG
- (and View) options are set to the values that should result in the
- highest quality display.
-
- 4.0 Bug Reports and Enhancement Requests
-
- If you have problems running VuePrint, or have an idea for
- enhancing VuePrint, please send e-mail to Ed Hamrick on CompuServe at
- 71470,3236. You can also send e-mail from the Internet to
- 71470.3236@compuserve.com.
-
- VuePrint doesn't yet read compressed BMP files or 24-bit BMP
- files. It only reads images that have a maximum size of 2048 by 2048,
- and can zoom images up to 6000 by 6000.
-
-
-
- TRADEMARKS
-
-
- GIF, Graphics Interchange Format, and CompuServe are trademarks of
- CompuServe, Inc., an H&R Block Company.
-
- Microsoft is a registered trademark and Windows is a trademark of
- Microsoft Corporation.
-
-
-
- ACKNOWLEDGEMENTS
-
-
- VuePrint is based in part on the work of the Independent JPEG Group.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-