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IMAGE.TXT
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1992-03-03
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Aldus Corporation
PageMaker 4.0 for Windows
Drivers/Filters Pack #4
March, 3 1992
IMAGES.TXT
1. INTRODUCTION
This disk set contains an updated Image Library (ALDIM.PCL) for PC PageMaker
4.0 and Persuasion 2.0. Please refer to the sections below to determine if
you should install this alternative Image Library. After installation the
file ALDIM.PCL will be renamed to ALDIM.DLL: ALDIM.PCL is referred to as
ALDIM.DLL in the sections below.
The Image Library file is responsible for the importing, displaying and
printing of bitmapped images such as TIFF, BMP and PCX files
in PageMaker and Persuasion. This updated file, ALDIM.DLL, adds new
support for a variety of video drivers and file formats and corrects a
number of problems found in previous Image Libraries.
By using shared components all Aldus products can benefit from adding or
upgrading individual files. Dictionaries, filters and code libraries (DLLs)
can be shared by Aldus PageMaker, Aldus Persuasion and Aldus FreeHand. This
saves on hard disk space, improves performance and allows new technology to
be readily incorporated into all our products. By updating your system to
use this new code library, ALDIM.DLL, both PageMaker and Persuasion will be
enhanced.
2. NEW IN THIS IMAGE LIBRARY
BETTER TIFF PRINTING TO PCL5 PRINTERS: Unlike previous versions, this DLL
does not convert grayscale TIFF images into Black & White halftones when
printing to PCL printers. This allows the PCL printer driver to do the
grayscale-to-halftone conversion itself. When printing to a LaserJet III
(or other PCL5 printers) TIFF images will generally print at a higher
quality and produce more levels of gray. Printing to non-PCL printers
(PostScript, dot matrix, etc.) has not been affected by this change. See
note below under "Drawbacks" for information on PCL4 printers.
USING IMAGE CONTROL ON 1-BIT IMAGES: Previously, Aldus PageMaker 4.0 users
could experience an Unrecoverable Application Error (UAE) if they used
Image Control to alter a black and white (1-bit) image. This only occurred
when using the ALDIM.DLL that shipped with Aldus Persuasion 2.0. This has
been corrected through this DLL and the DLL that was released with
Persuasion 2.1.
CMYK TIFF SUPPORT: This new Image Library now supports pre-separated CMYK
TIFF images. You can import, display and print composites of these CMYK
TIFF files.
SUPPORT FOR MULTIPLE PLANE VIDEO DRIVERS: This Image Library adds better
support for video drivers that use multiple planes to define their own
screen colors (e.g., 8 planes by 1 bit vs. 1 plane by 8 bits). This
improves support for some 256 color drivers such as the Compaq AG1024 video
driver and some video drivers by NEC.
SUPPORT FOR OTHER VIDEO DRIVERS: Better support was added for display
drivers using less than 8 bits per plane to define their on screen colors
(e.g., 1 plane by 4 bits) including some LaserMaster video drivers.
IMPROVED RGB IMAGE PRINTING: This DLL improves the quality of color RGB
images printed to black and white PostScript printers.
3. DRAWBACKS TO USING THIS IMAGE LIBRARY
PRINTING TO PCL4 PRINTERS: Previously, ALDIM.DLL converted grayscale image
data to halftone data when printing to PCL4 and PCL5 printers. The current
PCL5 printer driver from Hewlett-Packard now supports its own grayscale-to-
halftone algorithms and is proficient at converting and printing gray-scale-to-hafltone
images. To allow for improved PCL5 printing, ALDIM.DLL was changed to let
grayscale data pass through unchanged to ALL PCL printers. While this
alternate image library solves a problem with PCL5 printers, it may create a
problem with PCL4 printers: the current PCL4 printer driver does not convert
grayscale data to halftones, therefore, the quality of grayscale TIFF images
may decrease slightly if you install this alternate ALDIM.DLL and print to
a PCL4 printer. If this occurs you may wish to reinstall the ALDIM.DLL that
came with your original PageMaker 4.0 or Persuasion 2.0 disks.
SCREEN FREQUENCY, PATTERN AND ANGLE: Because the new ALDIM.DLL does not
convert grayscale images to a halftone before sending it to a PCL printer,
changes made to the screen frequency, screen pattern and screen angle of an
image in PageMaker's Image Control dialog box will not be applied when the
image is printed. Postscript and dot matrix printers are not affected.
Changes to brightness and contrast settings will function normally to all
printers.
4. COMPATIBILITY WITH OTHER ALDUS PRODUCTS
PERSUASION 2.0: The initial version of Aldus Persuasion has not been
tested with this new ALDIM.DLL. If you are using PageMaker 4.0 and
Persuasion 2.0 on the same computer and wish to use this new DLL we
recommend that you upgrade to Persuasion 2.1.
PERSUASION 2.1: The ALDIM.DLL that is shipping with Aldus Persuasion 2.1
is identical to the ALDIM.DLL found on this disk set except for one change.
The DLL on this disk set does not convert grayscale data into a halftone
when printing to PCL printers [see section 1 of this text file]. If you
are using PageMaker 4.0 and Persuasion 2.1 on the same computer you may use
either the DLL that is found on this disk (best for PCL5 users) or the DLL
that came with Persuasion 2.1 (best for users of all other printers).
FREEHAND & PHOTOSTYLER: Currently Aldus FreeHand and Aldus PhotoStyler use
their own libraries to display and print bitmap data. Changes to the
ALDIM.DLL file do not affect either program.
5. INSTALLING THE NEW IMAGE LIBRARY
Several of the DLL files that ship with PageMaker and Persuasion, including
the ALDIM.DLL, are shared by both applications. In order for both
applications to benefit from this new DLL, it is recommended that you
replace all occurrences of old ALDIM.DLL files on your system with this new
ALDIM.DLL. By default, the old ALDIM.DLL will be found in the C:\ALDUS
directory. It may also be found in the C:\PM4 subdirectory. You should
look in both places on your system.
To update to the new DLL:
a) Run Aldus Setup from within the Aldus Group in the
Program Manager
b) Press Cancel if prompted to select a control (.CTL) file
c) Choose "Single File Copy..." from the File menu
d) Insert the Filter Update disk in drive A: [or B:]
e) Select the A: [or B:] drive in the file list and press OK
f) Select ALDIM.PC~ from the list of files on A: [or B:]
g) Enter the directory on your hard disk where your current
ALDIM.DLL file is located in the "Enter target directory:" box
h) Press OK to copy the file.
i) Quit Aldus Setup and open the Windows File Manager.
j) Switch to the Aldus directory.
k) Rename the file ALDIM.DLL to ALDIM.OLD.
l) Rename ALDIM.PCL to ALDIM.DLL
m) You have now successfully switched out the image library
and can now start PageMaker or Persuasion.
Repeat the process if you need to copy the file to any additional
directories on your hard disk.
Copyright 1992, Aldus Corporation. All rights reserved.