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說明:
License information:
The author, Douglas Campbell, offers this
program without any warranty express or implied, including
fitness of use. Nor is the author responsible for any damage
incurred as while using the program. For example, if your
laptop display catches fire and burns while you are running this
program, or your video adaptor burns out, or any of a number of
nasty things happen while this program is operating, the author
will not pay for repairs or damages.
While this program was virus-free when it left my installation,
you should still check it before you use it.
The program is copyrighted and any use for fee is prohibited
without the permission of both Douglas Campbell and Borland
International.
Any information concerning bugs or successful use should be
addressed to:
Douglas Campbell,
CIS id 73567,2664,
AOL name DOUGYC.
I will issue periodic updates based on this information.
Program information for CHKPXLS.EXE:
Laptop manufacturers do not provide to purchasers information
concerning screen defects (stuck pixels) present in the products
they sell. Caveat Emptor (Let the buyer beware) is presently
the order of the day. The attached program, CHKPXLS.EXE,
permits a user to check the screen of any IBM-compatible VGA
laptop, either before or after purchase, for potential defects,
and to make objective judgements concerning the number of
defects present, as well as subjective judgments concerning the
severity of the defects and their impact on the user. If this
software is utilized prior to purchase and defects are
discovered, a decision can be made to either negotiate a lower
price or to not go through with the purchase.
Stuck pixels come in two major flavors: ON or OFF. A pixel
which is stuck on is always lit, while a pixel which is stuck
OFF can never be lit. For monochrome displays, these are the
only error states possible; for polychromatic (color) displays,
each pixel consists of three monochromatic subpixels (generally
Red, Green, and Blue), and any combination of these can be stuck
ON or OFF. CHKPIXL allows you to visually check the
characteristics of each pixel on your display by performing the
following actions:
1) For each primary color (Red, Green, Blue), display each pixel
turned ON, while surrounded by neighboring pixels which are
turned OFF. The only place where this will fail to visually
isolate stuck pixels is when they occur at the edge of the
screen (if you can't see them, who cares about them). In this
test, pixels which are stuck OFF will show up as "holes" in the
displayed pattern. In order to do this for each pixel in the
display, four separate screens for each color must be displayed,
to wit:
0000 0000 0101 1010
0101 1010 0000 0000
0000 0000 0101 1010
0101 1010 0000 0000
2) Display a screen with all pixels turned OFF. Pixels which are
stuck ON become highly visible.
CHKPXLS.EXE, when run from the DOS command line or a Windows DOS
or OS/2 DOS/MDOS full screen session, displays a HELP screen
showing copyright information and an explaination of the user
interface. It is capable of operation in either AUTOMATIC or
MANUAL modes. The default is AUTOMATIC, in which the steps
described in (1) and (2) above are performed; the user hits the
Enter or Return key to shift to the next step of the test. In
MANUAL mode, user keystrokes as described in the HELP screen
control CHKPXLS actions.
The HELP menu is accessible at any time by pressing the ESC key;
pressing the ESC key again while the HELP menu is displayed
exits the program.
This program has been tested under DRDOS 6.0, MSDOS 6.0, OS/2
v2.1, and Windows 3.1 on an IBM ThinkPad 700C, as well as an ISA
clone computer with a standard VGA card.
Pixel Notes: Human eyes are most sensitive to the green portion
of the color spectrum. Hence, a Green pixel stuck OFF is more
offensive than a Red pixel stuck OFF. Pixels of any color stuck
ON are more offensive than pixels stuck OFF. Many manufacturers
will replace a screen with just one pixel stuck on, but will
balk at replacing screens with several pixels stuck OFF, unless
those pixels are arranged in a pattern which could be mistaken
for a decimal point. Note that isolated stuck pixels are far
less harmful than a dense cluster of them.
Apple Powerbook and other non-ISA computer users: While this
program will not work on your machine, you may be able to
duplicate some of its effects by modifying your desktop to have
alternately each of the bit patterns specified above. While
time-consuming, this method will give you a far better
indication of stuck pixels than the all-on method mentioned in
the August MacUser magazine. For X-windows users, try to
minimize the numbers of Icons and move them about the screen
after changing the desktop. For Mac users, you will have to pay
special attention to the menu area, since this cannot be
obscured by the desktop method. Hopefully, some Mac user
proficient in C will build the Mac equivalent to this program
which addresses all pixels on a PowerBook screen.
此文章被評分,最近評分記錄| 財富:3 (by MaverickWu) | 理由: 主動分享心得！ | |
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