QUESTION:
Customer has a scanned image file and is trying to display on an
Xstation 130. It appears distorted with characters backwards and
almost Cyrillic. However when same image is displayed on a 6091 console
or Xstation 150 it worked fine. We are hence trying to determine what
the cause and solution is to display the image on the Xst130.
I compared the output from the command xdpyinfo and found the following
differences:
Attribute Xstation 130 (image fails) 6091 (image works)
--------- -------------------------- ------------------
a) image byte order LSBFirst MSBFirst
b) bitmap unit, 32, LSBFirst, 32 32, MSBFirst,32
bit order,
padding
c) number of extensions: 5 11
with the 6091 Console
having xColormapExtension,
xDirectAccessExtension
d) options:
backing-store Yes No
save-unders Yes No
e) red, green,blue 0x0,0x400000,0x1 0x0,0x0,0x0
masks
Q: From the above differences, is there any characteric(s), we can
change so that the image appears correctly on the Xstation 130.
If yes, please provide the procedure to change it.
---------- ---------- ---------- --------- ---------- ----------
A: To test this question I displayed a tiff image on an Xstation 130,
an Xstation 150, and a model 250 6091 console. In each case
the image displayed correctly. From my testing, I conclude
that the problem is probably due to one of two things.
1) The application you are using does not take into account
the LSBFirst MSBFirst byte ordering. The specifications
for Xwindows allows both LSBFirst and MSBFirst ordering.
If you application is assuming MSBFirst ordering and does
not take into account the possibility of LSBFirst ordering,
it may display images as you described. The application
I used, 'xtiff', must take byte ordering into account.
If this is the case, then you should see if your application
has some option to take into account LSBFirst ordering or
use an application like xtiff that does take this into
account.
2) The only other difference I saw was your green and blue
masks on the Xstation 130. My Xstation 130 had a color
mask similar to your 6091. I was unable to determine
if this could be changed or how to change this.
The problem is most likely due to #1. If you can find
an application like xtiff that seems to take the byte ordering
into consideration, and the image still displays incorrectly,
please respond back and I will research the second possibility
further.
If you do respond back, please provide the following information.
1) How much VRAM and DRAM does the Xstation 130 have?
2) What type of display is on the Xstation 130?
3) What is the corresponding xdpyinfo (a-e) from the Xstation 150.
4) Also, please provide any additional information that will
allow me to recreate or reproduce this problem.
---------- ---------- ---------- --------- ---------- ----------
QUESTION:
Thanks for a thorough response.
1) VRAM is 2MB; DRAM is 8MB on Xst130
2) Display is a 6091-19i
BUT HERE's the CRUX:
The output from xdpyinfo on the xstation 150 that works fine shows the
image byte order as: MSBFirst
It appears that the image byte order is the culpritĒ
Customer has asked if there is a way to change this on the XST130 from
LSBFirst to MSBFirst?? We ARE checking the applications capabilities
as you suggested.
---------- ---------- ---------- --------- ---------- ----------
A: There is no way to change the Xstation 130 to use MSBFirst instead
of LSBFirst. This property is hard-coded in the Xstation 130's
Xserver.
This issue did come up once in the past when someone was trying
to import images into WordPerfect. The image displayed incorrectly
on the Xstation 130. In that case, the customer had to go to
WordPerfect because it was the application that was not written
to handle the LSBFirst possibility. Again LSBFirst is allowed
in the specifications for X.
I agree that you are taking the proper steps by checking the
applications capabilities.
---------- ---------- ---------- --------- ---------- ----------
This item was created from library item Q659000 CRKQS
Additional search words:
CONSOLE CRKQS DISPLAYING HARDWARE IMAGE IX MAY94 OK OZNEW PROBLEM
RISCSYSTEM RISCXSTA TIFF WORKS XSTATION XSTATION130 6091
WWQA: ITEM: RTA000042249 ITEM: RTA000042249
Dated: 03/1996 Category: RISCXSTA
This HTML file was generated 99/06/24~12:43:17
Comments or suggestions?
Contact us