| Re: IDL colors on Linux XFree86 [message #13352] |
Sat, 07 November 1998 00:00  |
George White
Messages: 10
Registered: November 1998
|
Junior Member |
|
|
I run XFree86/OS2 with IDL running on an SGI host. XFree86 allows
you to have multiple servers (e.g. host:0.0, host:1.0, etc.) each
with a different color depth. XFree86 does not allow 8-bit visuals
with a "true color" server, so you have to run an 8-bit server to
use 8-bit visuals.
Another difference between XFree86 and X-terminals or workstations is that
the latter generally provide gamma correction to linearize the response,
while XFree86 just gives you what the hardware provides, which is
generally far from linear. Some apps (Gimp) allow you to set a gamma
value, and many cards have hardware support for color calibration that
might some day be available via XFree86, but at present XFree86 is a far
from satisfactory for serious image processing.
In principle, a commercial X-server and suitable hardware could provide
accelerated OpenGL as well as color correction. Has anyone found a
combination that works well for IDL object graphics?
--
George White <aa056@chebucto.ns.ca> tel: 902.426.8509
Bedford Inst. of Oceanography, Nova Scotia, Canada.
On 6 Nov 1998, Dirk Fabian wrote:
> Now, I run IDL by xhosting off my department's server and shipping the
> display back to my machine. I would like to run my machine in 24 or 32
> bit color, but for various reasons, i can only do 16 bits. But, it seems
> that XFree86 only has one visual class that a program can use!
>
> i.e. I would like to force IDL to do 8 bit color (because i definitely
> understand how it works) with device,pseudo_color=8 but it refuses with
>
> % Unsupported X Windows visual (class: PseudoColor, depth: 8).
> Substituting default (class: TrueColor, Depth: 16).
>
> I also tried having idl.gr_visual: PseudoColor in my .Xdefaults file, but
> to no avail. Is there a way to make 16bit act like 8bit so my poorly
> color aware programs will work?
>
> OR, is this a problem with XFree86 that can be worked around, or is there
> another (hopefully free!) solution that can be used?
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
