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Over 256 colors ??? [message #6541]

Fri, 05 July 1996 00:00

john
Messages: 3
Registered: July 1996

Junior Member

Hi,

I have this little problem with my windows 95 screen settings in combination
with IDL. When I set my screen driver to more than 256 colors IDL does not
seem to update the colors. Using XLOADCT for example does not change the
apperance of an image until a new 'TV' command is entered. Also the default
color of plot axis is changes to yellow or red.Probably IDL
supports only 256 colors, but is there a way to circumvent this, so I can set
my screendriver to a better resolution?

I have a second question. When I use the function TVRD() the result is an
array with a resolution less than 256, which I would expect. Does anyone know
a solution for this?

John van Noort

John@top.tn.utwente.nl

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Re: Over 256 colors ??? [message #6588 is a reply to message #6541]

Thu, 11 July 1996 00:00

jyoung
Messages: 5
Registered: May 1996

Junior Member

Norbert Hahn (hahn@hrz.th-darmstadt.de) wrote:

: If I'm not mistaken IDL supports only 256 colors using a look up table and
: 16 Meg colors in true color mode (RGB). The MS Windows version has even
: less than 256 colors because 20 of them are reserved by MS Windows. So
: you can only define 236 colors.

In Win95 I have only been able to use 226 colors with my system. I have to
switch between 24-bit true color back to 256 color mode in Win95. It also
changes the color of any other programs running, or sometimes IDL takes over
all other resorces and it becomes a hassle to run anything but IDL! I hope
in version 5 it doesn't have these problems in a Win95 system.

Just my $0.02 worth,

Jason Ray Young
EPSCoR Research Assistant
Montgomey, WV 25136

phone: 304-442-1021

e-mail: jyoung@olie.wvitcoe.wvnet.edu

hypertext: URL=http://www.wvitcoe.wvnet.edu/~jyoung

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