I am using IDL5.5 on RH Linux 7.2. I have some troubles with 8-bit
images. "help, /device" tells me the visual class is "directcolor" and
the depth is 24 bits. After displaying an 8-bit image using either tv or
David Fanning's tvimage, the picture is in gray scale no matter what
color table is loaded. If I click the IDL window and hold the mose,
nothing happens. Then if I move the mouse so that the whole window moves
a little bit, colors appear in the IDL window correctly, but other
non-IDl windows have some strange colors. I know that the problem may be
solved if I change the visual class to true. Unfortunately, I cannot
change it.
I have tried two ways.
(1)device, true=24. After typing this command, I open a new window, then
use "help, /device" to check it, it is still running direcrcolor.
(2)I put "idl.gr_visual: True" and "idl.gr_depth: 24" in my .Xdefaults.
Then Below message appears when I try to open a new window.
IDL> window
% WINDOW: X Windows resource "idl.gr_visual" has invalid value: True.
Please help me! Thanks a lot!
Belows are some information which might be helpful.
IDL> window
IDL> help,/device
Available Graphics Devices: CGM HP LJ NULL PCL PRINTER PS REGIS TEK X Z
Current graphics device: X
Server: X11.0, The XFree86 Project, Inc, Release 40100000
Display Depth, Size: 24 bits, (1400,1050)
Visual Class: DirectColor (5)
Bits Per RGB: 8 (8/8/8)
Physical Color Map Entries (Used / Total): 256 / 256
Colormap: Private, 16777216 colors. Translation table: Bypassed
Graphics pixels: Decomposed, Dither Method: Ordered
Write Mask: 16777215 (decimal) ffffff (hex)
Graphics Function: 3 (copy)
Current Font: <default>, Current TrueType Font: <default>
Default Backing Store: Req from Server.
Window Status: ---------------------
id typ( x, y, backing store) id typ( x, y, backing
store)
0: Win( 640, 512, Req from Server)
----------------------
$ xdpyinfo | more
name of display: :0.0
version number: 11.0
vendor string: The XFree86 Project, Inc
vendor release number: 40100000
XFree86 version: 4.1.0
maximum request size: 4194300 bytes
motion buffer size: 256
bitmap unit, bit order, padding: 32, LSBFirst, 32
image byte order: LSBFirst
number of supported pixmap formats: 7
supported pixmap formats:
depth 1, bits_per_pixel 1, scanline_pad 32
depth 4, bits_per_pixel 8, scanline_pad 32
depth 8, bits_per_pixel 8, scanline_pad 32
depth 15, bits_per_pixel 16, scanline_pad 32
depth 16, bits_per_pixel 16, scanline_pad 32
depth 24, bits_per_pixel 32, scanline_pad 32
depth 32, bits_per_pixel 32, scanline_pad 32
keycode range: minimum 8, maximum 255
focus: window 0x1a00012, revert to Parent
number of extensions: 26
BIG-REQUESTS
DOUBLE-BUFFER
DPMS
Extended-Visual-Information
FontCache
GLX
LBX
MIT-SCREEN-SAVER
MIT-SHM
MIT-SUNDRY-NONSTANDARD
RENDER
SECURITY
SGI-GLX
SHAPE
SYNC
TOG-CUP
XC-APPGROUP
XC-MISC
XFree86-Bigfont
XFree86-DGA
XFree86-Misc
XFree86-VidModeExtension
XInputExtension
XKEYBOARD
XTEST
XVideo
default screen number: 0
number of screens: 1
screen #0:
dimensions: 1400x1050 pixels (404x303 millimeters)
resolution: 88x88 dots per inch
depths (7): 24, 1, 4, 8, 15, 16, 32
root window id: 0x31
depth of root window: 24 planes
number of colormaps: minimum 1, maximum 1
default colormap: 0x20
default number of colormap cells: 256
preallocated pixels: black 0, white 16777215
options: backing-store NO, save-unders NO
largest cursor: 32x32
current input event mask: 0x5a20bd
KeyPressMask ButtonPressMask ButtonReleaseMask
EnterWindowMask LeaveWindowMask
PointerMotionHintMask
ButtonMotionMask StructureNotifyMask
SubstructureNotifyMask
SubstructureRedirectMask PropertyChangeMask
number of visuals: 4
default visual id: 0x23
visual:
visual id: 0x23
class: TrueColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x24
class: TrueColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x25
class: DirectColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
visual:
visual id: 0x26
class: DirectColor
depth: 24 planes
available colormap entries: 256 per subfield
red, green, blue masks: 0xff0000, 0xff00, 0xff
significant bits in color specification: 8 bits
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