| Re: off-white background in IDL-generated bitmaps [message #30351] |
Thu, 18 April 2002 12:01  |
nobody@nowhere.com (S
Messages: 55
Registered: July 2001
|
Member |
|
|
I tried the Cube=6 option, this does give a "whiter" white. It reduces the
number of colors from 57 to 26 as well. The image is a shaded surface, and
using this option gives the surface a "grainy" appearance. I'm sure you've
encountered this, but thought I'd add it here to the discussion. Thanks again
for the advice!
On Thu, 18 Apr 2002 17:34:29 -0000, Steve Smith<steven_smith>
<nobody@nowhere.com> wrote:
> Thanks David! So I am correct that it is an indexing problem, apparently
> encountered before. Many bows and endless adulation, you are a trememdous
> source of IDL knowledge! I'll give the Cube=6 a try and see if it helps,
> thanks again!
>
> On Thu, 18 Apr 2002 11:21:21 -0600, David Fanning <david@dfanning.com> wrote:
>> Hi Steve Smith<steven_smith>, you write:
>>
>>> I generated some bitmap images (GIF, BMP) using IDL
>>> and tvrd, they look good on the screen, but when inserted into MS-WORD
>>> documents, the formerly white background becomes somewhat darkened or
>>> shaded and stands off from the white page background. Is there a 'trick'
>>> to make a bitmap image in IDL (with white background) that won't do
>>> this? I suspect it has something to do with color indexing, so perhaps
>>> someone will say 'use a non-indexed image format'. I do need compression,
>>> and since the bitmaps have text in them, JPEG usually isn't a good idea.
>>> Ideally, a vector-drawn text combined with the bitmapped portion of the
>>> figure would be best, but I'm not aware of a way to do this in IDL. I'm
>>> using idl 5.2, by the way. thanks for any suggestions!
>>
>> Here is an article that explains what is going on and how
>> to correct it:
>>
>> http://www.dfanning.com/color_tips/gif_gray.html
>>
>> Cheers,
>>
>> David
>>
>> --
>> David W. Fanning, Ph.D.
>> Fanning Software Consulting
>> Phone: 970-221-0438, E-mail: david@dfanning.com
>> Coyote's Guide to IDL Programming: http://www.dfanning.com/
>> Toll-Free IDL Book Orders: 1-888-461-0155
>
>
> --
> Steve S.
>
> steve@NOSPAMmailaps.org
> remove NOSPAM before replying
--
Steve S.
steve@NOSPAMmailaps.org
remove NOSPAM before replying
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
