Look Up Tables On NeXT

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3 total messages Started by jj Tue, 03 Nov 1992 19:53

#148

Author: jj
Date: Tue, 03 Nov 1992 19:53

14 lines
829 bytes

I am developping an image processing library which base is the use of  
look up tables to change the dynamic of the image quickly. It does  
not seem to have any LUT on the NeXT, has any one solve this problem  
earlier, how can I access the graphic memory directly to speed up the  
process of my "manual" LUT ??

Thanx for your replies.

Jean J. Dubray     	NeXT is just the best (not for LUT though)

IFE technologies
138, bd de Pontoise
95 370  Montigny, 
France

Re: Look Up Tables On NeXT

#1329

Author: Andrew Loewenstern
Date: Fri, 06 Nov 1992 04:05

19 lines
1399 bytes

In article <1992Nov3.195318.2902@ife.fdn.org> jj@ife.fdn.org writes:
>I am developping an image processing library which base is the use of  
>look up tables to change the dynamic of the image quickly. It does  
>not seem to have any LUT on the NeXT, has any one solve this problem  
>earlier, how can I access the graphic memory directly to speed up the  
>process of my "manual" LUT ??

There are no CLUT's on the NeXT because it has Display PostScript.
But, if you are writing something where user adjusts a parameter and
you want to instantly display the effect in a "preview" before applying
the transformation to the real image, then check out
setframebuffertransfer.

andrew
-- 
andrew@cubetech.com     | "Carpe Nocturn - I get more work done after
Andrew Loewenstern      |  2 a.m. than most people do all day."
Cube Technologies, Inc. |                          - Simson Garfinkle

Re: Look Up Tables On NeXT

#1331

Author: Marcel Weiher
Date: Fri, 06 Nov 1992 17:37

23 lines
1473 bytes

andrew@cubetech.com (Andrew Loewenstern) writes:

>In article <1992Nov3.195318.2902@ife.fdn.org> jj@ife.fdn.org writes:
>>I am developping an image processing library which base is the use of  
>>look up tables to change the dynamic of the image quickly. It does  
>>not seem to have any LUT on the NeXT, has any one solve this problem  
>>earlier, how can I access the graphic memory directly to speed up the  
>>process of my "manual" LUT ??
>
>There are no CLUT's on the NeXT because it has Display PostScript.
>But, if you are writing something where user adjusts a parameter and
>you want to instantly display the effect in a "preview" before applying
>the transformation to the real image, then check out
>setframebuffertransfer.

Why not go for settransfer/setcolortransfer, as these are STANDARD
PostScript operators.  (Why does everybody always suggest the nastiest
sort of hack first?? )

Marcel

PS.:  Andrew, is your mail still broken?  I haven't been able to
get through.

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