🚀 go-pugleaf

In article <1992Nov6.040532.490@cubetech.com> 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.

They exist, but are not actively used.
NeXT uses a BrookTree RAMDAC, so CLUT's do exist and probably accessible
on a Color Station(not on ND).  RAMDAC's RAM part is the built-in LUT.
Nothing is documented about it however, and NeXT certainly
does not want anyone to access it, not certainly recommended
for apps that must coexist with other GUI apps.  I am sure NeXT will
not help you on this.

If you are doing your thing by taking over the whole screen, I would say
go ahead and find the LUTS's addresses and use it, but don't expect to use
GUI while your program is doing its thing.


--
Izumi Ohzawa
USMail: University of California, 360 Minor Hall, Berkeley, CA 94720
Telephone: (510) 642-6440     Fax:  (510) 642-6341
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