How to set >8 bit RAMDAC values on a display ?

• Subject: How to set >8 bit RAMDAC values on a display ?
• From: Graeme Gill <email@hidden>
• Date: Thu, 12 May 2005 15:59:40 +1000
• Delivered-to: email@hidden
• Delivered-to: email@hidden
• Organization: Argyll CMS
• User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax)

Looking through the Quartz Services Reference, I found:

<http://developer.apple.com/documentation/GraphicsImaging/Reference/Quartz_Services_Ref/index.html>

CGSetDisplayTransferByByteTable

Sets the values in the 8-bit RGB gamma tables for a display.

CGDisplayErr CGSetDisplayTransferByByteTable (
   CGDirectDisplayID display,
   CGTableCount tableSize,
   const CGByteValue * redTable,
   const CGByteValue * greenTable,
   const CGByteValue * blueTable
);

but nothing that supports better than 8 bit RAMDAC values.
Most graphics cards have had 12-14 bit RAMDACs for the last
10 years or so. Is there any API for setting the higher
precision values necessary for high quality greyscale
calibration of a display ?

(By comparison, both Windows 2k and X11 support 16 bit RAMDAC entries).

thanks,

Graeme Gill.
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Quartz-dev mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/quartz-dev/email@hidden

• Follow-Ups:
  • Re: How to set >8 bit RAMDAC values on a display ?
    • From: Mike Paquette <email@hidden>

• Prev by Date: Using Perl and Core Image?
• Next by Date: Re: How to set >8 bit RAMDAC values on a display ?
• Previous by thread: Re: Using Perl and Core Image?
• Next by thread: Re: How to set >8 bit RAMDAC values on a display ?
• Index(es):
  • Date
  • Thread