Re: Color Navigator 4.1 - L*
Re: Color Navigator 4.1 - L*
- Subject: Re: Color Navigator 4.1 - L*
- From: Ken Fleisher <email@hidden>
- Date: Tue, 25 Oct 2005 07:54:44 -0400
On Oct 25, 2005, at 4:58 AM, Nathan Duran wrote:
Exactly what it is they think they have a patent for is never
specified.
The nice thing about patents is they are searchable online (watch for
unintended line breaks...):
http://patft.uspto.gov/netacgi/nph-Parser?
Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/
srchnum.htm&r=1&f=G&l=50&s1=6,937,249.WKU.&OS=PN/6,937,249&RS=PN/
6,937,249
They cannot patent L*, of course, but they sure can patent a method
that they developed for device characterization, for which choosing L*
to map gamma is a part of. I did not do a thorough search, so there may
be another patent they were specifically referring to in the
advertising clip that was quoted. Here is a relevant part of the patent
claim in the above link:
15. A method for creating characterization information for a first
display device for use with a second display device comprising the
steps of:
initializing lookup table values of said first display device;
measuring the output of said first display device resulting in display
device measurements;
determining a gray ramp according to said measurements;
mapping said gray ramp to L* of the CIELAB color model;
adjusting said lookup table values according to said gray ramp mapping;
and,
determining an ICC color profile according to said gray ramp and said
adjusted lookup tables.
16. The method of claim 15 including:
measuring an RGB color map; and,
determining an ICC color profile according to said measured RBG color
map.
17. The method of claim 15 including transmitting said ICC profile to
said second display device.
18. The method of claim 17 including:
determining the gamut map of said first display device; and,
including said gamut map within said ICC color profile.
19. The method of claim 15 including:
storing said ICC color profile;
retrieving said ICC color profile;
comparing said luminance of said first display using said retrieved ICC
profile with said measurements used when determining said ICC color
profile.
20. The method of claim 15 including:
associating said ICC color profile with an image file;
transmitting said ICC color profile with said image file to said second
display device so that said second display device can display said
image with said ICC color profile.
21. A method for creating characterization information for a first
display device for use with a second display device comprising the
steps of:
initializing lookup table values of said first display device;
segmenting said first display device into a plurality of grid areas;
measuring the output of at least one said grid area;
determining a gray ramp according to said measurements;
mapping said gray ramp to L* of the CIELAB color model;
adjusting said lookup table values according to said gray ramp mapping;
determining an ICC color profile according to said gray ramp and said
adjusted lookup table values.
22. The method of claim 21 including:
measuring an RGB color map for at least one of said grid areas; and,
determining an ICC color profile according to said RGB color map for at
least one of said grid areas.
I hope this was useful to some...
Ken Fleisher
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