Re: rgb <--> ycc

Article View: adobe.postscript.programming

Article #1344

Back to adobe.postscript.programming Previous Next

#1344

From: Gernot Hoffmann
Date: Fri, 24 Jan 2003 11:24

23 lines
1296 bytes

Miklos,

do you mean YCbCr as used for JPEG ?

The matrices Cyr and Cry are here on page 18:
 <http://www.fho-emden.de/~hoffmann/colcie290800.pdf>

Should be read with column matrices ( ) as

(Y Cb Cr) = Cyr * (R G B)

(R G B ) = Cry * (Y Cr Cb)

This is for the NTSC RGB space. For JPEG it doesn�t matter,
because the conversion is applied forward and reverse.
For other applications NTSC is actually outdated .
JPEG doesn�t apply Gamma conversions, the raw image data
are used.
Sorry for the huge file (450 kBytes).

Best regards

Gernot Hoffmann

Technical Details

Message-ID: <1de78788.0@WebX.la2eafNXanI>

Path:

arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!sn-xit-02!sn-xit-03!sn-xit-01!sn-xit-09!supernews.com!news.maxwell.syr.edu!fr.clara.net!heighliner.fr.clara.net!newsfeed01.sul.t-online.de!t-online.de!WebX

References: <1de78788.-1@WebX.la2eafNXanI>

Show Full Headers

Complete Article Headers

X-Google-Language: ENGLISH,ASCII
X-Google-Thread: 10c61a,351a1b1b12c74780
X-Google-Attributes: gid10c61a,public
X-Google-ArrivalTime: 2003-01-24 03:37:50 PST
From: "Gernot Hoffmann" <hoffmann@fho-emden.de>
Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!sn-xit-02!sn-xit-03!sn-xit-01!sn-xit-09!supernews.com!news.maxwell.syr.edu!fr.clara.net!heighliner.fr.clara.net!newsfeed01.sul.t-online.de!t-online.de!WebX
Newsgroups: adobe.postscript.programming
Subject: Re: rgb <--> ycc
Message-ID: <1de78788.0@WebX.la2eafNXanI>
Date: Fri, 24 Jan 2003 03:24:14 -0800
References: <1de78788.-1@WebX.la2eafNXanI>
Lines: 23
MIME-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 8bit

Reply to Parent Message