From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) by finch.gentoo.org (Postfix) with ESMTP id 01D32138448 for ; Wed, 9 Sep 2015 05:52:22 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 1F6C5E089A; Wed, 9 Sep 2015 05:52:09 +0000 (UTC) Received: from mail-wi0-f173.google.com (mail-wi0-f173.google.com [209.85.212.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id D0AA6E088D for ; Wed, 9 Sep 2015 05:52:07 +0000 (UTC) Received: by wiclk2 with SMTP id lk2so143453635wic.0 for ; Tue, 08 Sep 2015 22:52:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:reply-to:to:subject:date:user-agent:references:in-reply-to :mime-version:content-type:content-transfer-encoding:message-id; bh=KbD1jw3JG21jDzi9cFawxm+yc9xr69wrbcFwgD25Gc8=; b=PWqsas4wKIWGp3WuAGz9h3oZFRzWulB11EXFmA+fuiCFJgQzdFGGFjE/j7ci0ZKq1w Bm84vbaDnuP5ZnCklanlyCDLxB4Vl9iiRAVbN+b7+kn77JPIFXYLut90pYtqTVuJaZ3b nVzP/23c881E7nNzMAq4rNmF7LEjq9gTclae87VKsRvh6tFHBcg0xlXoZxNZOYvSDk16 dREw5EsCMAnrEC9Ug70QJNdJaFnINFbnksp6/CeEjt9CPi/tw6WXf3cCmHRh6qdSTBu2 +UwR770gu+IcgO653ONt5/0KlccqDo5h7YXdFQmr05pOgxHoIEdc68v1JORxJl0fS16J mdZg== X-Received: by 10.180.106.3 with SMTP id gq3mr52271726wib.50.1441777926439; Tue, 08 Sep 2015 22:52:06 -0700 (PDT) Received: from dell_xps.localnet (230.3.169.217.in-addr.arpa. [217.169.3.230]) by smtp.gmail.com with ESMTPSA id db8sm8316810wjb.41.2015.09.08.22.52.05 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 08 Sep 2015 22:52:05 -0700 (PDT) From: Mick To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] CMYK comparison to sRGB between platforms Date: Wed, 9 Sep 2015 06:52:03 +0100 User-Agent: KMail/1.13.7 (Linux/4.0.5-gentoo; KDE/4.14.8; x86_64; ; ) References: <201509081942.10580.michaelkintzios@gmail.com> <55EF65F1.7040807@wraeth.id.au> In-Reply-To: <55EF65F1.7040807@wraeth.id.au> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart2111590.RXOP6Ox2x6"; protocol="application/pgp-signature"; micalg=pgp-sha256 Content-Transfer-Encoding: 7bit Message-Id: <201509090652.05401.michaelkintzios@gmail.com> X-Archives-Salt: 8e501edb-e7e1-48b5-b3a6-bf76e3e129c2 X-Archives-Hash: 5d6237482fbb1dfb70943512b607426b --nextPart2111590.RXOP6Ox2x6 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Tuesday 08 Sep 2015 23:49:21 wraeth wrote: > On 09/09/15 04:42, Mick wrote: > > On the same hardware I noticed that a CMYK photograph converted to > > sRGB looked mostly the same (indistinguishable) on Linux, but the > > sRGB colours were brighter on MSWindows. > >=20 > > I tried this by dual booting between MSWindows and Linux. > >=20 > > Then I tried it by running MSWindows within a VM on a Linux host > > and the MSWindows showed a clear difference in brightness between > > the two formats. > >=20 > > Finally, I checked on an AppleMac and the difference between the > > CMYK and sRGB photographs was even more prominent than MSWindows. > >=20 > > So, the Linux renedering seems to be misleading the user. Have you > > noticed the same? > >=20 > > BTW, both Linux machines that I tried this on are running radeon > > drivers - are these to blame? The AppleMac is running Intel > > graphics with its 'retina' monitor. Is it a matter of somehow > > tuning the Xorg settings on my Linux PCs? >=20 > While I'm certainly not an expert on this sort of thing, one key piece > of information that would affect this is what software you used. > Specifically, did you use the same software on each platform > (therefore the same method of conversion)? The conversion from CMYK to sRGB was performed on Linux. The user=20 experimented with different CMYK.icc and sRGB.icc files using imagemagick a= nd=20 also Gimp. Then the original CMYK and resultant sRGB files were moved arou= nd=20 different PCs and OS and their difference observed. The difference was mor= e=20 prominent in a MacBook Pro, next (almost equally) visible in MSWindows 7=20 either run natively or in a VM and finally least visible difference (you ha= d=20 to squint to see it) was in the Linux PCs. The only common thing between the Linux PCs was that they are both running= =20 Gentoo but have different radeon cards & different firmware. =2D-=20 Regards, Mick --nextPart2111590.RXOP6Ox2x6 Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAABCAAGBQJV78kFAAoJELAdA+zwE4Yedh0H/RlS9tt/ZtBr34uUBNlpIsgH QCJNFZJaipK7f6pa20INwpMbLEbxhtvuXlYLupz5Fgjl2f4Jtjfo1GhZgW/ojuEm v/vllew/X8lTNAoZmf7xcB49YnDlVUOeryiSS78qv0Y5+/sPBoUFDPfC/tyCDo0w OXzIgxh0Jms1+qZF7Fv25YQUp+833/QLoUeq+uOuf8cD3m5vGK2rbH1AclDfeE1o Bb4fE5RIW/R1Nhsmfggmv6/FBJwOt064snhTrZZtXMAC8aftgnFxi0plvcDHNHcf UpjT28AB00mOS2YDVKItzQq8R82V1c9LdPO1soge5DKKuuHO9YEpBgP0FCd3Vjk= =ZQkH -----END PGP SIGNATURE----- --nextPart2111590.RXOP6Ox2x6--