From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 14D23C02185 for ; Fri, 17 Jan 2025 09:06:47 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 14A9F10EABF; Fri, 17 Jan 2025 09:06:46 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=haloniitty.fi header.i=@haloniitty.fi header.b="KItksaI/"; dkim-atps=neutral Received: from whm50.louhi.net (whm50.louhi.net [77.240.19.51]) by gabe.freedesktop.org (Postfix) with ESMTPS id 24CA210EAB9; Fri, 17 Jan 2025 09:06:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=haloniitty.fi; s=default; h=Content-Type:MIME-Version:References: In-Reply-To:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=VPJ6kjT2KUa371l28txauwNyjykZPJKUwUkZ2naKUOk=; b=KItksaI/ehu5V3y5xnqu/n/2jj 6ZudIoUHs2JCLG0PaMOjDgpTmR62RJIlhL8Yd9RDfUdgsD5/g2m/mEm3V5tzW5zcPJMnNWcHf+sh9 KWmRinvSp41YMaec6ZWA1GthwCAdJoSzoxOXA8St0/K/J6DfpDGz+57DEvIIr2nq+VNzvTeaJQAem Mh5TnLMmcG8qmgRPZn4ajVIfnIf2EkCtT1U6GvjIk5v+gZhAvrENJGvYRN4qGm1dGQODT5DrXHDQu fxreyTL+5SJxqCedDZtPq/yYO1J3wiUGTzGHR7A81vcRbuUoA5obQgbvktraVxSG4Z8sISQmedrD5 yUdi5F8Q==; Received: from [194.136.85.206] (port=33082 helo=eldfell) by whm50.louhi.net with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96.2) (envelope-from ) id 1tYiJO-0004tv-2S; Fri, 17 Jan 2025 11:06:42 +0200 Date: Fri, 17 Jan 2025 11:06:41 +0200 From: Pekka Paalanen To: Alex Hung , Cc: , , Subject: Re: [V7 31/45] drm/colorop: add BT2020/BT709 OETF and Inverse OETF Message-ID: <20250117110641.7040f712@eldfell> In-Reply-To: <20250116105622.577533fc@tisha> References: <20241220043410.416867-1-alex.hung@amd.com> <20241220043410.416867-32-alex.hung@amd.com> <20250116105622.577533fc@tisha> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: multipart/signed; boundary="Sig_/2AYt4dGga0HNm7b1Cf3+1lP"; protocol="application/pgp-signature"; micalg=pgp-sha256 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - whm50.louhi.net X-AntiAbuse: Original Domain - lists.freedesktop.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - haloniitty.fi X-Get-Message-Sender-Via: whm50.louhi.net: authenticated_id: pekka.paalanen@haloniitty.fi X-Authenticated-Sender: whm50.louhi.net: pekka.paalanen@haloniitty.fi X-Source: X-Source-Args: X-Source-Dir: X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" --Sig_/2AYt4dGga0HNm7b1Cf3+1lP Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Thu, 16 Jan 2025 10:56:22 +0200 Pekka Paalanen wrote: > On Thu, 19 Dec 2024 21:33:37 -0700 > Alex Hung wrote: >=20 > > From: Harry Wentland > >=20 > > The BT.709 and BT.2020 OETFs are the same, the only difference > > being that the BT.2020 variant is defined with more precision > > for 10 and 12-bit per color encodings. > >=20 > > Both are used as encoding functions for video content, and are > > therefore defined as OETF (opto-electronic transfer function) > > instead of as EOTF (electro-optical transfer function). > >=20 > > Signed-off-by: Alex Hung > > Signed-off-by: Harry Wentland =20 >=20 > Hi, >=20 > why would a display system ever use BT.2020 or BT.709 OETF or its > inverse? Sorry, this is more for my own curiosity, not an argument against the patch. Since hardware designers decided to incorporate these curves explicitly, what use was in mind? It's likely something I have overlooked. 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