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 X-Spam-Level: X-Spam-Status: No, score=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B747AC433FE for ; Wed, 22 Sep 2021 15:28:49 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 82D70611CA for ; Wed, 22 Sep 2021 15:28:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 82D70611CA Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amd.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 989B289D7C; Wed, 22 Sep 2021 15:28:47 +0000 (UTC) Received: from NAM11-DM6-obe.outbound.protection.outlook.com (mail-dm6nam11on2064.outbound.protection.outlook.com [40.107.223.64]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5C43989D7C; Wed, 22 Sep 2021 15:28:46 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=YQC0sQZA4HhfqcMULBZAjlUU+BDatQTJEqIeeA+0PsZMoRlqJS7Y0EtNcIGT/JPHAhdFegTg7pCbCigL4XSH1qcGaJC0tJAUYZ8fmhEQE7aV3zv6rwIFAp7RjDx6gCsHPsHmxReDqVHT2bV4rgvBUAPlYKassbA3tLqwYhaPF2lFzMqsIh4XGQ39U91RfFClC1d14Arkp1hDkTrCWf2QsYx/t6zGxI9fkCbfHC7HX1uVn4QdxrcD3ZGXpWrsyLGY9v1Q0u0IBaw8gDVgMR17NKXE9nXJYe4Owq7c91dM7feSYibqbXbx2P98P8joegiXr1otAaN3C8Wy/7V9uaRCNQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=G1fOHXxw4KoCjxn5QC+kW69aNX4hSh1x/EIkPzJsev8=; b=ZoX06r7btmNDCACkXtUlEECPqd8Ft/TYSclAHq/eQeyEgXeLfrHr3GKHqHbgxxPiGSD0W2yWhmNt5+ZxMFUPrgEJAhxnY2UbkHV7ROHo1NHMzucDIw+/6ynMbQXXgBiluhHuX8nHdKtSRK3Ek7xfG6YPjvDKmnfYpOLKNKvplMyBZ9TBOYe5sYYj90vavLoEErwKYf724js2rBhM+Slk777Bt6wL0ygaAs3NcPrvldiOqU8A737rICSS778XiVsRHZl0OriclPJCHRHClLn7aDmzwrBceW/EIwptPYuokSmF5yZqo+oJFnFHwUOj/8vbAmvSHM+uXmJBnjTO80rb1w== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=G1fOHXxw4KoCjxn5QC+kW69aNX4hSh1x/EIkPzJsev8=; b=L3ZNa3tbIMRQ7VhQmQ5vUj/N+cC6MZMSwrSzhn1TwnUX7Lm1GD/i2gBu6hyy98sYmCDpNwbhWdH+1S1XQnG6d2UA9P252N5YrSUnAiXykw0AKcYO232FgGVOfKLC8aoEDieAA/PoAEi1RPJXN8toagpUlCto+z+gL5+I5MmGo14= Authentication-Results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=amd.com; Received: from CO6PR12MB5427.namprd12.prod.outlook.com (2603:10b6:5:358::13) by CO6PR12MB5428.namprd12.prod.outlook.com (2603:10b6:5:35c::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4544.14; Wed, 22 Sep 2021 15:28:43 +0000 Received: from CO6PR12MB5427.namprd12.prod.outlook.com ([fe80::d82f:e8c3:96ac:5465]) by CO6PR12MB5427.namprd12.prod.outlook.com ([fe80::d82f:e8c3:96ac:5465%9]) with mapi id 15.20.4544.014; Wed, 22 Sep 2021 15:28:43 +0000 Message-ID: <823898e8-a8fe-cc74-e5b4-c4907826efbc@amd.com> Date: Wed, 22 Sep 2021 11:28:37 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.1.1 Subject: Re: [RFC PATCH v3 1/6] drm/doc: Color Management and HDR10 RFC Content-Language: en-US To: Pekka Paalanen Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, sebastian@sebastianwick.net, mcasas@google.com, jshargo@google.com, Shashank.Sharma@amd.com, Deepak.Sharma@amd.com, Shirish.S@amd.com, Vitaly.Prosyak@amd.com, aric.cyr@amd.com, Bhawanpreet.Lakha@amd.com, Krunoslav.Kovac@amd.com, hersenxs.wu@amd.com, Nicholas.Kazlauskas@amd.com, laurentiu.palcu@oss.nxp.com, ville.syrjala@linux.intel.com, jeremy@jcline.org, Brian Starkey References: <20210730204134.21769-1-harry.wentland@amd.com> <20210730204134.21769-2-harry.wentland@amd.com> <20210915170127.31377385@eldfell> <4ed51ca0-ca98-cf84-33ed-ab172e3548d3@amd.com> <20210921163158.688c26bc@eldfell> <0c673cf8-2b90-c1ca-a0b0-c809e7e10c2c@amd.com> <20210922113105.2e42754c@eldfell> From: Harry Wentland In-Reply-To: <20210922113105.2e42754c@eldfell> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: YQBPR0101CA0190.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:f::33) To CO6PR12MB5427.namprd12.prod.outlook.com (2603:10b6:5:358::13) MIME-Version: 1.0 Received: from [192.168.50.4] (198.200.67.104) by YQBPR0101CA0190.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:f::33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4544.14 via Frontend Transport; Wed, 22 Sep 2021 15:28:40 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: ef98c44e-8581-478e-edfe-08d97ddda90c X-MS-TrafficTypeDiagnostic: CO6PR12MB5428: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:CO6PR12MB5427.namprd12.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(366004)(44832011)(6916009)(7416002)(86362001)(83380400001)(508600001)(66476007)(66556008)(8676002)(66946007)(6486002)(966005)(31696002)(38100700002)(2616005)(956004)(186003)(316002)(16576012)(5660300002)(8936002)(4326008)(31686004)(2906002)(36756003)(6666004)(26005)(53546011)(43740500002)(45980500001); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?OGp1SVdpWTlmRzhzTUNzQ2JqYjNaYTZDU2FGL2hPMGdXWGRiWW1veUlmSGtL?= =?utf-8?B?ZTlFVnF2RVY0TkVLdDhYS2VIWmhYcjY4TlI0RTYxMDRCL1hDTEY2dmFYTUFa?= =?utf-8?B?bkRnejdhSlZMeG9vOE50YlJWemRpaVFsYXNHZUZTR3pSVHJ2aHpRVmI0aXds?= =?utf-8?B?L2JzY1BEeXExQjhLOXVFVFlJbE1PMzF6aUhmSUhkYzhSNDJvWVRWd0Y2MkN4?= =?utf-8?B?aXFxV0t6VjhlcGovMlhIYmM1LzNNNHp5RUlNWkEvSlgwU1FZS2lBMEZ6QVRZ?= =?utf-8?B?enBnWGhIQ3U3bldGdy9VWmVDVGNMV0JueW9FMTB0MXpPNkNtWFJ2VkwyU0hh?= =?utf-8?B?ckUxQUFaNGVKeHR5Y2tnZEFaVVphV2Q5SkxQSXl1VUdTWi9hSjZkZzUzYml6?= =?utf-8?B?NG9nUVd4L1VQWFdrTVJDNjdNbjc5RWdWdWdiZDFMUGE4OUJIbXFsQm9XQm9H?= =?utf-8?B?a3FYQkdVeDVIN3krUkVGNDBUNmJvUkhyYkc0N2ZzQ3BYVmQ0OHJheEtjRUtq?= =?utf-8?B?UG5JdHpLbExyMmFXZlB4Vk1sTzJhMWtjTTE5a2FMa3VlVGd2TFc3M0dHUEd5?= =?utf-8?B?Uit3QmZ6WEg5aGhubk5MS0JpZUE5SEZUUFd5ejFsaW9pOTJvZStDNmRBMDF6?= =?utf-8?B?WUhRaC9xcW9uREtNb1dzV0VaOXVlWWtUU25DTnF2T1BhWnF3ODIwRWxtRmVZ?= =?utf-8?B?eW9nenFiZ1d3RG1yRGhFNnlMVjd1UDJCcWtIRmR2aG1vR3NCT1hLRU00UVY5?= =?utf-8?B?RnFET0h5SDNtVFZWcmNYZHVZWFNkc2paRFp5d0xNRHN0VzRHMmVHVGFielV6?= =?utf-8?B?d25WZUdML2dEbWRNYnFjOTR2VnR2UVdlTlJwR0EySEJOMHpZNTNQOFpsdVUy?= =?utf-8?B?OE0razZxWmQyZGx0WlVUWXZST1FtaHN5MVlrZ25XQjRvaW16SXpVa2k1WGZt?= =?utf-8?B?M2FCcUhjVzcydWIvRDV0SVJoaTJYODJPN2I0cGM5ZEVIRThhdFI0RzlxeUVr?= =?utf-8?B?RDF6UDVTWU9PZUUvMEQxVjFRakdmSDcwaWFkVzdHV1Q4emdWazJ3SnVJa1FS?= =?utf-8?B?NVdjUWlCRHBzNTRaclhpdEhaOFQyakoreDNuRDRqUk05NkN5MFpRNFdzQWFw?= =?utf-8?B?NnlMMFprblJNSVhXRHZLZUdmeHNId0Izb1NTMnJOV3diZWc5SVJYS2Z1UVFY?= =?utf-8?B?WGNOUmdVVEs3b1o2dGkrNmNGdW91dHZON08vNW5ldmJlemtFam9MSE42LzY0?= =?utf-8?B?Zmp1Mjk3UmRqWms3QzlTYzRYZ1JZN1FTQWErQ0ZBdVlzZFIwZGI2MzVrd3dD?= =?utf-8?B?S0o0cE9URTJ5d0VFUktrazYyZkkxTUM4RWJhaVFyR0dSWjJiUEUxT3BkWFM1?= =?utf-8?B?YTBKT2pDNS83dXRZOHFHc3JQRWlPSGQ5clg2MkFUMHNNUmYrcVNVZVJjMW1i?= =?utf-8?B?V0hhMFVZY0FhRWVaMmVWQTBpMnJXYWdBeHR3UXNwNm1Lc1M4aW5QMlB4b3Uy?= =?utf-8?B?ZmZVM1p2Nm5VMHZNNDdJd1hNVHdWTDVsQldGRHRTcnZ6ODNuY2lGd25EeG9P?= =?utf-8?B?TnUrVkZxeUM5QVVwOWZmcnJxK0YwdE9CS1dKdytTOXg3NjhZcWVHY05hOVBC?= =?utf-8?B?TEx2NjBpbnE2UG5VR2xJTS9YU3YyNlVRTUtMWXh5TXhKMi9veTRUdkxLcWcz?= =?utf-8?B?ZDlFOFRtWTE5UExQUnlmKzlDdE8yS2RUTE9xb0FPcDVtcS9XdEpsVXN3VEN2?= =?utf-8?Q?ezpCO473fdufFW1ir/BekAa+NgOM97HH2VmN2Ir?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: ef98c44e-8581-478e-edfe-08d97ddda90c X-MS-Exchange-CrossTenant-AuthSource: CO6PR12MB5427.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Sep 2021 15:28:43.0283 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 3iqpzp+PAAu5jR72l6RdynqqfOxZGgwR5DBa9DaNy3Go3ItNswkAcW5OD4KRf7haEjtpK/n9Q4Vrxi6c6ZK+Og== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR12MB5428 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On 2021-09-22 04:31, Pekka Paalanen wrote: > On Tue, 21 Sep 2021 14:05:05 -0400 > Harry Wentland wrote: > >> On 2021-09-21 09:31, Pekka Paalanen wrote: >>> On Mon, 20 Sep 2021 20:14:50 -0400 >>> Harry Wentland wrote: >>> ... > >> Did anybody start any CM doc patches in Weston or Wayland yet? > > There is the > https://gitlab.freedesktop.org/swick/wayland-protocols/-/blob/color/unstable/color-management/color.rst > we started a long time ago, and have not really touched it for a while. > Since we last touched it, at least my understanding has developed > somewhat. > > It is linked from the overview in > https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/14 > and if you want to propose changes, the way to do it is file a MR in > https://gitlab.freedesktop.org/swick/wayland-protocols/-/merge_requests > against the 'color' branch. Patches very much welcome, that doc does > not need to limit itself to Wayland. :-) > Right, I've read all that a while back. It might be a good place to consolidate most of the Linux CM/HDR discussion, since gitlab is good with allowing discussions, we can track changes, and it's more formatting and diagram friendly than text-only email. > We also have issues tracked at > https://gitlab.freedesktop.org/swick/wayland-protocols/-/issues?scope=all&utf8=%E2%9C%93&state=opened > >>> Pre-curve for instance could be a combination of decoding to linear >>> light and a shaper for the 3D LUT coming next. That's why we don't call >>> them gamma or EOTF, that would be too limiting. >>> >>> (Using a shaper may help to keep the 3D LUT size reasonable - I suppose >>> very much like those multi-segmented LUTs.) >>> >> >> AFAIU a 3D LUTs will need a shaper as they don't have enough precision. >> But that's going deeper into color theory than I understand. Vitaly would >> know better all the details around 3D LUT usage. > > There is a very practical problem: the sheer number of elements in a 3D > LUT grows to the power of three. So you can't have very many taps per > channel without storage requirements blowing up. Each element needs to > be a 3-channel value, too. And then 8 bits is not enough. > And those storage requirements would have a direct impact on silicon real estate and therefore the price and power usage of the HW. Harry > I'm really happy that Vitaly is working with us on Weston and Wayland. :-) > He's a huge help, and I feel like I'm currently the one slowing things > down by being backlogged in reviews. > > > Thanks, > pq >