[{"id":37178,"web_url":"https://patchwork.libcamera.org/comment/37178/","msgid":"<53ca89dc-4924-440b-9f03-cff3d01962b9@oss.qualcomm.com>","date":"2025-12-03T10:20:57","subject":"Re: [PATCH v6 22/24] libcamera: software_isp: lut: Change default\n\tGamma to 1.0/2.2","submitter":{"id":242,"url":"https://patchwork.libcamera.org/api/people/242/","name":"Hans de Goede","email":"johannes.goede@oss.qualcomm.com"},"content":"Hi,\n\nOn 2-Dec-25 2:45 PM, Bryan O'Donoghue wrote:\n> Change the default softisp Gamma from 0.5 to 1.0/2.2.\n> \n> Signed-off-by: Bryan O'Donoghue \n\nThanks this indeed is a better default since monitors have\na default gamma of 2.2 (and this compensates for that):\n\nReviewed-by: Hans de Goede \n\nRegards,\n\nHans\n\n\n\n> ---\n> src/ipa/simple/algorithms/lut.cpp | 2 +-\n> 1 file changed, 1 insertion(+), 1 deletion(-)\n> \n> diff --git a/src/ipa/simple/algorithms/lut.cpp b/src/ipa/simple/algorithms/lut.cpp\n> index 9aaab54f1..7f223e812 100644\n> --- a/src/ipa/simple/algorithms/lut.cpp\n> +++ b/src/ipa/simple/algorithms/lut.cpp\n> @@ -35,7 +35,7 @@ int Lut::configure(IPAContext &context,\n> \t\t [[maybe_unused]] const IPAConfigInfo &configInfo)\n> {\n> \t/* Gamma value is fixed */\n> -\tcontext.configuration.gamma = 0.5;\n> +\tcontext.configuration.gamma = 1.0/2.2;\n> \tcontext.activeState.knobs.contrast = std::optional();\n> \tupdateGammaTable(context);\n>","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 7F988C3257\n\tfor ;\n\tWed, 3 Dec 2025 10:21:05 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 92CA860F34;\n\tWed, 3 Dec 2025 11:21:04 +0100 (CET)","from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com\n\t[205.220.168.131])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 926B4606A0\n\tfor ;\n\tWed, 3 Dec 2025 11:21:03 +0100 (CET)","from pps.filterd (m0279864.ppops.net [127.0.0.1])\n\tby mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id\n\t5B33nQ4x3192715 for ;\n\tWed, 3 Dec 2025 10:21:01 GMT","from mail-qk1-f200.google.com (mail-qk1-f200.google.com\n\t[209.85.222.200])\n\tby mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4at3qjjy2p-1\n\t(version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT)\n\tfor ;\n\tWed, 03 Dec 2025 10:21:01 +0000 (GMT)","by mail-qk1-f200.google.com with SMTP id\n\taf79cd13be357-8b244ef3ed4so526217785a.0\n\tfor ;\n\tWed, 03 Dec 2025 02:21:01 -0800 (PST)","from ?IPV6:2001:1c00:c32:7800:5bfa:a036:83f0:f9ec?\n\t(2001-1c00-0c32-7800-5bfa-a036-83f0-f9ec.cable.dynamic.v6.ziggo.nl.\n\t[2001:1c00:c32:7800:5bfa:a036:83f0:f9ec])\n\tby smtp.gmail.com with ESMTPSA id\n\t4fb4d7f45d1cf-64751035d4csm17619034a12.21.2025.12.03.02.20.58\n\t(version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128);\n\tWed, 03 Dec 2025 02:20:59 -0800 (PST)"],"Authentication-Results":"lancelot.ideasonboard.com; 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\n\tWed, 03 Dec 2025 02:21:00 -0800 (PST)","by 2002:a05:620a:4548:b0:8b2:f191:2b3a with SMTP id\n\taf79cd13be357-8b5e6c9253dmr213743285a.53.1764757260172; \n\tWed, 03 Dec 2025 02:21:00 -0800 (PST)"],"X-Google-Smtp-Source":"AGHT+IEGJjevP3QDM0TkFLslF9zQ1+1HTV05JhkfN90LSBztc1srTdE4qzEjYPR6RPQuUTIScppekw==","Message-ID":"<53ca89dc-4924-440b-9f03-cff3d01962b9@oss.qualcomm.com>","Date":"Wed, 3 Dec 2025 11:20:57 +0100","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","From":"johannes.goede@oss.qualcomm.com","Subject":"Re: [PATCH v6 22/24] libcamera: software_isp: lut: Change default\n\tGamma to 1.0/2.2","To":"Bryan O'Donoghue ,\n\tlibcamera-devel@lists.libcamera.org","Cc":"pavel@ucw.cz","References":"<20251202134544.662446-1-bryan.odonoghue@linaro.org>\n\t<20251202134544.662446-23-bryan.odonoghue@linaro.org>","Content-Language":"en-US, nl","In-Reply-To":"<20251202134544.662446-23-bryan.odonoghue@linaro.org>","Content-Type":"text/plain; charset=UTF-8","Content-Transfer-Encoding":"7bit","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjUxMjAzMDA4MiBTYWx0ZWRfX/YwZi1Nv6HqU\n\t+lHDdL9EjN8yiL2yUSEuHR6lVRQr3gxCk+JsOeNpuJKb80PfoAihvaWtxAOJKeHsDj6k/J/q3TW\n\tTc38e2r20EmkON0CcpiH0+iJtx9Yc6SGUdb2LiVv1A7NR5eThTB2rocxYIL+rS1NWAZmBYGEZ4z\n\t8zYnCXGsx0tKEXgQtHHfMdemUIqthu3vs34mbZ6JLHml5HAlb9W5dvqmCyHtlJPBDGS4mRh99nh\n\tC77uDqa8mni/DiXl0wUtEJaY16FnHKb7uhjL88NjNDNFoAmJUwpNT5WzjKgl2le6FVJrjG3qCFU\n\t96aQFgSvjMvAii/zuxvrRFL4gM0ocvODjH0v9oSWlVPyBY7uEpJ+2s5quuqzcAV9n3ClBg0kQ5l\n\tH4FeXPHHA00D1Pv8dn28pwHPNcQyTw==","X-Proofpoint-ORIG-GUID":"JP2JkinOdwUK13ezNu7HQU4bOXGQBGxV","X-Authority-Analysis":"v=2.4 cv=QohTHFyd c=1 sm=1 tr=0 ts=69300f0d cx=c_pps\n\ta=hnmNkyzTK/kJ09Xio7VxxA==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10\n\ta=wP3pNCr1ah4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22\n\ta=KKAkSRfTAAAA:8 a=EUspDBNiAAAA:8 a=wrkWtEBN1BhGSkzi3uAA:9\n\ta=QEXdDO2ut3YA:10\n\ta=PEH46H7Ffwr30OY-TuGO:22 a=cvBusfyB2V15izCimMoJ:22","X-Proofpoint-GUID":"JP2JkinOdwUK13ezNu7HQU4bOXGQBGxV","X-Proofpoint-Virus-Version":"vendor=baseguard\n\tengine=ICAP:2.0.293, Aquarius:18.0.1121, Hydra:6.1.9,\n\tFMLib:17.12.100.49\n\tdefinitions=2025-12-02_01,2025-11-27_02,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n\tlowpriorityscore=0 impostorscore=0 malwarescore=0 adultscore=0\n\tsuspectscore=0\n\tbulkscore=0 clxscore=1015 priorityscore=1501 phishscore=0 spamscore=0\n\tclassifier=typeunknown authscore=0 authtc= authcc= route=outbound\n\tadjust=0\n\treason=mlx scancount=1 engine=8.22.0-2510240001\n\tdefinitions=main-2512030082","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":37207,"web_url":"https://patchwork.libcamera.org/comment/37207/","msgid":"<85qztbz2ub.fsf@mzamazal-thinkpadp1gen7.tpbc.csb>","date":"2025-12-03T21:13:00","subject":"Re: [PATCH v6 22/24] libcamera: software_isp: lut: Change default\n\tGamma to 1.0/2.2","submitter":{"id":177,"url":"https://patchwork.libcamera.org/api/people/177/","name":"Milan Zamazal","email":"mzamazal@redhat.com"},"content":"Bryan O'Donoghue writes:\n\n> Change the default softisp Gamma from 0.5 to 1.0/2.2.\n>\n> Signed-off-by: Bryan O'Donoghue \n\nReviewed-by: Milan Zamazal \n\n> ---\n> src/ipa/simple/algorithms/lut.cpp | 2 +-\n> 1 file changed, 1 insertion(+), 1 deletion(-)\n>\n> diff --git a/src/ipa/simple/algorithms/lut.cpp b/src/ipa/simple/algorithms/lut.cpp\n> index 9aaab54f1..7f223e812 100644\n> --- a/src/ipa/simple/algorithms/lut.cpp\n> +++ b/src/ipa/simple/algorithms/lut.cpp\n> @@ -35,7 +35,7 @@ int Lut::configure(IPAContext &context,\n> \t\t [[maybe_unused]] const IPAConfigInfo &configInfo)\n> {\n> \t/* Gamma value is fixed */\n> -\tcontext.configuration.gamma = 0.5;\n> +\tcontext.configuration.gamma = 1.0/2.2;\n> \tcontext.activeState.knobs.contrast = std::optional();\n> \tupdateGammaTable(context);","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id CF70FBD80A\n\tfor ;\n\tWed, 3 Dec 2025 21:13:07 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 83233610A2;\n\tWed, 3 Dec 2025 22:13:07 +0100 (CET)","from us-smtp-delivery-124.mimecast.com\n\t(us-smtp-delivery-124.mimecast.com [170.10.133.124])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id B5FC9609D8\n\tfor ;\n\tWed, 3 Dec 2025 22:13:06 +0100 (CET)","from mail-wm1-f72.google.com (mail-wm1-f72.google.com\n\t[209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS\n\t(version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id\n\tus-mta-212-0A-rdR86Nn-MkiIuaEwolA-1; 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