[{"id":29565,"web_url":"https://patchwork.libcamera.org/comment/29565/","msgid":"","date":"2024-05-20T10:54:54","subject":"Re: [PATCH 2/3] libcamera: Add gamma control id","submitter":{"id":156,"url":"https://patchwork.libcamera.org/api/people/156/","name":"Dan Scally","email":"dan.scally@ideasonboard.com"},"content":"Hi Stefan\n\nOn 16/05/2024 13:41, Stefan Klug wrote:\n> A camera gamma of roughly 2.2 is necessary to produce correct output\n> images on a standard monitor. Add a control for that.\n>\n> Further information is available here:\n> https://en.wikipedia.org/wiki/SRGB\n> https://www.cambridgeincolour.com/tutorials/gamma-correction.htm\n>\n> Signed-off-by: Stefan Klug \n> ---\n> src/libcamera/control_ids_core.yaml | 6 ++++++\n> 1 file changed, 6 insertions(+)\n>\n> diff --git a/src/libcamera/control_ids_core.yaml b/src/libcamera/control_ids_core.yaml\n> index bf1f1a83..43b85135 100644\n> --- a/src/libcamera/control_ids_core.yaml\n> +++ b/src/libcamera/control_ids_core.yaml\n> @@ -243,6 +243,12 @@ controls:\n> Specify a fixed contrast parameter. Normal contrast is given by the\n> value 1.0; larger values produce images with more contrast.\n> \n> + - Gamma:\n> + type: float\n> + description: |\n> + Specify a fixed gamma value. Default is 2.2 which closely mimics sRGB\n> + gamma. Note that this is camera gamma, so it is applied as 1.0/gamma\n\nI think I would word it as  \"Default must be 2.2\" rather than \"is\"...purely on the grounds that the \nIPA module could have any default value that slips past review. But either way:\n\n\nReviewed-by: Daniel Scally \n\n> +\n> - Lux:\n> type: float\n> description: |","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 BC443BDE6B\n\tfor ;\n\tMon, 20 May 2024 10:54:59 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 4FEF36347F;\n\tMon, 20 May 2024 12:54:59 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 3B24461A58\n\tfor ;\n\tMon, 20 May 2024 12:54:57 +0200 (CEST)","from [192.168.0.43]\n\t(cpc141996-chfd3-2-0-cust928.12-3.cable.virginm.net [86.13.91.161])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 18DB9581\n\tfor ;\n\tMon, 20 May 2024 12:54:45 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com; 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