From owner-freebsd-questions@freebsd.org Wed Dec 30 15:05:14 2015 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1BC09A55B05 for ; Wed, 30 Dec 2015 15:05:14 +0000 (UTC) (envelope-from ralf.mardorf@rocketmail.com) Received: from nm37.bullet.mail.ir2.yahoo.com (nm37.bullet.mail.ir2.yahoo.com [212.82.96.62]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 611C81BF7 for ; Wed, 30 Dec 2015 15:05:12 +0000 (UTC) (envelope-from ralf.mardorf@rocketmail.com) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rocketmail.com; s=s2048; t=1451487733; bh=tSYJx8uZBa0fqoYpJ4bybnFrA8PO3guue3QhrgkaYpk=; h=Date:From:To:Subject:In-Reply-To:References:From:Subject; b=cetA0105isjJJTUhVHVCc4V5IK7PwAlMfJiwLFaNHPTpZaA+W19IjiTGf3+ZLVO5qstz4QRedvg+RaZ6sAQOqUY0mMDSdLgi2QHa1pl2fr1ycXpiP94fEYLgBLEccqa9HcL8jyg7O4rNQTNTu0AUdAshfoOT9yP9utjH77p4RCQug2kv0uHwUHNc1d9rIfIacgSBIroqqSqsGkYT4HViDyCGg1Blbqx0tNTquAiKuGOK9D0aDO7IRkGxHsPJF3DcImV7b6BVLMZC3fXMtitts5rFRciZErKXg60XwFr0NR+zOJbLFb/BMC++Drh2PzJyIPP5PNQzV5frXfyTmtD+4A== Received: from [212.82.98.49] by nm37.bullet.mail.ir2.yahoo.com with NNFMP; 30 Dec 2015 15:02:13 -0000 Received: from [46.228.39.83] by tm2.bullet.mail.ir2.yahoo.com with NNFMP; 30 Dec 2015 15:02:13 -0000 Received: from [127.0.0.1] by smtp120.mail.ir2.yahoo.com with NNFMP; 30 Dec 2015 15:02:13 -0000 X-Yahoo-Newman-Id: 227547.53977.bm@smtp120.mail.ir2.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: 1_65kC4VM1mX1nbTxFSt6MzKkwX_0gNGqEs5_Ma.zVjerMc rOBMCWCkijusKCAQy3lapYhv8z6aUEYI_Avxnj45ya30MUCh6SOeQ_CQjWAf okbTomsN8brkDMKa1aN4i.JJVW42NmV0dEHcId76.Q2cZSe6MVS6H7Q1fYKe z0zQ7EpJa1hz4_keFAaVYQvkWXXi2i.LpUUjEn.4WD4CgyQ1K_deJ_BwLh4L e_c4etKShTy7Q0yPqs3O_wBxkgpDo6UwFP8LQI9t_hbP9WDpJhOQYw9A4ue4 s7rJjYhNHiif_PYbxStUVcGzi1vSv3tFBV3HAYxwuFmMe8uUpzY8IO73zoJ0 55nysyknvAv463M_C_pV1bIcnhp5m344sdlNrlg8ZZvwCrR.EHDaVhG5WBYn PVEFsvaFOW6VOu1bZvrqiYqhmtb58ldMqmPnM6JIA1Kh2SwvfrqeqUeU9LOq 8Fs98JY9Md_Ah1HPIuay.DUC8jsikB6n9sRLyF5GkujBhb5jc7uiaoAtMe_b 5rkYRDjSNOx0ubMaMUqe0Trcrnr3FgEFqn3EHgTWoR8Hs7323tcuMwPnYDc7 jFyBkBxin X-Yahoo-SMTP: BeMCPs2swBABTJ3kAeEiC_hE0mz8jRexLddJfD8pI2j32fOacjBmXg-- Date: Wed, 30 Dec 2015 16:02:12 +0100 From: Ralf Mardorf To: freebsd-questions@freebsd.org Subject: Re: [OT] Light frequency or wavelength to (eg RGB) colour Message-ID: <20151230160212.5d62af6f@archlinux.localdomain> In-Reply-To: <20151231012759.I8562@sola.nimnet.asn.au> References: <20151231012759.I8562@sola.nimnet.asn.au> X-Mailer: Claws Mail 3.13.1 (GTK+ 2.24.29; x86_64-arch-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Dec 2015 15:05:14 -0000 On Thu, 31 Dec 2015 01:36:38 +1100 (EST), Ian Smith wrote: >does anyone know of a method - preferably a formula - for converting >known frequencies (or complementarily, their wavelengths) within the >visible spectrum to its colour rendition in RGB, CMYK or whatever? I can't help you with your request. However, are you already aware that the first thing you need to do, assumed you want to see the true colours on your display, is to calibrate your display? To do this you need hardware, a colorimeter.