The Locus Filter

Rada Deeb; Graham D. Finlayson

The Locus Filter

Research output: Contribution to conference › Paper › peer-review

Abstract

We study the design of a particular filter for digital photography, that we call the Locus Filter. It is built in a way that guarantees that the light in the scene after applying the filter stays on the Planckian locus. In this paper we provide a physical basis for designing such a filter based on the Wien approximation of Planck’s law. While locus filtered Planckian lights are on the locus, the amount they shift depends both on the locus filter and the colour temperature of the light. In experiments we show that real lights shift more or less as if they were Planckian in terms of the changes in their correlated colour temperatures.

Original language	English
Publication status	Published - 2021
Event	The Congress of the International Color Association : AIC 14th Congress Milano 2021 - Milano, Italy Duration: 30 Aug 2021 → … Conference number: 14

Conference

Conference	The Congress of the International Color Association
Abbreviated title	AIC
Country/Territory	Italy
City	Milano
Period	30/08/21 → …

Keywords

Filter design
Colour temperature
Wien approximation
Planckian locus

Cite this

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title = "The Locus Filter",

abstract = "We study the design of a particular filter for digital photography, that we call the Locus Filter. It is built in a way that guarantees that the light in the scene after applying the filter stays on the Planckian locus. In this paper we provide a physical basis for designing such a filter based on the Wien approximation of Planck{\textquoteright}s law. While locus filtered Planckian lights are on the locus, the amount they shift depends both on the locus filter and the colour temperature of the light. In experiments we show that real lights shift more or less as if they were Planckian in terms of the changes in their correlated colour temperatures.",

keywords = "Filter design, Colour temperature, Wien approximation, Planckian locus",

author = "Rada Deeb and Finlayson, {Graham D.}",

year = "2021",

language = "English",

note = "The Congress of the International Color Association : AIC 14th Congress Milano 2021, AIC ; Conference date: 30-08-2021",

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AU - Deeb, Rada

AU - Finlayson, Graham D.

N1 - Conference code: 14

PY - 2021

Y1 - 2021

N2 - We study the design of a particular filter for digital photography, that we call the Locus Filter. It is built in a way that guarantees that the light in the scene after applying the filter stays on the Planckian locus. In this paper we provide a physical basis for designing such a filter based on the Wien approximation of Planck’s law. While locus filtered Planckian lights are on the locus, the amount they shift depends both on the locus filter and the colour temperature of the light. In experiments we show that real lights shift more or less as if they were Planckian in terms of the changes in their correlated colour temperatures.

AB - We study the design of a particular filter for digital photography, that we call the Locus Filter. It is built in a way that guarantees that the light in the scene after applying the filter stays on the Planckian locus. In this paper we provide a physical basis for designing such a filter based on the Wien approximation of Planck’s law. While locus filtered Planckian lights are on the locus, the amount they shift depends both on the locus filter and the colour temperature of the light. In experiments we show that real lights shift more or less as if they were Planckian in terms of the changes in their correlated colour temperatures.

KW - Filter design

KW - Colour temperature

KW - Wien approximation

KW - Planckian locus

M3 - Paper

T2 - The Congress of the International Color Association

Y2 - 30 August 2021

ER -