colour maps for the colour blind - peter kovesi · conclusions the colour maps are untested, but i...
TRANSCRIPT
![Page 1: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/1.jpg)
Colour Maps for the Colour Blind
Peter Kovesi
Centre for Exploration TargetingSchool of Earth and Environment
The University of Western Australia
IAMG2017
![Page 2: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/2.jpg)
protanopia
deuteranopia
tritanopia
![Page 3: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/3.jpg)
Protanopia/Protanomaly: Red,Lconesmissing/reducedfunc=on. Red-Greenblind.1-2%males.
Deuteranopia/Deuteranomaly:Green,Mconesmissing/reducedfunc=on.
Red-Greenblind.6-8%males.Tritanopia/Tritanomaly: Blue,Sconesmissing/reducedfunc=on.
Blue-Yellowblind.Veryrare.
![Page 4: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/4.jpg)
Testimageforcolourmaps:Asinewavesuperimposedonaramp
Agoodcolourmapwillrenderthesinewaveuniformlyacrosstheimage.
AmplitudeisreducedtozeroattheboMomoftheimage.
Amplitudeissetsothatpeaktotroughis10%ofthefulldatarange.
![Page 5: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/5.jpg)
ColourMapRoadTest
![Page 6: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/6.jpg)
Acolourmapisapaththroughcolourspace
![Page 7: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/7.jpg)
LightnessdifferencesdominatesperceptualcontrastatfinespaCalscales.
Labcolourspace
![Page 8: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/8.jpg)
TheColourMapDesignProcess
1)Defineacolourmappathusinglinesegmentsorsplines.
2)Ini=alcolourmap
3)Resamplecolourmappathatequallightnessstepstoobtainperceptualuniformity
![Page 9: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/9.jpg)
PerceptuallyUniformColourMaps
VendorColourMaps Featuresdisappearatpointsoflowperceptualcontrast
Falsefeaturesthatareinthecolourmap,notinyourdata
![Page 10: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/10.jpg)
tritanopia
protanopia
deuteranopia
Checkingtoseeifacolourmapis‘colourblindsafe’isnotopCmal
Colourmapdesignedsothatredandbluecoloursarematchedinlightnessandchroma.
![Page 11: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/11.jpg)
Idealapproachistodesigncolourmapswithinthecolourspaceofthecolourblind
• Ensuresmaximaluseofthecolourspace.
• Allowseveryonetoshareacommonperceptualinterpreta=onofthedata.
• Chromaandlightnesscanbeproperlyusedinthedesignofcolourmaps.
![Page 12: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/12.jpg)
575nmisperceivedassameyellowbytrichromats,protanopesanddeuteranopes
Protananpic/DeuteranopicColourSpace
475nmisperceivedassamebluebytrichromats,protanopesanddeuteranopes
• Assumethegreyscaleisperceivedinthesameway.
• Usingdatafrompeoplewhoarecolourblindinjustoneeyeassumethefollowing:
![Page 13: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/13.jpg)
575nmisperceivedassameyellowbytrichromats,protanopesanddeuteranopes
Protananpic/DeuteranopicColourSpace
475nmisperceivedassamebluebytrichromats,protanopesanddeuteranopes
• Assumethegreyscaleisperceivedinthesameway.
• Usingdatafrompeoplewhoarecolourblindinjustoneeyeassumethefollowing:
![Page 14: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/14.jpg)
Protananpic/DeuteranopicColourSpaceinLMSconeresponsecoordinates
ColourspaceinLMSconeresponsecoordinates
HansBreMel,FrancoiseVienotandJohnD.Mollon.1997“Computerizedsimula=onofcolorappearancefordichromats”
(adistor=onoftheRGBcube)
![Page 15: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/15.jpg)
Protanopicprojec=onofcoloursontocolourspace
Deuteranopicprojec=onofcoloursontocolourspace
![Page 16: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/16.jpg)
Protananpic/DeuteranopicColourSpaceinCIELabcoordinates
Fullcolourspace
![Page 17: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/17.jpg)
![Page 18: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/18.jpg)
![Page 19: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/19.jpg)
660nmisperceivedassameredbytrichromatsandtritanopes
TritanopicColourSpace
485nmisperceivedassameblue/greenbytrichromatsandtritanopes
![Page 20: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/20.jpg)
TritanopicColourSpaceinLMSconeresponsecoordinates
Tritanopicprojec=onofcoloursontocolourspace
![Page 21: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/21.jpg)
TritanopicColourSpaceinCIELabcoordinates
Fullcolourspace
![Page 22: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/22.jpg)
![Page 23: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/23.jpg)
Data:PropertyofFugroAirborneSurveysPtyLtdProcessing:PhasePreservingDynamicRangeCompression
![Page 24: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/24.jpg)
![Page 25: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/25.jpg)
divergingmaps
![Page 26: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/26.jpg)
![Page 27: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/27.jpg)
![Page 28: Colour Maps for the Colour Blind - Peter Kovesi · Conclusions The colour maps are untested, but I propose the following: • It is best to design colour maps within the colour space](https://reader033.vdocuments.site/reader033/viewer/2022041909/5e66b08d641e1509e1282f45/html5/thumbnails/28.jpg)
Conclusions
Thecolourmapsareuntested,butIproposethefollowing:• Itisbesttodesigncolourmapswithinthecolourspaceofthe
colourblind,ratherthantestamapforcolourblind‘safeness’.
• Workingwithinthecolourspaceofthecolourblindallowseveryonetoshareacommonperceptualinterpreta=onofthedata.
• Ensuresmaximaluseoftheavailablecolourspace.
• Chromaandlightnesscanbeproperlyusedinthedesignofcolourmaps.
Colourmapscanbedownloadedfrom:peterkovesi.com/projects/colourmaps