231001 'HAND' http://farbe.li.tu-berlin.de/eea_s46.htm or
http://color.li.tu-berlin.de/eea_s46.htm.
Project title: Colour and colour vision with Ostwald, device, and elementary colours -
Antagonistic colour-vision models TUBJND and TUBLAB, and properties for many applications
Chapter E: Colour Metrics, Differences, and Appearance (2023),
Main part eea_s, under work
Titles and links to six different topics (all under work in 2023)
Title of part 4.1: Achromatic colour metric for the surface colour range for adjacent (a) and separated (s) samples
eea_s41 in English or
ega_s41 in German.
Title of part 4.2: Achromatic and chromatic colour metric for the surface colour range
eea_s42 in English or
ega_s42 in German.
Title of part 4.3: Achromatic colour metric for a wide luminance range between the
Low, Standard and High Dynamic Range (LDR, SDR, and HDR)
eea_s43 in English or
ega_s43 in German.
Title of part 4.4: Achromatic and chromatic colour metric for a wide luminance range between the Low, Standard and High Dynamic Range (LDR, SDR, and HDR)
eea_s44 in English or
ega_s44 in German.
Title of part 4.5: Research results and connections of special CIE and TUB colourimetries
eea_s45 in English or
ega_s45 in German.
Title of part 4.6: Research results on the colour appearance attribute colourfullness
eea_s46 in English or
ega_s46 in German.
For links to the main chapter E
Colour Metrics, Differences, and Appearance (2023),
under work, see
Content list of chapter E (links and file names use small letters):
eea_s in English or
ega_s in German.
_________________________
Title of part 4.6: Research results on the colour appearance attribute colourfullness
4.61. Introduction.
4.62: Relations of experimental data of Evans on colour appearance and the TUBLAB colour space.
The book of Evans on colour appearance (1973) includes many results on colours of cero greyess for achromatic and chormatic surrounds. A colorimetric model for the descriptions of his experimental results is mostly unknown.
Figure 4.62-1: Tristimulus value Yo as function of the hue angle hAB,2o of the Ostwald colours (o)
For the download of this figure in the VG-PDF format, see
eeu00-1n.pdf.
The Yo function is shown as function of the dominant wavelength in Fig. 4.62-2.
Figure 4.62-2: Tristimulus value Yo as function of the dominant wavelength lambdado of the Ostwald colours
For the download of this figure in the VG-PDF format, see
eea10-5n.pdf.
The output as function of the domiant wavelength looks very similar compared to the tristimulus value of cero greyness of the experimental results of Evans and Swenhold.
The crosses are the caculated data of the Ostwald optimal colours and are not the Go-data of Evans and Swenhold. A paper of Richter (1971) has tried to describe the Evans and Swenhold results and many others on colour appearance, see
Richter, K. (1971), Description of colour attributes and colour differences, in Proceedings of the Helmholtz Memorial Symposium on Color Metrics, AIC/Holloand, Soesterberg, p.134-146, see
http://farbe.li.tu-berlin.de/richter-aic-1971.pdf or see
https://aic-color.org/publications,
go to AIC 1971 to download the above paper of Richter, and related papers, for example of:
Valberg, A. (1971), Similarity between JND-curves for complemantary optimal colours, AIC proceeding.
Stiles, W.S. (1971), The line elenment in colour theory, A historical review, AIC proceeding.
Guth, S.L. (1971), A new color model, AIC proceedings.
Figure 4.62-3: Contrast shift and reduction for 5 colours WYGRB
For the download of this figure in the VG-PDF format, see
ees90-2a.pdf.
Figure 4.62-4: Contrast shift for for 5 colours WYGRB
For the download of this figure in the VG-PDF format, see
ees90-2b.pdf.
An improved desciption which considers the above papers of 1971 is under work
4.63: Different accuracy for the colour atributes lightness L* based on visual assessment and based on just noticeable differences (JNDs).
4.64. Relations between the relative lightness L*/L*u and the relative luminance L/Lu in the colour space CIELABs for separated colours (s).
4.65: Main colour attributes relative lightness L*/L*u and relative contrast (L/dL)/(L/dL)u for the achromatic surface-colour range.
_________________________
For links to the main chapter E
Colour Metrics, Differences, and Appearance (2023),
under work.
Content list of chapter E (links and file names use small letters), see
eea_s in English or
ega_s in German.
This web page is since 2023 under work.
In future the figures and the text may be improved.
Link to the first topic (under work in 2023)
Title of part 4.1: Achromatic colour metric for the surface colour range for adjacent (a) and separated (s) samples
eea_s41 in English or
ega_s41 in German.
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For the TUB start site (not archive), see
index.html in English, or
indexDE.html in German.
For the TUB archive site (2000-2009) of the BAM server
"www.ps.bam.de" (2000-2018)
about colour test charts, colorimetric calculations, standards,
and publications, see
indexAE.html in English,
indexAG.html in German.
For similar Information of the BAM server "www.ps.bam.de"
from the WBM server (WayBackMachine)
https://web.archive.org/web/20090402212108/http://www.ps.bam.de/index.html