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échelle d'étude
sensible
Sep 9, 2011 09:17
12 yrs ago
4 viewers *
French term

triangle de désaturation

French to English Science Science (general) Colours
CONTEXT:

"Un axe vertical noir blanc, appelé échelle des gris, représente les tons neutres. Toute droite perpendiculaire à cet axe présente des tons isophanes (de même clarté). Toute droite parallèle à cet axe vertical noir blanc affiche des tons isosaturés (d'égale saturation). Les échantillons de laine nouvellement codés sont présentés sur chaque page de tonalité en un triangle de désaturation où chaque ton pur de 100% de chroma est placé au niveau du gris d'égale luminosité."

http://perso.ensad.fr/~longa/Nimes1.html

No Google hits whatsoever for "desaturation triangle". What can it be? TIA.
Proposed translations (English)
4 +2 desaturation triangle
3 +1 saturation triangle
3 -1 chromacity diagram

Discussion

Tony M Sep 12, 2011:
@ Marian Not quite, Marian!

In colorimetry, we don't speak of 'clarity' (ambiguous for transparency), but rather of 'brightness', 'lightness', or 'luminance'.
Marian Vieyra Sep 12, 2011:
Iso- A Greek prefix meaning "same".
tons isosaturés = same level of saturation
tons isophanes = same level of clarity
liz askew Sep 9, 2011:
I suppose " of equal saturation"?
liz askew Sep 9, 2011:
Hi, how have you translated (d'égale saturation)?

Proposed translations

+2
1 hr
Selected

desaturation triangle

where had the "de" gone

Routledge Technical: désaturation = desaturation
Peer comment(s):
neutral Nikki Scott-Despaigne : I have not found any trace of the existence of a DEsaturation trianlge. It looks very much like a typo or an invented term! If you have references then I'd be happy to stand corrected. // Desaturation exists, but I find nothing on "desaturation triangle".
15 mins
As above the Routledge Technical, and the Shorter Oxford Dictionaries both show the word Desaturation
agree Marian Vieyra : desaturation (diːˌsætʃəˈreɪʃən) — n physics the addition of white light to a pure colour to produce a paler less saturated colour
2 days 22 hrs
agree Tony M : I think it is probably an invented term, but a perfectly valid and comprehensible one
2 days 22 hrs
Something went wrong...
4 KudoZ points awarded for this answer. Comment: "Thx."
-1
5 hrs

chromacity diagram

Not an expert, but have a look at the two refs It looks as though it's this.
Reference:

http://physiquelumiere.canalblog.com/archives/2010/10/22/19337885.html

http://www.ecse.rpi.edu/~schubert/Light-Emitting-Diodes-dot-org/chap17/chap17.htm

Peer comment(s):
disagree Tony M : It should be 'chromaticity', but in any case, I'm afraid this term is (properly, at any rate!) used to refer to something very specific, not quite the same as is being described here.
2 days 18 hrs
Something went wrong...
+1
18 mins

saturation triangle

my bet is that this is a typo, however I have not translated your entire text, but you should be able to judge from the general context

http://cwcaribbean.aoml.noaa.gov/bilko/intro3.html

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Note added at 1 hr (2011-09-09 10:23:31 GMT)
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or
incorporate

in descending order

HSL Color Schemer - color scheme by HSL to HEX color palette ...
www.workwithcolor.com/hsl-color-schemer-01.htm
Calculates hue values in ascending order from the chosen color by input distance. ... Calculates saturation values for the chosen color in descending order by ...

sorry
have no more time for this one!

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Note added at 3 days20 mins (2011-09-12 09:37:51 GMT)
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something else

Colorfulness - Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Colorfulness - Cached
In colorimetry and color theory, colorfulness, chroma, and saturation are related but distinct ... To desaturate a color of given intensity in a subtractive system (such as watercolor), one can add white, .... The Focal Encyclopedia of Photography. ...

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Note added at 3 days22 mins (2011-09-12 09:39:39 GMT)
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http://www.optics4kids.org/Home/TeachersParents/Articles/The...
Peer comment(s):
neutral Tony M : I don't think for a moment that it's a typo, it's just that they seem to have a special way of looking at it; note that it starts from 100% saturation, and so must go down from there, hence why 'desaturation' is logical (if not widespread!)
8 mins
OK! hadn't really looked at that. So "desaturation triangle", particularly if "saturation triangle" exists.
agree Nikki Scott-Despaigne : I would tend to agree with Liz here. Cf. http://en.wikipedia.org/wiki/HSL_and_HSV at "basic Principles", ref decrease in saturation. Check with client whether a typo "triangle DE saturation", a neologism ("désaturation") or if they mean decrease in sat°.
1 hr
Thank you! My response was evidence-based, what else can I do ?
Something went wrong...
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