WetCanvas
Home Member Services Content Areas Tools Info Center WC Partners Shop Help
Channels:
Search for:
in:

Welcome to the WetCanvas forums. You are currently viewing our boards as a guest which gives you limited access to view most discussions, articles and access our other FREE features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload your own photos and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please visit our help center.

Go Back   WetCanvas > The Learning Center > Color Theory and Mixing
User Name
Password
Register Mark Forums Read

Salute to our Partners
WC! Sponsors

Our Sponsors
Reply  
 
Thread Tools Display Modes
  #1   Report Bad Post  
Old 04-20-2019, 09:17 PM
Googlies Googlies is offline
New Member
 
Join Date: Mar 2003
Posts: 14
 
Hails from Mexico
Question Pigment with peak in yellow of the spectrum?

Hi all.

I'm looking for a pigment with a peak in the yellow part of the visible spectrum. I was hoping maybe someone super technical knowledge would know here, maybe?

Handprint handily has the spectrums of a lot of pigments on their website. Just click the little rainbow icon by a color: https://www.handprint.com/HP/WCL/watery.html

From their spectrums, it looks like most yellow pigments reflect reflect a large band of light from red all the way to green for some.

The closest I could find to having a 'peak' in the yellow is PY42: https://www.handprint.com/HP/WCL/waterfs.html

Maybe there's a less common pigment that is like that? Thanks.
Reply With Quote
  #2   Report Bad Post  
Old 04-21-2019, 08:32 AM
Patrick1's Avatar
Patrick1 Patrick1 is offline
A WetCanvas! Patron Saint
Canada
 
Join Date: Mar 2001
Posts: 3,777
 
Hails from Canada
Re: Pigment with peak in yellow of the spectrum?

Looking around at the spectral profiles, yellow seems to be the one color region where pigments don't have a peak. If you do find any, I'd be interested too. Photography and theater lighting filters, otoh, do have some filters that are more narrowband/peaky than artist pigments.
__________________
Color is the most important element in painting - except for everything else
Reply With Quote
  #3   Report Bad Post  
Old 04-21-2019, 02:12 PM
savras's Avatar
savras savras is offline
Senior Member
 
Join Date: Sep 2012
Posts: 286
 
Hails from Poland
Re: Pigment with peak in yellow of the spectrum?

Quote:
Originally Posted by Googlies
I'm looking for a pigment with a peak in the yellow part of the visible spectrum.

I'd like to know what would be the point of it. If I understand correctly, how reflectance curves work, then such pigment would work as a filter cutting out anything apart from yellow part of the spectrum.
Thus resulting in either neutralized yellows/greens or something close to grey.

Last edited by savras : 04-21-2019 at 02:14 PM.
Reply With Quote
  #4   Report Bad Post  
Old 04-21-2019, 03:40 PM
WFMartin's Avatar
WFMartin WFMartin is offline
A WC! Legend
Glendale, Arizona
 
Join Date: Sep 2002
Posts: 11,551
 
Hails from United States
Re: Pigment with peak in yellow of the spectrum?

It has been estimated that roughly only 7% of the color, "yellow", that we see emanating from everyday objects is actually Spectral Yellow (which would be represented by this "peak" to which you are referring). The other 93% of the color, Yellow, that we see is reflected Red, and Green light.

This is one reason that spectral emission curves prove to be rather meaningless, and useless for judging colors that occur in everyday situations, such as painting. For example, the color, Magenta, is represented by equal emissions (or reflectance) of both the Blue, and the Red portions of the spectrum. In fact, because those two colors occur at the opposite ends of the spectrum, there can't possibly any such "peak" in the Magenta portion of the spectrum, simply because there is no single, "Magenta wavelength" in the natural spectrum. If you doubt this fact, merely Google "Spectral Magenta", and you may be surprised to learn that there is no such thing.

If you wish to actually view a color that represents "spectral Yellow" in as pure a form as one can get, purchase a Kodak Wratten Filter #90, and take a look at it. True, spectral yellow is not a very pleasing color, at all, and is not a color that an artist would likely consider being a representative "Yellow". It is sort a copper-y, bronze-y appearing color that one would not consider as being "Yellow" at all. However, just look at the spectral curve of this #90 filter, and you will discover that it is a quite accurate example of Spectral Yellow.

Again, this is another reason that spectral emission curves are not always a very logical way of expressing a color, unless one understands the more scientific facts of vision behind them. For example, if I were to be judging the "Yellow-ness" of a color, I'd be examining the spectral curve emissions of the Red, and Green colors, because it is THOSE that truly indicate the hue of the color, Yellow, that we will be witnessing.
__________________
wfmartin. My Blog "Creative Realism"...www.williamfmartin.blogspot.com .

Last edited by WFMartin : 04-21-2019 at 03:49 PM.
Reply With Quote
  #5   Report Bad Post  
Old 04-21-2019, 06:47 PM
Patrick1's Avatar
Patrick1 Patrick1 is offline
A WetCanvas! Patron Saint
Canada
 
Join Date: Mar 2001
Posts: 3,777
 
Hails from Canada
Re: Pigment with peak in yellow of the spectrum?

Folks - the original poster never asked about it being a 'good' yellow for painting or color mixing, so there is no reason to assume they are clueless about how spectral profiles translate to perceived color - especially after referencing one of the best color theory sites on the planet.

The question might've been asked merely out of curiosity, or to do some color experiment. Narrowband color filters have unusual mixing properties, maybe he/she was hoping something similar exists in artist pigments - which afaik doesn't, at least for yellows. If the question is asking about yellows with a very gentle peak, a few yellows might do that, kinda sorta:
Attached Images
   
__________________
Color is the most important element in painting - except for everything else
Reply With Quote
  #6   Report Bad Post  
Old 04-22-2019, 05:22 AM
tiago.dagostini tiago.dagostini is offline
Enthusiast
 
Join Date: Jun 2009
Posts: 1,551
 
Hails from Brazil
Re: Pigment with peak in yellow of the spectrum?

The simple reason for that is statistics.. what we call yellow is a very very narrow band .. so statistically it is a much smaller probability of finding a pigment centered on it other than anywhere else in the spectrum.
__________________
"no no! You are doing it all wrong, in the internet we are supposed to be stubborn, inflexible and arrogant. One cannot simply be suddenly reasonable and reflexive in the internet, that breaks years of internet tradition as a medium of anger, arrogance, bigotry and self entitlement. Damm these internet newcomers being nice to to others!!!"

"If brute force does not solve your problem, then you are not using enough!"
Reply With Quote
  #7   Report Bad Post  
Old 04-22-2019, 12:11 PM
Googlies Googlies is offline
New Member
 
Join Date: Mar 2003
Posts: 14
 
Hails from Mexico
Re: Pigment with peak in yellow of the spectrum?

Quote:
Originally Posted by Patrick1
Folks - the original poster never asked about it being a 'good' yellow for painting or color mixing, so there is no reason to assume they are clueless about how spectral profiles translate to perceived color - especially after referencing one of the best color theory sites on the planet.

The question might've been asked merely out of curiosity, or to do some color experiment. Narrowband color filters have unusual mixing properties, maybe he/she was hoping something similar exists in artist pigments - which afaik doesn't, at least for yellows. If the question is asking about yellows with a very gentle peak, a few yellows might do that, kinda sorta:

Thanks 🍻
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 06:06 AM.


© 2014 F+W All rights reserved.