HSV system (numeric values) broken?

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I'm new to Blender and currently digging into the nodes system, trying to figure out what all of those nodes actually do (aside from the information one is given in various YT-tutorials).

I came across a very strange behaviour of HSV values when it comes to Separating/Adding/Combining.

It's all about Pink:

• RGB: 1 0 0.212


• HSV: 0.917 1 1

I ) I can set up this pink just in a diffuse shader inputting RGB and/or HSV values.

II) I also get to this pink by mixing blue and red using "Add Shader" or using "Mix RGB - Add)

Blue:

• RGB: 0.000 0.000 0.214


• HSV: 0.667 1.000 0.500

Red:

• RGB: 1.000 0.000 0.000


• HSV: 0.000 1.000 1.000

(Results are 100% conform with same Photoshop blending mode)

III) I also get to this pink by manually adding values in the RGB system:

RGB color values

• R: 0 + 1 = 1


• G: 0 + 0 = 0


• B: 0.214 - 0.002 = 0.212

IV) BUT: Manual adding of values does not work within the HSV-System!

HSV color values

• H: 0.667 + 0.250 = 0.917


• S: 1 + 0 = 1


• V: 0.5 + 0.5 = 1

The outcome should be the same Pink but IT IS NOT!
It's almost the same but a little darker.

Any ideas?

color

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up vote
1
down vote

favorite

I'm new to Blender and currently digging into the nodes system, trying to figure out what all of those nodes actually do (aside from the information one is given in various YT-tutorials).

I came across a very strange behaviour of HSV values when it comes to Separating/Adding/Combining.

It's all about Pink:

• RGB: 1 0 0.212


• HSV: 0.917 1 1

I ) I can set up this pink just in a diffuse shader inputting RGB and/or HSV values.

II) I also get to this pink by mixing blue and red using "Add Shader" or using "Mix RGB - Add)

Blue:

• RGB: 0.000 0.000 0.214


• HSV: 0.667 1.000 0.500

Red:

• RGB: 1.000 0.000 0.000


• HSV: 0.000 1.000 1.000

(Results are 100% conform with same Photoshop blending mode)

III) I also get to this pink by manually adding values in the RGB system:

RGB color values

• R: 0 + 1 = 1


• G: 0 + 0 = 0


• B: 0.214 - 0.002 = 0.212

IV) BUT: Manual adding of values does not work within the HSV-System!

HSV color values

• H: 0.667 + 0.250 = 0.917


• S: 1 + 0 = 1


• V: 0.5 + 0.5 = 1

The outcome should be the same Pink but IT IS NOT!
It's almost the same but a little darker.

Any ideas?

color

share|improve this question

edited 4 hours ago

asked 4 hours ago

bs7599

62

New contributor

bs7599 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

up vote
1
down vote

favorite

up vote
1
down vote

favorite

I'm new to Blender and currently digging into the nodes system, trying to figure out what all of those nodes actually do (aside from the information one is given in various YT-tutorials).

I came across a very strange behaviour of HSV values when it comes to Separating/Adding/Combining.

It's all about Pink:

• RGB: 1 0 0.212


• HSV: 0.917 1 1

I ) I can set up this pink just in a diffuse shader inputting RGB and/or HSV values.

II) I also get to this pink by mixing blue and red using "Add Shader" or using "Mix RGB - Add)

Blue:

• RGB: 0.000 0.000 0.214


• HSV: 0.667 1.000 0.500

Red:

• RGB: 1.000 0.000 0.000


• HSV: 0.000 1.000 1.000

(Results are 100% conform with same Photoshop blending mode)

III) I also get to this pink by manually adding values in the RGB system:

RGB color values

• R: 0 + 1 = 1


• G: 0 + 0 = 0


• B: 0.214 - 0.002 = 0.212

IV) BUT: Manual adding of values does not work within the HSV-System!

HSV color values

• H: 0.667 + 0.250 = 0.917


• S: 1 + 0 = 1


• V: 0.5 + 0.5 = 1

The outcome should be the same Pink but IT IS NOT!
It's almost the same but a little darker.

Any ideas?

color

share|improve this question

edited 4 hours ago

asked 4 hours ago

bs7599

62

New contributor

bs7599 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

I'm new to Blender and currently digging into the nodes system, trying to figure out what all of those nodes actually do (aside from the information one is given in various YT-tutorials).

I came across a very strange behaviour of HSV values when it comes to Separating/Adding/Combining.

It's all about Pink:

• RGB: 1 0 0.212


• HSV: 0.917 1 1

I ) I can set up this pink just in a diffuse shader inputting RGB and/or HSV values.

II) I also get to this pink by mixing blue and red using "Add Shader" or using "Mix RGB - Add)

Blue:

• RGB: 0.000 0.000 0.214


• HSV: 0.667 1.000 0.500

Red:

• RGB: 1.000 0.000 0.000


• HSV: 0.000 1.000 1.000

(Results are 100% conform with same Photoshop blending mode)

III) I also get to this pink by manually adding values in the RGB system:

RGB color values

• R: 0 + 1 = 1


• G: 0 + 0 = 0


• B: 0.214 - 0.002 = 0.212

IV) BUT: Manual adding of values does not work within the HSV-System!

HSV color values

• H: 0.667 + 0.250 = 0.917


• S: 1 + 0 = 1


• V: 0.5 + 0.5 = 1

The outcome should be the same Pink but IT IS NOT!
It's almost the same but a little darker.

Any ideas?

color

color

share|improve this question

edited 4 hours ago

asked 4 hours ago

bs7599

62

New contributor

bs7599 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 4 hours ago

asked 4 hours ago

bs7599

62

New contributor

bs7599 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

share|improve this question

edited 4 hours ago

edited 4 hours ago

edited 4 hours ago

asked 4 hours ago

bs7599

62

New contributor

bs7599 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 4 hours ago

bs7599

62

asked 4 hours ago

bs7599

62

62

New contributor

bs7599 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

New contributor

bs7599 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

bs7599 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

add a comment | 

1 Answer
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No! There is not a single reason, why this should work. Manually adding HSV-System values will not necessary result in the same color as different other mixing methods.

Counterexample:
Mix the turquoise colors [H=0.49,S=1,V=1] and [H=0.51,S=1,V=1] and a similar turquoise color will be the result. But if you add the values the result is red [H=1,S=1,V=1]

The reason for this behavior is purely based on the mathematics of color mixing and is not a question concerning blender.

share|improve this answer

answered 3 hours ago

quiliup

628114

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  See also en.wikipedia.org/wiki/HSL_and_HSV. The ‘H’ component is cyclic rather than linear so adding 2 of them results in nonsense.
  – Rich Sedman
  1 hour ago
  

  
  
  
  

add a comment | 

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

active

oldest

votes

active

oldest

votes

up vote
3
down vote

No! There is not a single reason, why this should work. Manually adding HSV-System values will not necessary result in the same color as different other mixing methods.

Counterexample:
Mix the turquoise colors [H=0.49,S=1,V=1] and [H=0.51,S=1,V=1] and a similar turquoise color will be the result. But if you add the values the result is red [H=1,S=1,V=1]

The reason for this behavior is purely based on the mathematics of color mixing and is not a question concerning blender.

share|improve this answer

answered 3 hours ago

quiliup

628114

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  See also en.wikipedia.org/wiki/HSL_and_HSV. The ‘H’ component is cyclic rather than linear so adding 2 of them results in nonsense.
  – Rich Sedman
  1 hour ago
  

  
  
  
  

add a comment | 

up vote
3
down vote

No! There is not a single reason, why this should work. Manually adding HSV-System values will not necessary result in the same color as different other mixing methods.

Counterexample:
Mix the turquoise colors [H=0.49,S=1,V=1] and [H=0.51,S=1,V=1] and a similar turquoise color will be the result. But if you add the values the result is red [H=1,S=1,V=1]

The reason for this behavior is purely based on the mathematics of color mixing and is not a question concerning blender.

share|improve this answer

answered 3 hours ago

quiliup

628114

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  See also en.wikipedia.org/wiki/HSL_and_HSV. The ‘H’ component is cyclic rather than linear so adding 2 of them results in nonsense.
  – Rich Sedman
  1 hour ago
  

  
  
  
  

add a comment | 

up vote
3
down vote

up vote
3
down vote

No! There is not a single reason, why this should work. Manually adding HSV-System values will not necessary result in the same color as different other mixing methods.

Counterexample:
Mix the turquoise colors [H=0.49,S=1,V=1] and [H=0.51,S=1,V=1] and a similar turquoise color will be the result. But if you add the values the result is red [H=1,S=1,V=1]

The reason for this behavior is purely based on the mathematics of color mixing and is not a question concerning blender.

share|improve this answer

answered 3 hours ago

quiliup

628114

No! There is not a single reason, why this should work. Manually adding HSV-System values will not necessary result in the same color as different other mixing methods.

Counterexample:
Mix the turquoise colors [H=0.49,S=1,V=1] and [H=0.51,S=1,V=1] and a similar turquoise color will be the result. But if you add the values the result is red [H=1,S=1,V=1]

The reason for this behavior is purely based on the mathematics of color mixing and is not a question concerning blender.

share|improve this answer

answered 3 hours ago

quiliup

628114

share|improve this answer

share|improve this answer

answered 3 hours ago

quiliup

628114

answered 3 hours ago

quiliup

628114

answered 3 hours ago

quiliup

628114

628114

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  See also en.wikipedia.org/wiki/HSL_and_HSV. The ‘H’ component is cyclic rather than linear so adding 2 of them results in nonsense.
  – Rich Sedman
  1 hour ago
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  See also en.wikipedia.org/wiki/HSL_and_HSV. The ‘H’ component is cyclic rather than linear so adding 2 of them results in nonsense.
  – Rich Sedman
  1 hour ago
  

  
  
  
  

1

1

See also en.wikipedia.org/wiki/HSL_and_HSV. The ‘H’ component is cyclic rather than linear so adding 2 of them results in nonsense.
– Rich Sedman
1 hour ago

See also en.wikipedia.org/wiki/HSL_and_HSV. The ‘H’ component is cyclic rather than linear so adding 2 of them results in nonsense.
– Rich Sedman
1 hour ago

add a comment | 

bs7599 is a new contributor. Be nice, and check out our Code of Conduct.

 

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