It is correct to match light sources with the same color temperature? The Next CEO of Stack...

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It is correct to match light sources with the same color temperature?



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2















For example, the color temperature of a candle flame, sunrise and sunset have the same color temperature, knowing that its color temperature is the same, could you say that these sources are similar or equivalent? Could you say that they would produce the same picture of a scene? Could you say that the values of the pixels are the same with these three sources of light? Thanks in advance










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  • 1





    I mean, if you disregard the billion x difference in lumens...then yea, I suppose you could say they’re similar :-D jokes aside - this question seems unclear to me. What problem are you trying to solve?

    – Hueco
    2 hours ago













  • s it possible to quantify the sun in lumens? I think the only thing I've seen is that you can quantify in luxes. This question is no joke, excuse my ignorance, I am a little new in this. The problem I am trying to solve is to relate artificial light sources and natural light sources and see if there is any similarity between them, the only similarity I could find was through the color temperature.

    – SRG
    2 hours ago











  • An example of relating to sources of natural and artificial light that I could think was sunrise and sunset and some household lamps. The sunlight at sunrise and sunset have a temperature of 2400 ° K while some light bulbs have a temperature of 2800 ° K, these are values ​​that are a little close, I thought about relating. Is this correct?

    – SRG
    2 hours ago
















2















For example, the color temperature of a candle flame, sunrise and sunset have the same color temperature, knowing that its color temperature is the same, could you say that these sources are similar or equivalent? Could you say that they would produce the same picture of a scene? Could you say that the values of the pixels are the same with these three sources of light? Thanks in advance










share|improve this question









New contributor




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
















  • 1





    I mean, if you disregard the billion x difference in lumens...then yea, I suppose you could say they’re similar :-D jokes aside - this question seems unclear to me. What problem are you trying to solve?

    – Hueco
    2 hours ago













  • s it possible to quantify the sun in lumens? I think the only thing I've seen is that you can quantify in luxes. This question is no joke, excuse my ignorance, I am a little new in this. The problem I am trying to solve is to relate artificial light sources and natural light sources and see if there is any similarity between them, the only similarity I could find was through the color temperature.

    – SRG
    2 hours ago











  • An example of relating to sources of natural and artificial light that I could think was sunrise and sunset and some household lamps. The sunlight at sunrise and sunset have a temperature of 2400 ° K while some light bulbs have a temperature of 2800 ° K, these are values ​​that are a little close, I thought about relating. Is this correct?

    – SRG
    2 hours ago














2












2








2








For example, the color temperature of a candle flame, sunrise and sunset have the same color temperature, knowing that its color temperature is the same, could you say that these sources are similar or equivalent? Could you say that they would produce the same picture of a scene? Could you say that the values of the pixels are the same with these three sources of light? Thanks in advance










share|improve this question









New contributor




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












For example, the color temperature of a candle flame, sunrise and sunset have the same color temperature, knowing that its color temperature is the same, could you say that these sources are similar or equivalent? Could you say that they would produce the same picture of a scene? Could you say that the values of the pixels are the same with these three sources of light? Thanks in advance







color white-balance light image-processing






share|improve this question









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SRG 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









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SRG 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 48 mins ago









mattdm

122k40357653




122k40357653






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Check out our Code of Conduct.









asked 3 hours ago









SRGSRG

112




112




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New contributor





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






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








  • 1





    I mean, if you disregard the billion x difference in lumens...then yea, I suppose you could say they’re similar :-D jokes aside - this question seems unclear to me. What problem are you trying to solve?

    – Hueco
    2 hours ago













  • s it possible to quantify the sun in lumens? I think the only thing I've seen is that you can quantify in luxes. This question is no joke, excuse my ignorance, I am a little new in this. The problem I am trying to solve is to relate artificial light sources and natural light sources and see if there is any similarity between them, the only similarity I could find was through the color temperature.

    – SRG
    2 hours ago











  • An example of relating to sources of natural and artificial light that I could think was sunrise and sunset and some household lamps. The sunlight at sunrise and sunset have a temperature of 2400 ° K while some light bulbs have a temperature of 2800 ° K, these are values ​​that are a little close, I thought about relating. Is this correct?

    – SRG
    2 hours ago














  • 1





    I mean, if you disregard the billion x difference in lumens...then yea, I suppose you could say they’re similar :-D jokes aside - this question seems unclear to me. What problem are you trying to solve?

    – Hueco
    2 hours ago













  • s it possible to quantify the sun in lumens? I think the only thing I've seen is that you can quantify in luxes. This question is no joke, excuse my ignorance, I am a little new in this. The problem I am trying to solve is to relate artificial light sources and natural light sources and see if there is any similarity between them, the only similarity I could find was through the color temperature.

    – SRG
    2 hours ago











  • An example of relating to sources of natural and artificial light that I could think was sunrise and sunset and some household lamps. The sunlight at sunrise and sunset have a temperature of 2400 ° K while some light bulbs have a temperature of 2800 ° K, these are values ​​that are a little close, I thought about relating. Is this correct?

    – SRG
    2 hours ago








1




1





I mean, if you disregard the billion x difference in lumens...then yea, I suppose you could say they’re similar :-D jokes aside - this question seems unclear to me. What problem are you trying to solve?

– Hueco
2 hours ago







I mean, if you disregard the billion x difference in lumens...then yea, I suppose you could say they’re similar :-D jokes aside - this question seems unclear to me. What problem are you trying to solve?

– Hueco
2 hours ago















s it possible to quantify the sun in lumens? I think the only thing I've seen is that you can quantify in luxes. This question is no joke, excuse my ignorance, I am a little new in this. The problem I am trying to solve is to relate artificial light sources and natural light sources and see if there is any similarity between them, the only similarity I could find was through the color temperature.

– SRG
2 hours ago





s it possible to quantify the sun in lumens? I think the only thing I've seen is that you can quantify in luxes. This question is no joke, excuse my ignorance, I am a little new in this. The problem I am trying to solve is to relate artificial light sources and natural light sources and see if there is any similarity between them, the only similarity I could find was through the color temperature.

– SRG
2 hours ago













An example of relating to sources of natural and artificial light that I could think was sunrise and sunset and some household lamps. The sunlight at sunrise and sunset have a temperature of 2400 ° K while some light bulbs have a temperature of 2800 ° K, these are values ​​that are a little close, I thought about relating. Is this correct?

– SRG
2 hours ago





An example of relating to sources of natural and artificial light that I could think was sunrise and sunset and some household lamps. The sunlight at sunrise and sunset have a temperature of 2400 ° K while some light bulbs have a temperature of 2800 ° K, these are values ​​that are a little close, I thought about relating. Is this correct?

– SRG
2 hours ago










2 Answers
2






active

oldest

votes


















2














It's roughly true that light sources with the same color temperature have the same appearance. However, there are three big caveats.



First, there's also a magenta-green axis



Human perception of color is complicated. White balance as measured in Kelvin is simplification of one aspect of that perception, basically relating to orange/blue balance. This is reasonably helpful for light sources that approximate blackbody radiation, but doesn't fit for a lot of artificial light sources, which may tilt more towards green or magenta — tints which are off the Kelvin WB scale.



Second, not every light source covers a complete spectrum



Sunlight filtered through the atmosphere, or the candlelight you mention, or an incandescent bulb — all of these have a clear weight on that Kelvin scale, but they also put out light across the visible spectrum (and into the invisible infrared and ultraviolet). This is not the case with gas-discharge or fluorescent light sources. That includes sodium-vapor streetlights, fluorescent bulbs, and LED lighting.



Third, the numbers are nominal.



No candle flame snaps to exactly 1800K, and the color of sunrise and sunset is so complex that it's probably safe to say that literally every one is different.



Sooooo.....



You ask:




Could you say that the values of the pixels are the same with these three sources of light?




And in practice, no, this is completely unlikely.



They may, however, be similar enough that they work together in a single photograph without causing the disruptive look we get when one area of the photograph is cool blue and another quite orange due to mixed lighting.



In your example of a bulb rated 2800K and a sunrise or sunset coming through a window (nominally 2400K), the window light may look a little warm (that is, warm in the artistic rather than physical sense: more orange) in your photograph balanced for the 2800K bulb — but then, that may be exactly what you want.






share|improve this answer































    0














    It wouldn't be accurate to say the sources are the same but it would be accurate to say the they are similar. Atmospheric differences (moisture, dust, etc.) can change the color temperature of the sun not just from day to day, but even from minute to minute.



    Since lighting conditions are often dim, if you want to photograph a subject in these conditions, a flash might be used. You can use a CTO gel on the flash (CTO = Color Temperature Orange) to bring the color of the flash closer to the color of the candlelight or sunlight so that any color-adjustments performed in post processing wont have radically different color temperatures. But even the CTO gels come in 1/4, 1/2, 3/4 and full CTO strength (depending on whether you need a pale yellow/gold vs. an intense orange).






    share|improve this answer
























      Your Answer








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      2 Answers
      2






      active

      oldest

      votes








      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      2














      It's roughly true that light sources with the same color temperature have the same appearance. However, there are three big caveats.



      First, there's also a magenta-green axis



      Human perception of color is complicated. White balance as measured in Kelvin is simplification of one aspect of that perception, basically relating to orange/blue balance. This is reasonably helpful for light sources that approximate blackbody radiation, but doesn't fit for a lot of artificial light sources, which may tilt more towards green or magenta — tints which are off the Kelvin WB scale.



      Second, not every light source covers a complete spectrum



      Sunlight filtered through the atmosphere, or the candlelight you mention, or an incandescent bulb — all of these have a clear weight on that Kelvin scale, but they also put out light across the visible spectrum (and into the invisible infrared and ultraviolet). This is not the case with gas-discharge or fluorescent light sources. That includes sodium-vapor streetlights, fluorescent bulbs, and LED lighting.



      Third, the numbers are nominal.



      No candle flame snaps to exactly 1800K, and the color of sunrise and sunset is so complex that it's probably safe to say that literally every one is different.



      Sooooo.....



      You ask:




      Could you say that the values of the pixels are the same with these three sources of light?




      And in practice, no, this is completely unlikely.



      They may, however, be similar enough that they work together in a single photograph without causing the disruptive look we get when one area of the photograph is cool blue and another quite orange due to mixed lighting.



      In your example of a bulb rated 2800K and a sunrise or sunset coming through a window (nominally 2400K), the window light may look a little warm (that is, warm in the artistic rather than physical sense: more orange) in your photograph balanced for the 2800K bulb — but then, that may be exactly what you want.






      share|improve this answer




























        2














        It's roughly true that light sources with the same color temperature have the same appearance. However, there are three big caveats.



        First, there's also a magenta-green axis



        Human perception of color is complicated. White balance as measured in Kelvin is simplification of one aspect of that perception, basically relating to orange/blue balance. This is reasonably helpful for light sources that approximate blackbody radiation, but doesn't fit for a lot of artificial light sources, which may tilt more towards green or magenta — tints which are off the Kelvin WB scale.



        Second, not every light source covers a complete spectrum



        Sunlight filtered through the atmosphere, or the candlelight you mention, or an incandescent bulb — all of these have a clear weight on that Kelvin scale, but they also put out light across the visible spectrum (and into the invisible infrared and ultraviolet). This is not the case with gas-discharge or fluorescent light sources. That includes sodium-vapor streetlights, fluorescent bulbs, and LED lighting.



        Third, the numbers are nominal.



        No candle flame snaps to exactly 1800K, and the color of sunrise and sunset is so complex that it's probably safe to say that literally every one is different.



        Sooooo.....



        You ask:




        Could you say that the values of the pixels are the same with these three sources of light?




        And in practice, no, this is completely unlikely.



        They may, however, be similar enough that they work together in a single photograph without causing the disruptive look we get when one area of the photograph is cool blue and another quite orange due to mixed lighting.



        In your example of a bulb rated 2800K and a sunrise or sunset coming through a window (nominally 2400K), the window light may look a little warm (that is, warm in the artistic rather than physical sense: more orange) in your photograph balanced for the 2800K bulb — but then, that may be exactly what you want.






        share|improve this answer


























          2












          2








          2







          It's roughly true that light sources with the same color temperature have the same appearance. However, there are three big caveats.



          First, there's also a magenta-green axis



          Human perception of color is complicated. White balance as measured in Kelvin is simplification of one aspect of that perception, basically relating to orange/blue balance. This is reasonably helpful for light sources that approximate blackbody radiation, but doesn't fit for a lot of artificial light sources, which may tilt more towards green or magenta — tints which are off the Kelvin WB scale.



          Second, not every light source covers a complete spectrum



          Sunlight filtered through the atmosphere, or the candlelight you mention, or an incandescent bulb — all of these have a clear weight on that Kelvin scale, but they also put out light across the visible spectrum (and into the invisible infrared and ultraviolet). This is not the case with gas-discharge or fluorescent light sources. That includes sodium-vapor streetlights, fluorescent bulbs, and LED lighting.



          Third, the numbers are nominal.



          No candle flame snaps to exactly 1800K, and the color of sunrise and sunset is so complex that it's probably safe to say that literally every one is different.



          Sooooo.....



          You ask:




          Could you say that the values of the pixels are the same with these three sources of light?




          And in practice, no, this is completely unlikely.



          They may, however, be similar enough that they work together in a single photograph without causing the disruptive look we get when one area of the photograph is cool blue and another quite orange due to mixed lighting.



          In your example of a bulb rated 2800K and a sunrise or sunset coming through a window (nominally 2400K), the window light may look a little warm (that is, warm in the artistic rather than physical sense: more orange) in your photograph balanced for the 2800K bulb — but then, that may be exactly what you want.






          share|improve this answer













          It's roughly true that light sources with the same color temperature have the same appearance. However, there are three big caveats.



          First, there's also a magenta-green axis



          Human perception of color is complicated. White balance as measured in Kelvin is simplification of one aspect of that perception, basically relating to orange/blue balance. This is reasonably helpful for light sources that approximate blackbody radiation, but doesn't fit for a lot of artificial light sources, which may tilt more towards green or magenta — tints which are off the Kelvin WB scale.



          Second, not every light source covers a complete spectrum



          Sunlight filtered through the atmosphere, or the candlelight you mention, or an incandescent bulb — all of these have a clear weight on that Kelvin scale, but they also put out light across the visible spectrum (and into the invisible infrared and ultraviolet). This is not the case with gas-discharge or fluorescent light sources. That includes sodium-vapor streetlights, fluorescent bulbs, and LED lighting.



          Third, the numbers are nominal.



          No candle flame snaps to exactly 1800K, and the color of sunrise and sunset is so complex that it's probably safe to say that literally every one is different.



          Sooooo.....



          You ask:




          Could you say that the values of the pixels are the same with these three sources of light?




          And in practice, no, this is completely unlikely.



          They may, however, be similar enough that they work together in a single photograph without causing the disruptive look we get when one area of the photograph is cool blue and another quite orange due to mixed lighting.



          In your example of a bulb rated 2800K and a sunrise or sunset coming through a window (nominally 2400K), the window light may look a little warm (that is, warm in the artistic rather than physical sense: more orange) in your photograph balanced for the 2800K bulb — but then, that may be exactly what you want.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 59 mins ago









          mattdmmattdm

          122k40357653




          122k40357653

























              0














              It wouldn't be accurate to say the sources are the same but it would be accurate to say the they are similar. Atmospheric differences (moisture, dust, etc.) can change the color temperature of the sun not just from day to day, but even from minute to minute.



              Since lighting conditions are often dim, if you want to photograph a subject in these conditions, a flash might be used. You can use a CTO gel on the flash (CTO = Color Temperature Orange) to bring the color of the flash closer to the color of the candlelight or sunlight so that any color-adjustments performed in post processing wont have radically different color temperatures. But even the CTO gels come in 1/4, 1/2, 3/4 and full CTO strength (depending on whether you need a pale yellow/gold vs. an intense orange).






              share|improve this answer




























                0














                It wouldn't be accurate to say the sources are the same but it would be accurate to say the they are similar. Atmospheric differences (moisture, dust, etc.) can change the color temperature of the sun not just from day to day, but even from minute to minute.



                Since lighting conditions are often dim, if you want to photograph a subject in these conditions, a flash might be used. You can use a CTO gel on the flash (CTO = Color Temperature Orange) to bring the color of the flash closer to the color of the candlelight or sunlight so that any color-adjustments performed in post processing wont have radically different color temperatures. But even the CTO gels come in 1/4, 1/2, 3/4 and full CTO strength (depending on whether you need a pale yellow/gold vs. an intense orange).






                share|improve this answer


























                  0












                  0








                  0







                  It wouldn't be accurate to say the sources are the same but it would be accurate to say the they are similar. Atmospheric differences (moisture, dust, etc.) can change the color temperature of the sun not just from day to day, but even from minute to minute.



                  Since lighting conditions are often dim, if you want to photograph a subject in these conditions, a flash might be used. You can use a CTO gel on the flash (CTO = Color Temperature Orange) to bring the color of the flash closer to the color of the candlelight or sunlight so that any color-adjustments performed in post processing wont have radically different color temperatures. But even the CTO gels come in 1/4, 1/2, 3/4 and full CTO strength (depending on whether you need a pale yellow/gold vs. an intense orange).






                  share|improve this answer













                  It wouldn't be accurate to say the sources are the same but it would be accurate to say the they are similar. Atmospheric differences (moisture, dust, etc.) can change the color temperature of the sun not just from day to day, but even from minute to minute.



                  Since lighting conditions are often dim, if you want to photograph a subject in these conditions, a flash might be used. You can use a CTO gel on the flash (CTO = Color Temperature Orange) to bring the color of the flash closer to the color of the candlelight or sunlight so that any color-adjustments performed in post processing wont have radically different color temperatures. But even the CTO gels come in 1/4, 1/2, 3/4 and full CTO strength (depending on whether you need a pale yellow/gold vs. an intense orange).







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 1 hour ago









                  Tim CampbellTim Campbell

                  5266




                  5266






















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