Light and color theory is very interesting to me. Can you please explain how the subtractive light model works? For example, I understand the additive model, in that one is adding light, such as Red and Green to make Yellow light. What does it mean to subract Cyan light from Yellow light to create Green light, in example? I hope you understand what I am asking. I guess I wish to know the science behind it.
In the additive model you _add_ colors starting from no color/light at all (i.e. from black). If you add the three primary colors (assuming they are very pure, i.e. all three are at their primary wavelength) you get pure white color. In the subtractive model you do the reverse : you start from pure white color and you "subtract" colors from it. Eventually, if you add three near perfect secondary colors (yellow, cyan and magenta) you end up with black. To my knowledge the "additive" vs "subtractive" distinction refers to the ultimate end of the road for both models (white and black respectively) rather to any intermediate combinations of primary or secondary colors.
In subtractive, you start with white and filter out colors. With C and Y filters, let W = B + G + R in our simple model where B is the first third of the spectrum, G is the middle, R is the third. After going through C, you get B + G. Then trying to go through Y, only G and R gets through. Since you have no R due to the C filter, only G gets through.
@@NikolaosSkordilis Good points. I see what you mean. Note that pure is often use to mean one wavelength like laser light. The about filters transmit many wavelengths.
To start, remember that there are only two principles of color, I call these light and pigment principle. Different light hues combine a lighter combination while different pigment hues combine a darker combination. The term "subtractive" is actually derived and made (to oppose) from the opposite additive color and the term is confusing when you really don't know the history of them. The first one invented is the additive color. In additive color, you add different light hues to make the combination lighter. In subtractive color, you add different pigment hues to make the combination darker. To avoid the confusion between the two since they both add in their parts; add more light and add more pigment, the term "subtractive" is made since the additive is the first invented and the opposite of addition is subtraction. So it is much like "subtracting" the light in pigment principle because it is the opposite of the light principle called additive color and your combinations also turn darker, more like reducing the light in them. These sites can help you mix light and pigment colors: csfieldguide.org.nz/en/interactives/rgb-mixer/index.html csfieldguide.org.nz/en/interactives/cmy-mixer/index.html
@@kyleyoung2464 right, not sure how to set that up easily in the real world. But for the color addition with three projectors I would move projectors at different distances to get variations. With dimmer lights, it would even be better.
Use this model to figure out different room lights. Take white as W = R + G + B and the Cyan filter passing B + G, Magenta passing B + R, and Yellow passing G + R. If you start with cyan light, you start with B + G. Then take this cyan through the filters using the passing rules and you can figure everything out.
Yes. Violet is a neat color. I had to use a magenta filter that passes blues and reds so that I could get a red by color subtraction with a yellow filter that passes greens and reds.
I believe there were obtained many years ago from either Arbor Scientific or Edmund Scientific in Barrington, NC. My Drama students bring me cool small catalogs for filters from Rosco where the Drama department buys gels to get colored stage lights. Check Arbor Scientific first and second, places that sell gels for stage lighting.
+LOLFlyingPotatoes Right. Those filters can vary. To keep everyone on the same page in class I say let's consider two kinds of basic purples - one spectral where I use Violet always (from the rainbow ROYGBIV) and one nonspectral (mixture) which I always use Magenta from subtractive primaries (CYM = cyan-yellow-magenta). But then lavender sneaks into the course and other shades of purple.
Here is something I did on additive. th-cam.com/video/bMkfcH43k6E/w-d-xo.html I will have those color mixing apps up and running at mjtruiz.com/ this summer.
The artist's BLUE has some green in it. So in class I say that the Artist's BLUE is a CYAN. And the artist's RED is a magenta. In software when one works with color filters doing subtraction, they are careful to list these as cyan, magenta, and yellow. But I tell my students to respect the artists. Just remember that the artist's blue is a cyan.
![POLYCAT - ข้อความรูปยิ้ม [Music Video]](http://i.ytimg.com/vi/lBhIgPGCgbI/mqdefault.jpg)
Amazing Video!
And Yes! Cyan Color in Subtractive Thing (Paint, Ink, ETC) Looks like that!
Light and color theory is very interesting to me. Can you please explain how the subtractive light model works? For example, I understand the additive model, in that one is adding light, such as Red and Green to make Yellow light. What does it mean to subract Cyan light from Yellow light to create Green light, in example? I hope you understand what I am asking. I guess I wish to know the science behind it.
This site looks pretty good: www.mwit.ac.th/~physicslab/applet_04/physics_classroom/Class/light/u12l2e.html
In the additive model you _add_ colors starting from no color/light at all (i.e. from black). If you add the three primary colors (assuming they are very pure, i.e. all three are at their primary wavelength) you get pure white color.
In the subtractive model you do the reverse : you start from pure white color and you "subtract" colors from it. Eventually, if you add three near perfect secondary colors (yellow, cyan and magenta) you end up with black.
To my knowledge the "additive" vs "subtractive" distinction refers to the ultimate end of the road for both models (white and black respectively) rather to any intermediate combinations of primary or secondary colors.
In subtractive, you start with white and filter out colors. With C and Y filters, let W = B + G + R in our simple model where B is the first third of the spectrum, G is the middle, R is the third. After going through C, you get B + G. Then trying to go through Y, only G and R gets through. Since you have no R due to the C filter, only G gets through.
@@NikolaosSkordilis Good points. I see what you mean. Note that pure is often use to mean one wavelength like laser light. The about filters transmit many wavelengths.
To start, remember that there are only two principles of color, I call these light and pigment principle. Different light hues combine a lighter combination while different pigment hues combine a darker combination.
The term "subtractive" is actually derived and made (to oppose) from the opposite additive color and the term is confusing when you really don't know the history of them.
The first one invented is the additive color. In additive color, you add different light hues to make the combination lighter. In subtractive color, you add different pigment hues to make the combination darker. To avoid the confusion between the two since they both add in their parts; add more light and add more pigment, the term "subtractive" is made since the additive is the first invented and the opposite of addition is subtraction.
So it is much like "subtracting" the light in pigment principle because it is the opposite of the light principle called additive color and your combinations also turn darker, more like reducing the light in them.
These sites can help you mix light and pigment colors:
csfieldguide.org.nz/en/interactives/rgb-mixer/index.html
csfieldguide.org.nz/en/interactives/cmy-mixer/index.html
Thanks for this. Needed this than explanation.
Gutes Beispiel, helped me trés bien
If the transparency was variable could you get any color? Like a full color lcd panel?
Yes, you should. Check out my simulations of variable transparencies here: mjtruiz.com/TPT/color/ Try out the fourth one. - figure 4 on that page.
@@DoctorPhys thank you! If only there was a way do do that in the real world.
@@kyleyoung2464 right, not sure how to set that up easily in the real world. But for the color addition with three projectors I would move projectors at different distances to get variations. With dimmer lights, it would even be better.
Thanks alot sir.. sir pls do this experiment with cyan yellow magenta light . What color output plzz😢😊l
Use this model to figure out different room lights. Take white as W = R + G + B and the Cyan filter passing B + G, Magenta passing B + R, and Yellow passing G + R. If you start with cyan light, you start with B + G. Then take this cyan through the filters using the passing rules and you can figure everything out.
Your third filter looks like a 380-450nm violet filter.
Yes. Violet is a neat color. I had to use a magenta filter that passes blues and reds so that I could get a red by color subtraction with a yellow filter that passes greens and reds.
Where did you get your filters? We've had trouble finding good ones.
I believe there were obtained many years ago from either Arbor Scientific or Edmund Scientific in Barrington, NC. My Drama students bring me cool small catalogs for filters from Rosco where the Drama department buys gels to get colored stage lights. Check Arbor Scientific first and second, places that sell gels for stage lighting.
I think these were from Edmund Scientific but I am not positive. www.edmundscientific.com/
I got those years ago I believe at Edmund Scientific in NJ or Arbor Scientific.
0:19 I'd say that is more of a purple colour. Magenta looks like a more red version of pink.
+LOLFlyingPotatoes Right. Those filters can vary. To keep everyone on the same page in class I say let's consider two kinds of basic purples - one spectral where I use Violet always (from the rainbow ROYGBIV) and one nonspectral (mixture) which I always use Magenta from subtractive primaries (CYM = cyan-yellow-magenta). But then lavender sneaks into the course and other shades of purple.
Right. Hard to get good filters that are inexpensive.
it had to match the video that came out 2 days before so he can get more watchtime because he is stupid
ah o sistema...
do you get the same results with paint?
Pretty much. So the artist's primaries are cyan (blue), yellow, and magenta (red).
@@DrMichaelRuizcyan isn’t blue and magenta isn’t red. They’re their own colors
The cyan should be lighter than that, that is not a cyan, that's why green looks dark!!!
Right. There is such a range when you buy filters. You never know how good each color will be.
can leds do that?
LEDs side by side would obey addition rules if the lights overlap in your eye.
Yes
Magenta looks like purple
Magenta is any colour that is purple-ish
@@mynahification magenta is the colour directly between red and blue.
@@heavoid the magenta is primary color, when you mix blue and red you find the purple, not magenta
@@sandiaconmelon3266 when you mix red and blue light, you will find magenta. purple is somewhat between violet and magenta, i think.
@@heavoid purple is magenta with black
yes, red light mixed whit bluie light make magenta (rgb, not cmy, beacuse the magneta is primary in cmy)
Do additive
Here is something I did on additive.
th-cam.com/video/bMkfcH43k6E/w-d-xo.html
I will have those color mixing apps up and running at mjtruiz.com/ this summer.
Cmyk
bur but blue is a primary color!,!!!
The artist's BLUE has some green in it. So in class I say that the Artist's BLUE is a CYAN. And the artist's RED is a magenta. In software when one works with color filters doing subtraction, they are careful to list these as cyan, magenta, and yellow. But I tell my students to respect the artists. Just remember that the artist's blue is a cyan.
ahahahaha, şaka gibi