What is Color?
Nov 21, 2022 09:57:03 #
selmslie wrote:
Some people are color blind and some sensors or film are designed to record beyond the visible range and return "false color" images or simply B&W.
Nov 21, 2022 09:57:25 #
If a tree falls in the forest and no one sees it, what color were the leaves?
Nov 21, 2022 10:00:49 #
selmslie wrote:
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It's not only reflected. You are looking at a screen right now.
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It's not only reflected. You are looking at a screen right now.
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Yea, I originally did not have the word "reflected" in my statement, but then I thought that most objects that we look at are providing reflected light - scenery, animals, buildings, furniture, ....
Nov 21, 2022 10:01:01 #
Longshadow wrote:
I thought they were uncalibrated eyeballs. 
I thought they were uncalibrated eyeballs. I got mine calibrated four years ago.
Nov 21, 2022 10:08:41 #
Longshadow wrote:
Yea, I originally did not have the word "reflected" in my statement, but then I thought that most objects that we look at are providing reflected light - scenery, animals, buildings, furniture, ....
The OP made the same assumption.
It's understandable because we usually think of color as being something inherent in an object.
When the color of the incident light changes we might perceive that the color of the object has not changed.
Nov 21, 2022 10:08:51 #
selmslie wrote:
I got mine calibrated four years ago.
When I was in high school, one teacher accused me of having calibrated eyelashes when getting numbers from the slide rule. Haven't had my eyeballs calibrated yet...
Nov 21, 2022 11:50:29 #
again i iterate that while how the brain perceives color is of concern, that is not the point.
http://www.primaryfocusphoto.com/color-by-the-numbers/ and
http://www.primaryfocusphoto.com/why-color/ address some of these issues.
http://www.primaryfocusphoto.com/color-by-the-numbers/ and
http://www.primaryfocusphoto.com/why-color/ address some of these issues.
Nov 21, 2022 13:35:08 #
Ysarex
Loc: St. Louis
Doyle Thomas wrote:
again i iterate that while how the brain perceives color is of concern, that is not the point.
http://www.primaryfocusphoto.com/color-by-the-numbers/ and
http://www.primaryfocusphoto.com/why-color/ address some of these issues.
http://www.primaryfocusphoto.com/color-by-the-numbers/ and
http://www.primaryfocusphoto.com/why-color/ address some of these issues.
OK, so you didn't want to ask the question; "What is Color?" You want to talk about something else related to color?
Nov 21, 2022 13:37:15 #
Doyle Thomas wrote:
i am trying to define how the color of an object is seen and color is a range of wavelengths in the electromagnetic spectrum.
Color is mostly in the brain. The various wavelengths that enter the eye interact with the retinal cells, which generate signals that are transmitted to the brain, where they are interpreted. As anyone who has had cataracts removed can verify, the various wavelengths may be filtered by the various elements between the outside world and the retina. Aging of the lens is probably the most common source of filtration, but the vitreous humor and the cornea may have effects also.
Having had my cataracts removed, I noted that there was a change in the color seen by an eye that had just had a new lens implanted and the eye that still had the cataract filtering the light. Over the course of the week between procedures on the two eyes, the perceived color difference faded. The wavelengths of light that entered my eyes did not change, but the brain learned over that week that the filtration in the two eyes was different and made adjustments in the perceived color.
In people who have various forms of color blindness, some colors do not exist because their brain does not get the appropriate signals from their eyes.
Color is perception, not wavelength.
Nov 21, 2022 14:20:02 #
Nov 22, 2022 02:57:56 #
DirtFarmer wrote:
Color is mostly in the brain. The various wavelengths that enter the eye interact with the retinal cells, which generate signals that are transmitted to the brain, where they are interpreted.
In people who have various forms of color blindness, some colors do not exist because their brain does not get the appropriate signals from their eyes.
Color is perception, not wavelength.
In people who have various forms of color blindness, some colors do not exist because their brain does not get the appropriate signals from their eyes.
Color is perception, not wavelength.
!!!???!!! color exists in the real world and interact with the brain but it is in the Mind that they are interpreted. just because a color does not speak to some does not mean that it does not speak.
Nov 22, 2022 04:55:48 #
Ysarex wrote:
You asked a question. Your description of function that follows does not answer the question. Color is not wavelengths of light reflected off an object. You're trying to define a phenomenon by describing the underlying mechanism that generates the phenomenon. That leaves the phenomenon undefined.
I dont always agree with Ysarex (!) but in this instance I can agree 100%.
The given information fits the question "Where does color come from ?" but NOT "What is color ?".
IOW, the info is not faulty, but the title of the thread is poorly worded for the topic addressed in the opening post.
Nov 22, 2022 04:59:39 #
Longshadow wrote:
The perception of the different wavelengths of visible light reflected off an object.
No observer=no perception=no color.
Nov 22, 2022 05:08:52 #
Doyle Thomas wrote:
What is Color? br br As most Photographers know c... (show quote)
Color is how we perceive certain wavelengths of energy, and often, the same wavelength is interpreted differently by individuals. Meaning, not everyone see the same color. We can see colors straight from a source (radiation), transmission through a media and from reflections.
While the color of a source may depend on temperature or element/chemical content,
an objects' color will always depend on what it is reflecting and/or allowing to pass through. As an example, an orange can be green or red depending on the light shining on it. An orange is orange because it reflects both red and green wavelengths of energy while absorbing the blue. As it does, the reflected light activate the red and green cones in our eyes and that mix of signals is interpreted as the orange color in our brain. The rods are stimulated by all 3 wavelengths (Red, green & blue) but only interpreted them as brightness or intensity.
Changing the ratio of red and green will change the color of the orange, but within a certain range, it remains the same orange color in our eyes because our brain corrects for the shift because it is biased by experience and its need to make things cohesive and ordered.
Nov 22, 2022 05:08:54 #
Ysarex wrote:
You asked a question. Your description of function that follows does not answer the question. Color is not wavelengths of light reflected off an object. You're trying to define a phenomenon by describing the underlying mechanism that generates the phenomenon. That leaves the phenomenon undefined.
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