Understanding colors
Mar 19, 2017 16:14:07 #
The final purpose of these posts is to understand how the Inkject family of printers reproduce the color taken by your camera. I will cut them in short themes trying not to bore you.
What is Color?
Imagine a world without color - for that is what really exists. All the objects that surround us have no color. Color exists only in our minds. Color is a visual sensation that involves three elements; a light source,
an object and a viewer. Light from the sun or another light source strikes objects around us, is reflected and modified by the objects, then reaches the receptors in our eyes and is interpreted by our brains into something
we call color. Since color exists only in our minds, explaining the physical aspects of color is just part of the story. The way objects appear to us and the judgments we make about color are determined by a combination
of many factors. Some of the factors are easy to measure and some are not. Individual perceptual differences, eye fatigue and mood of the viewer are as important to a discussion about color as are the properties of light
sources and objects. Colors as perceived by the human eye cannot be simulated by any instrument, nor can they be reproduced by any printing process. Light is essential for vision. Light causes color. Without light, color would not exist. Light that appears white to us, such as light from the sun, is actually composed of many colors. Each color has its own measurable wavelength or combination of wavelengths. (Light travels in waves much like waves produced by dropping a pebble in a pond, except light waves are extremely small.) The wavelengths of light are not colors, but produce the sensation of color. Light is a form of energy.All wavelengths of light are part of the electromagnetic energy spectrum. The spectrum is a continuous sequence of energy waves that vary in length from short to long. Visible light - the wavelengths our eyes can detect - is a small portion of the entire spectrum. At one end of the visible spectrum are the short wavelengths of light we perceive as blue. At the other end of the visible spectrum are the longer wavelengths of light we perceive as red. All the
other colors we can see in nature are found somewhere along the spectrum between blue and red. Beyond the limits at each end of the visible spectrum are the short wavelengths of ultraviolet light and X-rays and the long
wavelengths of infrared radiation and radio waves which are not visible to the human eye. We can separate a beam of white light into its component colors by passing it through a glass prism which causes the light beam to bend. Each wavelength, or color, bends at a slightly different angle which separates the white light into an array of colors. When the sun comes out after a rainstorm, water droplets in the air can act as prisms and display the arc of colors in the sky we see as a rainbow. If the visible portion of the rainbow is divided into thirds, the predominant colors are blue, green and red. These are the primary colors of light. Visible colors can be arranged in a circle, commonly known as the color wheel. Blue, green and red form a triangle on the color wheel. In between the primary colors are the secondary colors, cyan, magenta and yellow, which form another triangle.
Keep posted because I will explain some terms found in your editor that you use but, probably you do not understand.
What is Color?
Imagine a world without color - for that is what really exists. All the objects that surround us have no color. Color exists only in our minds. Color is a visual sensation that involves three elements; a light source,
an object and a viewer. Light from the sun or another light source strikes objects around us, is reflected and modified by the objects, then reaches the receptors in our eyes and is interpreted by our brains into something
we call color. Since color exists only in our minds, explaining the physical aspects of color is just part of the story. The way objects appear to us and the judgments we make about color are determined by a combination
of many factors. Some of the factors are easy to measure and some are not. Individual perceptual differences, eye fatigue and mood of the viewer are as important to a discussion about color as are the properties of light
sources and objects. Colors as perceived by the human eye cannot be simulated by any instrument, nor can they be reproduced by any printing process. Light is essential for vision. Light causes color. Without light, color would not exist. Light that appears white to us, such as light from the sun, is actually composed of many colors. Each color has its own measurable wavelength or combination of wavelengths. (Light travels in waves much like waves produced by dropping a pebble in a pond, except light waves are extremely small.) The wavelengths of light are not colors, but produce the sensation of color. Light is a form of energy.All wavelengths of light are part of the electromagnetic energy spectrum. The spectrum is a continuous sequence of energy waves that vary in length from short to long. Visible light - the wavelengths our eyes can detect - is a small portion of the entire spectrum. At one end of the visible spectrum are the short wavelengths of light we perceive as blue. At the other end of the visible spectrum are the longer wavelengths of light we perceive as red. All the
other colors we can see in nature are found somewhere along the spectrum between blue and red. Beyond the limits at each end of the visible spectrum are the short wavelengths of ultraviolet light and X-rays and the long
wavelengths of infrared radiation and radio waves which are not visible to the human eye. We can separate a beam of white light into its component colors by passing it through a glass prism which causes the light beam to bend. Each wavelength, or color, bends at a slightly different angle which separates the white light into an array of colors. When the sun comes out after a rainstorm, water droplets in the air can act as prisms and display the arc of colors in the sky we see as a rainbow. If the visible portion of the rainbow is divided into thirds, the predominant colors are blue, green and red. These are the primary colors of light. Visible colors can be arranged in a circle, commonly known as the color wheel. Blue, green and red form a triangle on the color wheel. In between the primary colors are the secondary colors, cyan, magenta and yellow, which form another triangle.
Keep posted because I will explain some terms found in your editor that you use but, probably you do not understand.
Mar 19, 2017 18:59:27 #
gmartin4 wrote:
I send to you via email 7 pages that you have to p... (show quote)
How many times will you try to sell your stuff under the cover of 'information'????
Link to quote...
Mar 19, 2017 19:13:31 #
Wao! Looks like I'm in the wrong forum. I was thinking this is a forum to teach each others about the huge world of photography. Photography is not my business, but my passion. Just tell me "get out from here" and I will leave to another forum in wich the people appreciate free learning about the beatifull world of Photography.
Mar 20, 2017 07:12:37 #
gmartin4 wrote:
Wao! Looks like I'm in the wrong forum. I was thinking this is a forum to teach each others about the huge world of photography. Photography is not my business, but my passion. Just tell me "get out from here" and I will leave to another forum in wich the people appreciate free learning about the beatifull world of Photography.
No, you are in the right place, and thanks for sharing. Rongnongno has built a reputation as a crude malcontent, police officer of UHH, and generally contributing little if anything to increase people's knowledge about anything. His favorite weapons are ridicule, baseless and uninvited critique, and yes, the "ignore" button. If he ignores you consider it a sign that you are onto something, and he just can't deal with it.
I would just ignore his vitriol. It's Monday morning, and he probably hasn't had his meds or his coffee yet. But don't expect more from him later, this behavior is pretty standard, though occasionallly he does have better moments.
You are correct - the majority share what they know about photography, and actually use their cameras. Rongnongno has nothing to show, which places his credibility about knowing photography from a practical perspective in serious question. Hard to take someone seriously when all they do is talk about photography, yet never show their work, or offer up examples to support their explanations.
Yes, photography is a beautiful thing. Don't let Rongnongno spoil it for you.
Expect a childish response from Rongnongno - it's coming. I just ignore it and won't respond. He has chosen to ignore me, but somehow he just can't help himself - which I find a little bit hypocritical.
Mar 20, 2017 07:24:22 #
Thanks Gene51. You made my day. Hope there are just one Rongnongno here. We can tolerate one.
Mar 20, 2017 07:51:06 #
The visible light with the shortest wavelength is Violet - around 400nm. Blue is around 475nm. And red is indeed the longest wavelength - around 650nm. I learned the saying "ROYGBIV" probably 100 years ago (not really, but still a long time ago), Red Orange Yellow Green Blue Indigo Violet. That is why light just outside the visible spectrum is called "ultraviolet" and light just outside the other end of the visible spectrum is called "infrared".
https://science-edu.larc.nasa.gov/EDDOCS/Wavelengths_for_Colors.html#violet
https://science-edu.larc.nasa.gov/EDDOCS/Wavelengths_for_Colors.html#violet
Mar 20, 2017 08:39:30 #
Good work Gene51!!!!!
Gene51 wrote:
No, you are in the right place, and thanks for sha... (show quote)
Mar 20, 2017 09:29:39 #
When you see the '$25.00 for my work' you will understand my reaction. The first time it was posted correctly but not this time.
This is especially true when you look at what was offered: a ICC printer profile. ICC that needs to be updated every time a different paper is used and the cartridges changed.
This is especially true when you look at what was offered: a ICC printer profile. ICC that needs to be updated every time a different paper is used and the cartridges changed.
Mar 20, 2017 09:55:56 #
Mar 20, 2017 10:03:59 #
Gmartin4, thanks for sharing. You will find here like in life some really rude people. But for the most part the majority are good people that are passionate about photography who want to instruct, share and/or learn about photography. You are in the right place.
Mar 20, 2017 10:14:26 #
Rongnongno wrote:
When you see the '$25.00 for my work' you will understand my reaction. The first time it was posted correctly but not this time.
This is especially true when you look at what was offered: a ICC printer profile. ICC that needs to be updated every time a different paper is used and the cartridges changed.
This is especially true when you look at what was offered: a ICC printer profile. ICC that needs to be updated every time a different paper is used and the cartridges changed.
Nobody cares what you think. Go take some more overexposed snapshots - that should keep you away from humanity for awhile.
Mar 20, 2017 10:32:29 #
Rongnongno wrote:
When you see the '$25.00 for my work' you will understand my reaction. The first time it was posted correctly but not this time.
This is especially true when you look at what was offered: a ICC printer profile. ICC that needs to be updated every time a different paper is used and the cartridges changed.
This is especially true when you look at what was offered: a ICC printer profile. ICC that needs to be updated every time a different paper is used and the cartridges changed.
Actually Ron is barking up the right tree. When you go to his prior postings which were moved to the classifieds section, you will see that he will send you 7 pages of stuff, along with his color profiles and he wants you to send him $25.00 for this information.
Here is the quote from one of his posts: "I send to you via email 7 pages that you have to print using (of course) your paper, your ink and your printer. You ship them back to me and I create yor custom profile. Then I send it to you via email. You install it in your computer and test it. If you are fully satisfied, then you paid me $25.00 via Paypal. That's it. "
Mar 20, 2017 10:45:52 #
I don't see how this information is acutely important to photographers. Photographers need to know the color wheel of light and that is about all. Color in the digital world is Additive. In other words, if a picture is too blue, you have to ADD yellow to neutralize it. If too red, you ADD cyan. If too green you add magenta. Period.
Mar 20, 2017 10:50:32 #
New printers are so close to giving you the correct colors right out of the box it's not an issue anymore. In my experience most color calibration issues result from improper printer operation and clogged heads.
Mar 20, 2017 14:41:36 #
I had not ever thought about color in this way - that the visible wavelengths are not color but that it is only our retina and brain that bestow color. I look forward to OP's future articles on 'color.' These ideas could be extended to our notions of 'heat' and 'sound,' could they not.
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