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Questions tagged [rgb]

an additive color model using the primary colors red, green and blue to reproduce a wide range of colors.

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1answer
120 views

How to compress RAW RGB 10-bit data?

This might seem like a general question, however I could not find an answer for. Specifically, I am using a CMOS image sensor that has the following general capabilities: Array Size: 1280 x 1024 (...
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2answers
79 views

How did color spaces get their names?

Why RGB instead of BGR, GBR or perhaps GRB? Why CMYK instead of YMCK, KMCY, CKMY, YKMC and etc?
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1answer
126 views

Linear regression to correct the colors of RGB images?

I have several pictures of plants (tif files). Each picture contains a set of Munsell color chips. The "true" RGB values of the Munsell color chips are known. My goal is to correct the colors of the ...
2
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1answer
328 views

How to change saturation on a curve in RGB mode, in Photoshop?

In Lab mode it's easy to change saturation independently of luminosity, by using curves on the a and b channels, but how can you do it in RGB mode? In RGB mode it's still easy to change luminosity ...
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2answers
123 views

Color Calibration on Sharp LC-32LB370U monitor

I'm having trouble trying to fix the color for my Sharp LED monitor. This has been an issue for about a year or so, and I'd still like to use it, but the wrong colors are too distracting. I've gone ...
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2answers
138 views

Why do color channels from a digital camera respond slightly to lights of other colors?

I'm trying high speed dark room photography with Logitec c270 simple CMOS web camera. I flash red or blue light and capture frames. Then I separate it to channels in photoshop. There, I can see all ...
5
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2answers
978 views

Filter for RGB separation and its effect on the image

Looking at Bayer filter of a typical consumer camera, one can easily see that sensitivity of the filter for each color is all over the place. Are there filters similar to Bayer that do a better job at ...
47
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8answers
15k views

Why do we use RGB instead of wavelengths to represent colours?

As we know, the colour of a particular beam of light depends on its frequency (or wavelength). Also, isn't that the information which is first captured by digital cameras? Then, why do we use formats ...
0
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2answers
696 views

How to color correct using known RGB values of a single pixel?

I have a photo and I know what RGB coordinates a pixel in that photo should actually have. Based on that information, how do I correct the entire photo?
1
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1answer
143 views

Difference between a “camera at three broad spectral bands” (sic.) and a standard RGB camera?

I am doing a research that involves aerial photography, specifically forest surveying. In one paper, "Automated tree crown delineation from imagery based on morphological techniques", I found this ...
4
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3answers
1k views

Can all colors be described with RGB?

If one could pick ideal sensitivities for the RGB filters of a camera sensor, would it be possible to capture any color as humans see it?
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1answer
255 views

Humanae pantone colors to RGB conversion

How to find the RGB color codes for the humanae project-humanae link. It uses pantone colors, but the codes given in the website at humanae couldnt be found on pantone color finder at pantone-color ...
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2answers
790 views

How can I simulate a bayer filter (or just RGB channels) using photoshop layers?

I can copy the red, green, and blue channels in an image and make them layers. What I'm after is to have a document with 3 layers... one representing the red channel, one for green, another for blue....
3
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3answers
7k views

What's the best method to change colours in a photo to another specific color?

What is the best way to change the colours in a photo to a specific colour? Specifically, how can we change the colours using Curves or Levels Layer? Here are few examples for understanding: orange ...
6
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4answers
978 views

Why don't cameras capture using the CIE XYZ color model?

If the CIE XYZ color model is a better representation of what humans see, then why don't CCD arrays in cameras capture data in a way that maps to it rather than the RGB model? It seems especially ...
1
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1answer
1k views

When to use LUV and not RGB colourspaces

Some applications extract information from images in the LUV colour space and not directly from the more commonly used RGB. Why is that?
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3answers
8k views

Can I do “back conversion” of a B&W JPEG to color?

I have a black and white JPEG. It is in fact an RGB image, which means that the color is still there. And I know from past experience that when I shoot B&W with my Canon, the color image is still ...
5
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1answer
136 views

How to minimise the noise in colour values when moving between colour spaces?

Let's say I was to change from RGB to HSV using a software like Matlab and then convert the result back to RGB using the same software. I know that there are going to be some slight noise and error in ...
3
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2answers
23k views

How do I set the RGB values of my monitor to match 6000K for calibration?

I've read that the Kelvin temperature for my screens should be around 6000K but I only have RGB values for adjusting the colors. Does anyone know what would be the best R, G, B values that match 6000K?...
4
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3answers
1k views

What are the RGB primaries in a camera?

More generally, what is the nature of the gamut? Primaries as peak sensitivity don't behave the same as primaries for mixing output. I suppose this is necessary to know for RAW importing and would be ...
2
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2answers
220 views

What combination of R, G, B lasers will give “White” with a given °K temperature?

Would it be possible to get a "white" lighting of a subject by using 3 different lasers (R, G and B) If so, which wavelengths and proportions should be used ?
3
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1answer
669 views

RGB to CMYK in Photoshop without ICC?

Is it possible to convert an RGB image to CMYK without an ICC profile?
15
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2answers
3k views

How do I interpret individual colors on RGB histogram?

I know how to read the Luminosity histogram and I thought that I knew how to read RGB histogram as well, until I saw the following example: The RGB histogram shows exactly the same 3 'spikes'. What ...
8
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4answers
5k views

Is there a lossless sRGB to CMYK conversion?

In my quest to print large images, I discovered that most such places, as opposed to photo labs, only accept CMYK images. While I consider myself an image processing expert, I realize there is a ...
18
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4answers
4k views

Are RGB numeric values equal to CMYK percentages?

are RGB numeric values equal to CMYK percentages?