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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RGB adjustment for monitor RGB difference

Ok so, I have a color wife want to paint a room that we found on google on home computer. The color is RGB-(113, 121, 126) the color does not match phone RGB value because monitor RGB value is not ...
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6 votes
1 answer
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Why is the screen blend mode named 'screen'?

I am studying blend modes and I am comfortable with pixels, channels and math equations. I understand that the screen blend mode is calculated as 1 - (1 - c1) * (1 - c2), where c1 and c2 are the ...
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How do I calculat luminous intensity (candela) using python?

I'm working on my graduation project which takes the subject of brightness adjustement of switchs using embedded system (python +Raspberry ) i want to determine the candela value from a picture taken ...
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6 answers
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Why is CMYK more efficient/beneficial than RGB for performing printing operation on white paper?

We know that CMYK is subtractive color model and RGB is additive color model.If we make 3D( R: x-axis, G: y-axis, B: z-axis) cube for RGB it starts with darkness (black) and we gradually add light; an ...
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Why do red, green, and blue led ring collars appear RGB visually but white in a photograph on my dog [duplicate]

I put separate red, green, and blue led ring collars on my dog. Visually my eyes see each color and collar. A photograph, however, shows only a blur of white light. What causes this?
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5 answers
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Why is an overexposured-area white?

From what I understand, camera sensor photosites have 'filters' on them so that each can receive only either red, blue or green light. Example: When there is an overexposure of only pure blue light, ...
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Does colour mixing work with other sets of three colours?

Fellow photographers and I were discussing how to create a positive colour image by overlaying three film BW negatives/positives that were shot using the trichrome process, using three colour filters ...
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Why does light-colored skin look different in black and white versus digitally desaturated versions of color originals

One friend, who was a photographer, commented that a desaturated photograph of light-skinned people looks like they have a suntan compared to a true black and white picture of the same skin, and ...
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4 answers
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What distinguishes natural photos from filtered ones (color theory)?

I have implemented a filter which makes use of RGB color space plus some transformation functions. This filter can be seen here in action. The natural image is obvious to me. // Natural Image // ...
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4 votes
3 answers
133 views

color spaces and monitors

What happens when retouch an AdobeRGB image in a monitor that only displays sRGB? I normally work on AdobeRGB mode and on a monitor that displays this color space. However, I am going to be using an ...
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Which color model to use while editing photos? RGB? Or some else?

I want to shoot few photos using smartphone. Nature, landscapes. From smartphone I will receive JPEGs, RGB. I will trasfer them to computer. Next step I will convert them to TIFFs. Next step I will ...
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What change does tone curve make in pixels in a colored image in Photoshop and Lightroom? [duplicate]

As I understand it, when I make a change in the tone curve in Adobe Photoshop (or Lightroom) and have selected the RGB Channel option, the following happens: For every pixel in the image, if any of ...
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5 votes
3 answers
380 views

Why does Photoshop Curves in 16 bit color depth still use tonal range 0 - 255?

I am wondering why does Photoshop use tonal values in range 0 - 255 while i'm working on an image of 16 bit bit depth, because in this case each color channel doesn't use 256 tonal values but 65536. ...
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2 votes
1 answer
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What is the difference between Photoshop RGB Curve and Lightroom RGB Tone Curve?

I am very confused with the following situation, let's say we have an image with two colors: (RGB 0,60,60) and (RGB 255,0,0). I have noticed that the tone curve in Adobe Lightroom works differently ...
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Do CEIL LAB images look really the same on all monitors?

Monitors can show only RGB models, which has different values on different settings of the monitor. CEIL LAB was designed to be device independent, however I have a confusion that essentially the ...
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What is the normal process for a photographer to get their photo into CMYK format?

I am an aspiring photographer. I take pictures that I want printed in CMYK for a magazine. Do I have to take the photo, and then painfully convert the rgb photo to cmyk? Is there no out of the box ...
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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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2 votes
2 answers
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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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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 ...
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2 votes
1 answer
979 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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1 vote
2 answers
223 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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1 vote
2 answers
191 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 ...
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2 answers
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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 ...
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49 votes
8 answers
17k 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 ...
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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?
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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 ...
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3 answers
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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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1 answer
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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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3 answers
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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....
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3 votes
3 answers
10k 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 ...
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6 votes
4 answers
1k 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 ...
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1 answer
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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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3 answers
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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 ...
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5 votes
1 answer
171 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 ...
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4 votes
2 answers
36k 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?...
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3 answers
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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 ...
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2 votes
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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 ?
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3 votes
1 answer
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RGB to CMYK in Photoshop without ICC?

Is it possible to convert an RGB image to CMYK without an ICC profile?
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15 votes
2 answers
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 ...
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10 votes
4 answers
7k 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 ...
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17 votes
4 answers
5k views

Are RGB numeric values equal to CMYK percentages?

are RGB numeric values equal to CMYK percentages?
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