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68 votes
Accepted

Why is TV static noise always black and white?

The color burst is also an indicator that there is a color signal. This is for compatibility with black and white signals. No color burst means B&W signal, so only decode the luminance signal (no ...
Juancho's user avatar
  • 5,026
27 votes

Why is TV static noise always black and white?

In the absence of a valid color burst signal, the "color killer" circuit disables the color difference signals, otherwise you would indeed see colored noise. This is mainly intended for displaying ...
StessenJ's user avatar
  • 371
18 votes

Why color is coded with two numbers rather than one?

Note: also check out the comments for more pointers. I'll assume that you think of wavelengths, or hue and saturation, which is why you think you could maybe represent color as a single value. You ...
Christoph Rackwitz's user avatar
6 votes

What Is the Difference Between the Terms Color Intensity and Color Saturation?

Saturation mixes the original color with white to make varying degrees of pastel color. Intensity/Value mixes the above color with black to make varying degrees of brightness. if you raise the value ...
bandybabboon's user avatar
6 votes

Why color is coded with two numbers rather than one?

Color spaces are represented by three numbers (not two). That's a direct consequences of the human visual system. Humans have three different type of color receptors in their eyes. Their spectral ...
Hilmar's user avatar
  • 45.3k
5 votes

what does it mean to have a decorrelated colour space?

edit: to be clear this answer describes why Lab can be described as a decorrelated color space. This does not imply that decorrelation is the main benefit of using Lab (see many answers on why Lab is ...
Chandler's user avatar
  • 204
5 votes
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Calculating colour temperature from two sources of varying luminous intensity

LEDs do not emit black-body (Planckian) radiation which has a specific spectrum, so instead of color temperature which concerns black-body radiators we have to resort to correlated color temperature (...
Olli Niemitalo's user avatar
4 votes

What Is the Difference Between the Terms Color Intensity and Color Saturation?

When you take an RGB Image matrix and convert the color into HSV Color Model the color is represented on Cylinder. Now, the intensity (Lightness / Value) is the height on this Cylinder which is going ...
Royi's user avatar
  • 19.7k
4 votes
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Are There Good Methods for Converting Color Image to Gray Scale Image?

There are method which are called Contrast Preserving Decolorization. Those methods are built to keep the contrast in the Color image in the converted image. They are based on Optimization Problem ...
Royi's user avatar
  • 19.7k
4 votes
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What do the L, M and S pixel values in the LMS color space stand for exactly?

Colors specified in CIE LMS don't have more or less meaning than colors specified in other CIE based color spaces. CIE LMS coordinates can be readily transformed between CIE XYZ, CIE LAB etc using ...
Chandler's user avatar
  • 204
4 votes

How to choose the most appropriate color space for a computer vision application?

Computer vision is a huge topic and your particular example (statistical color transfer) is too narrow to provide guidance on the remaning parts. That being said, classically most algorithms have ...
Fat32's user avatar
  • 28.3k
4 votes

Why is TV static noise always black and white?

In PAL, the colour information (chrominance or chroma) is modulated onto the black and white (luminance or luma) baseband signal. The chroma is at ~4.4MHz offset from DC and is about 1.3 MHz wide. ...
Roger Lucas's user avatar
4 votes

what is the difference between YUV format and HSV format?

So the best discussion I can point to is in this PDF on Charles Poynton's site. The PDF goes on to much more detailed explanations of each color space, and how to convert between them. It's a bit ...
Peter K.'s user avatar
  • 25.8k
4 votes

what is the difference between YUV format and HSV format?

YUV is basically a member of the television broadcast industry video/image color encoding formats, and was created during the transition of black & white broadcast into color. A backwards (B&W)...
Fat32's user avatar
  • 28.3k
4 votes

Why color is coded with two numbers rather than one?

Even if you abstract away the brightness of a light, and leave only the color information, you are left with two coordinates. Take the CIE xyY diagram as an example, where Y represents the brigthness ...
Justme's user avatar
  • 2,303
3 votes

What is the relationship between luminosity of Lab color space and intensity of HSI color space?

According to Poynton’s FAQ, Intensity is a measure over some interval of the electromagnetic spectrum of the flow of power. Lighntess is the perceptual response to luminance (which is radiant power ...
Cris Luengo's user avatar
  • 2,584
3 votes

Are There Good Methods for Converting Color Image to Gray Scale Image?

This is a crucial question. You are evoking the standard linear transformations. There is a rich literature on the topic, you can for instance with: Ford and Roberts, 1998: Colour Space Conversions ...
Laurent Duval's user avatar
3 votes
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How to Reverse Color Quantization?

Are there any algorithms that, for example, take neighboring pixels into consideration in order to determine a better estimation for each pixel? That would essentially be a low-pass filter. So, yes, ...
Marcus Müller's user avatar
3 votes
Accepted

Correct color values on image taken with no infrared filter

Unfortunately, no practically known signal processing method could provide what you wanted yet. Instead, you must use a hardware optical IR filter that would block the incoming IR waves, before they ...
Fat32's user avatar
  • 28.3k
3 votes

What Is the Difference Between the Terms Color Intensity and Color Saturation?

For 24-bit RGB colors: R=1,G=0,B=0 would be maximally saturated (100%) red, but at the lowest intensity. R=255,G=254,B=254 would be very high intensity, but very low saturation (most people wouldn't ...
hotpaw2's user avatar
  • 35.4k
3 votes

What Is the Difference Between the Terms Color Intensity and Color Saturation?

Saturation is usually one property of three when used to determine a certain color and measured as percentage value. Saturation defines a range from pure color (100%) to gray (0%) at a constant ...
Behind The Sciences's user avatar
3 votes
Accepted

What Is the Algorithm Behind Photoshop's "Black and White" Adjustment Layer?

I replicated the algorithm perfectly in MATLAB (Based on @Ivan Kuckir answer): ...
Royi's user avatar
  • 19.7k
3 votes

Why does the Y component in YCbCr represent luma/intensity?

Focus on the first equation for EY. Back in the day when color television was being developed, the color signal had to be compatible with black and white TVs and vice versa. So the compatible ...
Justme's user avatar
  • 2,303
3 votes

Restore RGB Values from Luminance Value?

No, because luminance is a weighted sum of RGB components and has no color information, so it is greyscale only.
Justme's user avatar
  • 2,303
3 votes
Accepted

Simulate chromatic filter on RGB image

My answer is based on Fast RGB to Spectrum Conversion for Reflectances. As there are only 3 degrees of freedom (DOF) in an RGB data file and there are effectively infinite DOF in a continuous spectrum ...
GrapefruitIsAwesome's user avatar
2 votes

How to make color balance of photoshop using opencv

OpenCV don't have any apis to separate data into lowlight,midtones and highlights.But you can categorize pixels in image into shadows,mid-tones and highlights by setting some thresholds.As they depend ...
Navin Prashath's user avatar
2 votes

What Is the Difference Between the Terms Color Intensity and Color Saturation?

Where did you get the term 'colour intensity'? If by that you mean 'colourfulness' as distinct from saturation, this might be of help: http://munsell.com/color-blog/difference-chroma-saturation/ "...
Brett Harrison's user avatar
2 votes
Accepted

`SSIM(YUV)` vs. `SSIM(Y)`: Values Are Very Different

I figured it out: the ssim() function in MATLAB, does not handle RGB images, but instead threats it as a 3D-image (with the third dimension time for example, to ...
Martijn Courteaux's user avatar
2 votes

Why is TV static noise always black and white?

To add to the existing answers, PAL corrects for color errors by reversing the color component of each line in the next one, which cancels out color errors and should also reduce the color component ...
Konrad Höffner's user avatar
2 votes
Accepted

which are saturation and intensity images in this figure?

When the text refers to Hue component image, it is to represent what hue value these colors hold, not an actual picture in the text. When the text says H is shown in figure b, it means the numerical ...
Jake's user avatar
  • 336

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