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Questions tagged [rgb]

RGB stands for Red-Green-Blue and specifies a color using three values, which represent the respective amount of red, green, and blue in the color. RGB is the basis for the color model used by most color display devices nowadays.

The RGB color model is an additive color model in which red, green, and blue light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three additive primary colors, red, green, and blue. RGB is a color notation used in most computing devices nowadays.

RGB colors are represented by a tuple of three values (one per primary color), which are typically either bytes ranging from 0 to 255 or floating-point values ranging from 0.0 to 1.0.

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RGB to hex and hex to RGB

How to convert colors in RGB format to hex format and vice versa? For example, convert '#0080C0' to (0, 128, 192).
Sindar
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Formula to determine perceived brightness of RGB color

I'm looking for some kind of formula or algorithm to determine the brightness of a color given the RGB values. I know it can't be as simple as adding the RGB values together and having higher sums be brighter, but I'm kind of at a loss as to where…
robmerica
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HSL to RGB color conversion

I am looking for an algorithm to convert between HSL color to RGB. It seems to me that HSL is not very widely used so I am not having much luck searching for a converter.
hhafez
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libpng warning: iCCP: known incorrect sRGB profile

I'm trying to load a PNG image using SDL but the program doesn't work and this error appears in the console libpng warning: iCCP: known incorrect sRGB profile Why does this warning appear? What should I do to solve this problem?
Omid Karami
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How to compare two colors for similarity/difference

I want to design a program that can help me assess between 5 pre-defined colors which one is more similar to a variable color, and with what percentage. The thing is that I don't know how to do that manually step by step. So it is even more…
Ana Fernandes
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How to get hex color value rather than RGB value?

Using the following jQuery will get the RGB value of an element's background color: $('#selector').css('backgroundColor'); Is there a way to get the hex value rather than the RGB?
jason
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How to read the RGB value of a given pixel in Python?

If I open an image with open("image.jpg"), how can I get the RGB values of a pixel assuming I have the coordinates of the pixel? Then, how can I do the reverse of this? Starting with a blank graphic, 'write' a pixel with a certain RGB value? I would…
Josh Hunt
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Given an RGB value, how do I create a tint (or shade)?

Given an RGB value, like 168, 0, 255, how do I create tints (make it lighter) and shades (make it darker) of the color?
DenaliHardtail
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Converting an RGB color tuple to a hexidecimal string

I need to convert (0, 128, 64) to something like this "#008040". I'm not sure what to call the latter, making searching difficult.
rectangletangle
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Convert System.Drawing.Color to RGB and Hex Value

Using C# I was trying to develop the following two. The way I am doing it may have some problem and need your kind advice. In addition, I dont know whether there is any existing method to do the same. private static String…
Nazmul
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Converting RGB to grayscale/intensity

When converting from RGB to grayscale, it is said that specific weights to channels R, G, and B ought to be applied. These weights are: 0.2989, 0.5870, 0.1140. It is said that the reason for this is different human perception/sensibility towards…
ypnos
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Converting Hex to RGB value in Python

Working off Jeremy's response here: Converting hex color to RGB and vice-versa I was able to get a python program to convert preset colour hex codes (example #B4FBB8), however from an end-user perspective we can't ask people to edit code & run from…
Julian White
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Convert light frequency to RGB?

Does anyone know of any formula for converting a light frequency to an RGB value?
Shaul Behr
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Get pixel's RGB using PIL

Is it possible to get the RGB color of a pixel using PIL? I'm using this code: im = Image.open("image.gif") pix = im.load() print(pix[1,1]) However, it only outputs a number (e.g. 0 or 1) and not three numbers (e.g. 60,60,60 for R,G,B). I guess I'm…
GermainZ
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What are the practical differences when working with colors in a linear vs. a non-linear RGB space?

What is the basic property of a linear RGB space and what is the fundamental property of a non-linear one? When talking about the values inside each channel in those 8 (or more) bits, what changes? In OpenGL, colors are 3+1 values, and with this i…
Ken
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