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Questions tagged [color]

The tag has no usage guidance.

2
votes
0answers
42 views

How can I draw this style of grid?

I'm trying to write code (in any language) to render this 3D grid, matching the look and colors as closely as possible:
1
vote
1answer
22 views

Converting color to equivalent with opacity

Assume a color X with alpha 1 and RGB 255,230,210. How can i find another color with alpha A ( or an array of colors ) that blended with a background of color Y ( e.g 255,255,255 ) would produce the ...
11
votes
4answers
444 views

For shader math, why should linear RGB keep the gamut of sRGB?

sRGB is often contrasted with "linear RGB." Images are stored on disk and passed to displays in sRGB, which is approximately perceptually uniform in intensity. Shader math is done in linear RGB, ...
3
votes
1answer
60 views

Repeating alpha over/under operation multiple times

I have two RGBA colors in linear [0..1] space, src and dst and I want to alpha blender src ...
2
votes
1answer
36 views

Will sRGB color space get replaced by wider gamut [closed]

in future, will sRGB which is a common standard monitor color space nowadays be taken the place by the wider gamut color spaces? since wide gamut monitor keep publishing in the market and may be ...
4
votes
1answer
47 views

How do I calculate average hue, since the numbers loop around?

If I calculate the average (mean) hue of a set of colours naively, I will get silly answers sometimes. For example, in HSB/HSL, the average of hue=10 (slightly orange red) and hue=350 (slightly blue ...
1
vote
1answer
36 views

How to blend a segment of an image with another image

I want to put a segment of an image to another image. But to make it realistic I applied poisson blending. But the output is not good at all. Output without poisson blending. The kid was cropped ...
2
votes
2answers
97 views

Calculate the average color of an image

I want to calculate the average color+opacity of an image. First I thought about just averaging all ARGB values component-wise, but this got really dark on images with a lot of transparency. I also ...
1
vote
1answer
48 views

Understanding material .mtl files

I am reading this piece of documentation to understand mtl files So far I am stuck trying to understand the difference between ambient, diffuse and specular reflectivity (Ka, Kd, Ks). If I am ...
3
votes
2answers
134 views

Why does _ray_ tracing work?

Perspective projection (or at least non-orthogonal) is by far the most common in photo-realistic graphics. When we use perspective projection, the (equally thick) slices of volume visualized by each ...
1
vote
1answer
41 views

Determine paint color from a photo

I ran into this problem while trying to find the paint color of the doors in my house: is it in principe possible to automatically determine the paint color from a photo? Different types of colour ...
2
votes
1answer
125 views

YUV to HSV to RGB issues

As per this resource, there is an easy way to convert from YCbCr to HSV. Saturation is sqrt(Cb^2 + Cr^2). Now here is my issue. If I take pure red (1,0,0), green(0,1,0), and blue(0,0,1) colors, ...
0
votes
0answers
12 views

Setting the white balance based on a certain color

I have seen multiple approaches to setting automatically the white balance (auto tone). However, I could not find any reference on how to set the white balance with respect to one color (i.e. pick a ...
1
vote
1answer
57 views

Quick 2-color quantization for small images

So I have a small (8x8 pixel) image in 24-bit color. I want to be able to (quickly) generate a color-quantized version of the image that only has two colors. One naive approach is to cluster a luma ...
4
votes
1answer
99 views

Can someone explain this formula for parse RGB to HSL?

Im trying to complain the algorithm to calculate the HSL value form a RGB color. I understand the algorithm for the Hue, but im lost with the Lightness and saturation. Someone can explain why? There ...
1
vote
1answer
42 views

What remedies are there for percieved color artifacts due to pixel geometry?

I have a white line on black background. Because of the pixel geometry the line does not look really white; one edge looks red-isch, the other blue-isch. Other fore- and background yield other ...
1
vote
2answers
104 views

Can I get numeric data from a color map?

In my class I often need to work with color map images. I would show the image and try to make inferences/observations about different subjects. Often times I need to actually quantify some aspects, ...
4
votes
1answer
89 views

Generating and Combining Spectral Colors

I have two somewhat related questions to ask: What is the most accurate way to get the colors of a spectrum, without having to go deep into physics and simulating the universe? ;) Right now, I'm ...
4
votes
1answer
104 views

How do you deal with clipping when rendering to a limited colorspace?

In my naïve raytracer experiment I work internally with RGB values, and after all the tracing has been done, I end up with raw RGB triplets that I need to write down to some image format with a ...
1
vote
1answer
303 views

RGB nonlinear, what does it mean?

What does it mean and why is it not well suited for describing colors by human? Is CMYK nonlinear also?
7
votes
1answer
90 views

What determines the color gamut of a display?

I’m not sure if I’m posting this question in the right area but, I’m wondering what determines the color gamut of a display? Is or hardware down to the RGB filter built into a display like a monitor ...
3
votes
0answers
137 views

Color of the Sky [closed]

What is the color of the sky depending on the time? I'm looking for a set of colors (HTML-Code), the sky has during sunrise, morning, forenoon, noon, afternoon, evening and sunset. A formula to ...
1
vote
1answer
58 views

Extracting the green-screen region borders

Given a png image with an unknown number of green colored (rgba=0, 65535, 0, 65535) regions 1- How can I find and put the border points of only the separate green boxes to an array like: ...
18
votes
5answers
5k views

Why do red, green, and blue make up all the colors?

Why do red, green, and blue combinations can make up all the visible colors?
3
votes
1answer
97 views

How can I implement GIMP's “Colorize” function?

I have an RGB pixel that I'd like to colorize in my program (I'm using GLSL) very similar to how the GIMP "Colors > Colorize" function works. In my program, I can easily convert between RGB and HSV. ...
5
votes
0answers
76 views

How to properly color particles in N body sim?

In my n-body simulation I would like to color the particles in way which corresponds to the magnitude of the net force acting on them. This is so that I can confirm visually that the particles ...
1
vote
0answers
75 views

What causes this color shift?

Below are the original image and a JPEG encoded/decoded image. To my untrained eyes, cyan becomes yellow, yellow becomes magenta, and magenta becomes cyan. Obviously there's a problem with the ...
7
votes
2answers
199 views

Color transform algorithm (that also works on saturation and value/lightness)?

To change particular colors in an image, generally you multiply the RGB by a transformation matrix. Image manipulation programs such as gimp & photoshop have a selective color change function that ...
4
votes
2answers
187 views

Suggested image preprocessing before applying threshold

I am trying to vectorize the contours (skewed rectangle) of the TV in the following original image. My first step is applying threshold. Tried selection of threshold values based on what skimage has ...
1
vote
1answer
173 views

correct rgb or cmyk code from some proportion of cyan, magenta and yellow

I am trying to find a way to go from some proportion of cyan, magenta and yellow where: cyan: 33 % + magenta : 33% + yellow : 33% = 100% black so each is represented as a percentage of the sum ...
4
votes
1answer
131 views

What is the name of the RGB thing I want to be able to do, and what free program(s) can do it automatically?

I'm gonna start this off with an... "indexed image"? If that's the proper term for it? If this 384x144 image were actually only the top-left 192x48 pixels (I'll refer to that portion as "0,0"), I ...
4
votes
2answers
202 views

What are the advantages of having two chroma channels and a luma channel vs. three chroma channels?

RGB has the advantage over schemes like YPBPR in that it's more intuitive to understand, so why use the latter? The only advantage I can think of right now is that it allows you to encode greyscale ...
1
vote
0answers
79 views

Why does this edge detect show different results for the same color combinations?

I'm researching highlighting accessible color contrast via filter operations. I have a test screenshot of SRGB hex values compared with WCAG's official contrast algorithm: I converted it to its ...
7
votes
1answer
841 views

Understanding Jump Flooding Algorithm (JFA) for Voronoi Diagrams

I'm having trouble understanding the JFA. As far as I understood the algorithm, it walks log(n) times through every pixel (no matter if it is a seed or not) and looks at that pixel's neighbors in $(x+...
4
votes
2answers
266 views

Why would a 4d texture be used for color conversion?

You can perform color conversion as a post process step to convert a rendered frame's colors to a different set of colors. You might make darker colors more blue for instance, to give it a night time ...
9
votes
2answers
246 views

What is the most physically accurate representation of color possible in computer graphics?

I am looking for theoretical and implemented models to represent color in software that strives for physical accuracy. I know that "color only exists in the mind" and that it sort of does not make ...
5
votes
1answer
108 views

What is the purpose of this cube in color quantization?

So, I go to install GMIC for Gimp via the package manager and landed myself upon the demo program. I have discovered things such as Hough transform and color quantization. So, I get the number of ...
9
votes
2answers
752 views

What is a good color similarity metric?

I have some colors in RGB in [0,1] and want to find a way to rate their similarity, as perceived by a human. I have two ideas in mind, but I am sure there are other options as well, but am unsure ...
4
votes
2answers
169 views

Can I have lower color bit depth in sample buffer than target framebuffer?

I´m looking into uses of high amount of samples in multisampling. If I have an RGBA8 framebuffer and render to it using multisample with many samples, say 32, dithering on per-sample level should ...
6
votes
2answers
185 views

Calculate an equally bright grey to a linear RGB colour

I'm trying to get a grey linear-RGB-triple that is equally bright as another (colorful) RGB-triple. I have to admit, that there is great confusion for me with all the color stuff, even though I read ...
4
votes
1answer
180 views

What graphics techniques can be used to simulate a color nebula effect?

I've been playing around with more advanced graphics these days (beyond the basic 2D UI and image effects that the iOS platform offers), and I'm wanting to implement a visual effect similar to how iOS'...
4
votes
1answer
104 views

Preserving luminance

I am writing an application with multiple colored surfaces. I would like to preserve luminance, i.e. a blue surface would appear as bright as a green one, are there tools to help for this?
8
votes
2answers
152 views

Encode two R11G11B10F buffers into one using Y'CbCr?

We are trying to optimize Lighting in fillrate. Integrated graphics chips are very slow in memory access. There are two Light Buffers: one for Diffuse and one for Specular. Both use format R11G11B10F....
5
votes
1answer
1k views

Confusion between usages of linear RGB and sRGB

Suppose you have generated an image using linear values for RGB channels. E.g. you linearly interpolated it when doing blending, etc.. When you're going to present this on the screen, should the ...
7
votes
1answer
242 views

How to correctly render visible spectrum with uniform intensity?

I'm trying to get the correct representation of visible spectrum to render on the screen. My current progress is with using CIE 1931 standard observer color matching functions analytically ...
7
votes
1answer
564 views

How much precision (half, float, double, etc) is enough for a Color class?

While doing some reading on how real-time applications handle color under OpneGL, I noticed that some examples implemented Color as a collection of 4 floats, while ...
5
votes
1answer
164 views

How can you interpolate over an array of say 5 colors?

I have an array of color values. I have an interpolating parameter, t, which varies from 0 to ...
9
votes
1answer
846 views

Why does checkerboard pattern on a computer screen appear with a yellowish tint?

This question was originally asked on Physics, then moved to Cognitive Sciences. Consider the following image: You might want to display the image in a new page, in case it gets resized for mobile ...
1
vote
1answer
39 views

Fading an object in add mode with correct color math

I have a scene rendered entirely with objects with additive blend mode. I have a value that is oscillating from 0, to 1. When it is 1 the object is supposed to be invisible, 0 should be entirely ...
5
votes
1answer
809 views

Is there a way to interpolate color across the line with only integer calculation ?`

Here is my function that does interpolation ...