Questions about the different ways color can be quantified and indexed, like for example GRB, CMYK, Lab or HSB. Also applicable to questions about communicatin between different color spaces.

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3
votes
1answer
26 views

How large are the HSL/HSV colour spaces with respect to Lab?

I could find numerous resources that specify how colour spaces such as RGB, sRGB and CMYK cover a part of the CIE XYZ Lab colour space. I could find numerous graphics displaying the RGB and CMYK ...
1
vote
1answer
39 views

A quick and reliable test for linear a nonlinear color response with a given application / hardware?

There is an insane amount of confusion between linear and non linear response to color mappings, it depends on the drivers, the software, the hardware, the settings in your applications, what kind of ...
1
vote
0answers
62 views

What makes a matte color? [closed]

Is there a way to measure how matte a color is? My guess is that "matteness" could be expressed as a combination of saturation and lightness. Ideally, there would be a color space where matteness ...
0
votes
0answers
39 views

Why are two different CMYK colors printed equally?

With Inkscape, I drew two rectangles, one with CYMK 20/100/0/0 and the other with 2/56/0/43. Since those two colors are different in the CMYK color space, I expected them to print in different colors. ...
4
votes
1answer
670 views

Should I use Hex or RGBA when designing a website?

I know this has appeared on StackOverflow already: Are there any good reasons for using hex over decimal for RGB colour values in CSS? Use HEX or RGBA But I'd like to ask on here since we're ...
0
votes
0answers
56 views

Illustrator changes colors over several days?

I'm working on a web project from a few days ago and every time I open the Illustrator to continue working following day, the colors went much darker. And the colors that I didn't touched from the ...
0
votes
1answer
146 views

How to convert RGB to CMYK color code?

I want to convert RGB to CMYK color code, but unfortunately, I have some problem with colors. I want to use this color #31C68B in Photoshop, and after that I want to print that for Visit Card and the ...
0
votes
1answer
60 views

Why does the color model still matter?

In applications like inDesign and Photoshop, you get to chose which color model you want to use, RGB or CMYK for instance. But why does this matter? Both RGB and CMYK can be used to describe several ...
11
votes
6answers
2k views

How to convert from RGB to real life paint colors?

How can I convert an RGB color into a real life color? E.g. if I take equal amounts of red, green and blue paint in real life I will never obtain the white color or some shade of grey. Looking at an ...
1
vote
1answer
89 views

Choosing appropriate text color with given background

I have an image with green background, lets say #5F7642. I need to add small text in red color over that background. The problem is, usual red colors pretty much fade in with the background. I need ...
2
votes
1answer
92 views

Global color settings for illustrator / keeps switching to gray

Is there a setting in illustrator that will make all of my colors, in all new projects, RGB? I'm not really sure why it often ends up as grayscale. I only use RGB for web assets and having to change ...
0
votes
1answer
118 views

Interpreting color function and adjusting pixels values

Here is the definition which I read from the net source 1st is Midtone: Situated between the darkest tone (Black), and the brightest tone (White). For a 24 bit colour image, this occurs when ...
1
vote
2answers
107 views

Is there a printing press that can print a book directly from the RGB space?

I have a book ready for printing. But, of course, it was done in RGB. In fact, I stretched the RGB gamut beyond its normal range in order to make it more painterly etc. When I saw it converted to ...
1
vote
2answers
519 views

Open source software to reduce colours to custom optimised palette (quantize) (for paint-by-numbers)

I want to manipulate a photo so that the number of colours is reduced significantly (to say 15-50 colours which I would specify the number). I would like those colours to be automatically optimised ...
1
vote
2answers
7k views

Illustrator: only get grayscale when applying colors

After tracing a jpeg image in Illustrator and expanding it, when I try to change its color, it becomes gray. I have tried lots of color change but the result is same. How can I change the trace ...
1
vote
0answers
30 views

How to get CMYK colors on screen to match newsprint [duplicate]

I work at with ads in PDF format at a newspaper. Before exporting, I always convert all the colors to CMYK, however when we get the paper back from the printer, the newsprint color hardly match the ...
1
vote
1answer
104 views

The black and white photos in the Proof Copy of my book are washed out and without blacks

The black and white photos in the Proof Copy of my book (non-coated paper) are washed out and have no deep blacks, or hardly any blacks. Working from InDesign to a PDF file, how do I ensure that my ...
0
votes
0answers
210 views

Photoshop - Difference between two images

I will try to explain my problem in few words. I have an image representing a person. Thanks to my code I manage to compute the background subtraction and have the resulting shape of the person in HSV ...
3
votes
2answers
810 views

Antonym of Pastel Color Space (Color Scheme?)

In color spaces we have the regular solid colors like solid red (#FF0000), solid green, solid blue, etc. ... Then when we add about 50% white ontop of it, it becomes a "pastel" color space... What ...
2
votes
3answers
335 views

RGB to CMYK conversion — more than one way?

Occasionally a science journal asks authors to submit figures as CMYK (JPG or TIFF) for publication. When I have done this in the past, the colors in the figures end up looking very muted and washed ...
3
votes
1answer
151 views

How can I set CMYK values in Scribus?

When I create a new CMYK color for my document, the color’s values change when I edit it back, as you can see in this animation (sorry for the bad quality): For example: 65,00% becomes 65,10% ...
5
votes
1answer
506 views

What ICC profiles does Adobe Illustrator use to convert between RGB and CMYK in its color picker?

I'm trying to understand Adobe Illustrator's color conversion method between RGB/HSB and CMYK. I'm pretty sure they use ICC profiles to do the conversion, and they make a bunch of ICC profiles ...
9
votes
2answers
4k views

What's the difference between Monitor RGB and sRGB?

Since the output is web, RGB is choosen, but is there any difference between "Monitor RGB..." and "sRGB..."? In Photoshop, they are both under color settings > working spaces > RGB
4
votes
3answers
193 views

Should I scale an image first, or index it?

I have an image, it's the Backtrack_5_PitchBlack.jpg found at http://www.backtrack-linux.org/screenshots/, and I'd like to get it down to 640*480 for a Grub4DOS splash screen. Unfortunately, this also ...
3
votes
1answer
395 views

How to get RYB complementary colors in RGB imaging software

I am looking for a way to get RYB complementary colors in software. This means, complementary color pairs I am looking to get would be: red - green yellow - violet blue - orange However, when ...
7
votes
2answers
648 views

How do you avoid bands of prominent color in gradients?

So this is more scientific visualization than graphic design, but I think the theory is the same. In colormaps used for visualizing data, there are often bands of color that stick out when they ...
7
votes
1answer
128 views

Is there a metric for “apparent” chroma?

I'm not sure this is the right place to ask, but is anyone aware of a metric for apparent chroma? Now I understand that "chroma" and "chrominance" are very overloaded terms, so to clarify, I ...
2
votes
1answer
4k views

Tools to convert from 16-bit RGB to 24-bit RGB and vice versa

Are there any image editing or research tools, commercial or otherwise which will allow me to: map colors (images) from 16-bit RGB (565) space to 24-bit RGB (888) space or vice versa save files in ...
2
votes
1answer
3k views

Photoshop: Should I use my monitor's color profile (under proof setup/colors) when designing for desktop?

The title says most of it...not sure whether I should set Photoshop to Monitor RGB color profile and set "show proof colors" to true when working on desktop layouts. I notice that Firefox uses my ...
1
vote
3answers
808 views

Laptop screen for digital design

I am searching for a laptop with a screen that is suitable for digital design purposes What I am particularly concerned about is a statement made by a poster (on here): (the objective is to) make ...
3
votes
1answer
85 views

Perceptual colour space as working space

We know from after images that violet-yellow, blue-orange and green-magenta are perceptual complementaries. When I am designing I would like a hue wheel that reflects these perceptual ...
15
votes
8answers
6k views

RGB and CMYK: Why both?

Any of you who have at least little experience with graphic design software, photography or professional printing, must have -almost undoubtedly- have gone through this: 'the struggle' of RGB and CMYK ...
5
votes
1answer
156 views

Color loss during colorspace conversions

Why are conversions from a smaller colorspace to a "larger" one often lossy? How can a smaller gamut have colors that cannot be represented in a larger (overlapping) gamut?
2
votes
2answers
168 views

Photoshop Relative Colormetric conversion inconsistent?

The Photoshop relative colormetric conversion seems to be inconsistent. I'm converting from Adobe RGB to sRGB. Settings are as follows: I open the same file twice and run the same conversion. The ...
2
votes
2answers
21k views

Indesign RGB color space

Is there a way to set the colorspace to sRGB in indesign? I remember doing this in indesign cs3 years ago and i can't recall how to do this for cs5.
9
votes
2answers
2k views

How to calculate other colors with the same perceived lightness as a given gray value?

This is related to a question I asked on tex.stackexchange, which has a color aspect. The result of that question is the following image: I have drawn a series of gray squares on the left, with a ...
8
votes
3answers
2k views

Choosing colors that work well on projectors

When specifying colors for use in a software user interface, what's the best way to ensure that those colors will look acceptable on all common display technologies: CRT, LCD, and in particular ...
7
votes
4answers
2k views

how to keep printed documents accurate color reproduction

Is there a way to widen the gamut of a cmyk print so that the darks stay dark and the lights stay light? I suspect it has something to do with color space being exported, but I don't know how to ...
31
votes
9answers
15k views

What is the difference between CMYK and RGB? Are there other color spaces I should know?

I'm a photographer, who dabbles in graphic design from time to time as well. What are the differences between the various color spaces?
6
votes
2answers
3k views

Why are colors shifting when converting from CMYK to RGB in Photoshop?

I have an image that is CMYK and I have tried to convert it to RGB so that I can edit the colour of the image. However it won't let me work in 32 bit and asks me to convert the image to 16 or 8 bit to ...