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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35
votes
10answers
24k 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?
19
votes
8answers
8k 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 ...
13
votes
7answers
11k views

How to convert RGB colors into real paint colors?

How can I convert an RGB color into a real life color? If I mix equal amounts of red, green and blue paint together in real life, I will never achieve a white color, in the way you do when setting ...
10
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 ...
9
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 ...
9
votes
2answers
8k 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
9
votes
1answer
903 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 ...
8
votes
1answer
463 views

What is six-color (6C) process printing?

What is 6 color printing, is it multicolor process printing? What setting do I have to keep in Photoshop, Do I have to create an extra channel in the channel palette?
8
votes
2answers
940 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
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 ...
7
votes
2answers
4k 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 ...
7
votes
1answer
152 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 ...
5
votes
1answer
162 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?
5
votes
1answer
96 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 ...
4
votes
3answers
234 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 ...
4
votes
2answers
1k 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 ...
4
votes
0answers
46 views

Embed color profile into a PDF with Inkscape

I'm using Inkscape v. 0.91 under Linux Slackware, compiled from the source with the default options. The printing service I use requires the "ISO Coated v2 300% (ECI)" color profile, which I have in ...
3
votes
2answers
26k views

Why am I only getting grayscales / monotones when applying colors in Adobe Illustrator?

When I try to change the color after tracing a JPEG image in Illustrator and expanding it, it becomes gray. I have tried lots of color changes but the result is always the same. Why can't I change ...
3
votes
2answers
32k 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.
3
votes
1answer
207 views

How to create a color of the same brightness and saturation?

Let's consider three colors: Red, Green and Blue. For blue I created a specific shade, something like #F2F5F7. If you see this color, it has a certain level of shade, brightness and saturation value ...
3
votes
2answers
2k 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 ...
3
votes
3answers
98 views

Why can't I just download a premade color profile from the internet for my monitor?

Shouldn't the manufacturer of my monitor already know how it differs from the standard?
3
votes
1answer
530 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 ...
3
votes
2answers
140 views

Do designers use different color palettes for web and print design?

I'm designing a brand for a startup company, (new to freelancing) and I'm trying to make my color choices suitable for printed documents as well as displaying them on web. Using Illustrator (doc in ...
3
votes
1answer
200 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% ...
3
votes
1answer
90 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 ...
2
votes
1answer
7k 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
447 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 ...
2
votes
2answers
175 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
1answer
5k 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 ...
2
votes
1answer
168 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
3answers
449 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 ...
1
vote
2answers
171 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
1k 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
56 views

Color not transferring from Illustrator to Photoshop [closed]

I have an Illustrator file and a Photoshop file, both are setup as RBG color spaces. But when I copy and past from Illustrator to Photoshop the color changes. For example #b74eab becomes #a6349b. I ...
1
vote
1answer
52 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
3answers
975 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 ...
1
vote
2answers
134 views

Can I display CMYK in RGB format easily?

When designing for print I obviously use CMYK, however I'm always a bit unsure of how colours will turn out because monitors work on RGB so the colour you are seeing may not be representative of how ...
1
vote
1answer
143 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 ...
1
vote
0answers
91 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 ...
1
vote
0answers
34 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 ...
0
votes
1answer
106 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 ...
0
votes
2answers
130 views

Finding intermediate colours between two xyY colour points

I am working in an application where I need to know the intermediate points between two xy coordinates in CIE 1931 colour space. In the picture below we can see that a linear transition (straight ...
0
votes
1answer
480 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
679 views

How can I correctly convert a CMYK Photoshop PDF to sRGB?

I'm working with an artist to create a comic, which will be printed eventually, but which is currently being serialized online. The artist is working in CMYK in Photoshop, on the theory that it's ...
0
votes
1answer
173 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 ...
0
votes
1answer
27 views

Why are Pantone Color Bridge (UP) so different to Pantone Solid (U)?

I've recently bought Pantone Uncoated Color Bridge fan guide (I've owned Formula Guide for some time now) — it's great. What surprises me though is the obvious color shift in Color Bridge (UP) colors. ...
0
votes
0answers
13 views

Is there a colorspace atlas available in stock somewhere? [duplicate]

There are lots of pictures of an RGB colorspace atlas designed by Tauba Auerbach: http://www.designboom.com/art/tauba-auerbach-rgb-colorspace-atlas/. I wonder if there are such things in stock ...
0
votes
0answers
56 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. ...
0
votes
0answers
78 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 ...