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

2
votes
3answers
56 views

Why is azure used instead of teal as cyan in color mixing?

Why does azure make a better cyan than teal for color mixing? On the HSV spectrum, cyan sits at 180 degrees, which is bright teal, whereas most printer inks and best primary blues for painting and ...
1
vote
1answer
35 views

Interior of Johannes Itten's color sphere?

Johannes Itten's color sphere is described here. The description includes an English translation. Here is one of his drawings: For reference, here is a vertical cross section of Albert H. Munsell's ...
2
votes
2answers
127 views

Interior of Munsell's sphere?

The Munsell color sphere is described on Wikpedia. But what does the inside of the sphere look like? There is some conjecture on Wikipedia (most of which is original research), and I can only find ...
0
votes
1answer
57 views

Accurate RGB to CMYK conversion [duplicate]

I am trying to print out a simple picture (below) that is composed of sections of the following RGB colors: 255,0,0 255,0,255 0,255,0 0,255,255 0,0,0 I am using this image for color sensing (...
0
votes
3answers
87 views

RGB to CMYK conversion problem

There is a situation where I have to transfer colors in Hex Format (from an app) to Adobe Illustrator. But I need to extract the exact CMYK value (that was assigned in the previous app). Long story ...
0
votes
1answer
39 views

Why does Photoshop CS6 open new documents in grayscale mode?

When I open a new document in Photoshop CS6, it opens in grayscale mode. How can I change this?
0
votes
1answer
46 views

RGB color Setting in Illustrator

I am working on Color Settings: Working Space: Adobe RGB (1998) CMYK: U.S. Web Coated (SWOP) v2 When I Export the artwork to JPEG, it gives me the different Color output. Then I have to Assign Profile ...
4
votes
1answer
431 views

I select a color in Photoshop and it's painting another one

I select a color in Photoshop and it's painting another one. I've checked RGB color mode and everything, but it seems to continue to change the selected color. How can I fix it?
0
votes
3answers
64 views

Should a Hex value match its RGB value in a Brand Guideline document?

Our organisation is using a brand guidelines document (produced externally) where the hex values and the RGB values of corresponding colors do not match. Both RGB values and hex values use the same ...
1
vote
7answers
261 views

Why aren't there printers that use red-green-blue ink cartridges?

Why aren't there printers red-green-blue ink cartridges? I would like some well-documented articles on this because I haven't found anything comprehensive. The best I've found are this and this on ...
1
vote
1answer
45 views

Is there a way to get correct color mixing without posterization, working with 8 bits only? Or something better than Linear RGB color space mixing?

I'm in search of a practical and orthogonal solution that preferably: Affect any blending mode. Can produce the most correct possible additive mixing. Produce the less posterization possible on ...
1
vote
2answers
85 views

Can monitors show colors outside of RGB space?

Modern monitors use RGB to reproduce colors. The [RGB colorspace, however, is not the full range of colors, and only occupies a triangle in the "full" chromaticity diagram][1]. What colors are ...
4
votes
3answers
181 views

InDesign color accuracy for calibrated PDF and JPEG exports [closed]

This is an age old question that litters the internet. I've been working in design for coming on two decades, so am fairly up to speed with color profiling for devices, images and proofing. I've sent ...
1
vote
0answers
36 views

Illustrator CC changing color of half my file on PDF export [closed]

Using Illustrator CC, we save all our CMYK illustration files in PDF format. I just encountered a file where the copied half of the file (the design just copied over to the second half of the paper) ...
2
votes
5answers
159 views

Separating two very close colors in GIMP (2.9)

I'm working on restoring an old drawing that wasn't stored properly. The paper (might be parchment) has yellowed, and the lines have faded. This results in the lines (the good part) being almost the ...
3
votes
1answer
45 views

Do Adobe RGB and sRGB assume 2 degree observer?

I know that Adobe RGB and sRGB assume D65 illumination, but do they assume a 2 degree or 10 degree standard observer?
1
vote
1answer
81 views

Creating logo files for printing and web

My client has asked for their logo files, (the source file is vector AI created with Illustrator). He wants a file for the web/printing letterhead (online and paper invoices) and a vector file for the ...
0
votes
1answer
216 views

Computing the range of CIE L*a*b*

I am currently using C# to compute the range of various color spaces. One such, CIE Lab*, is giving me a headache. To compute the range, I enumerate each possible RGB color, convert it, and store ...
3
votes
1answer
281 views

Lab Color Space in photoshop

If Lab Color space covers colors that are not supported by monitors how come photoshop are showing Lab color space in their colorpalette? What is the purpose of it? If I give Lab values as L-(85), a-(...
0
votes
1answer
440 views

Check colourspace in InDesign

So I've seen this answer on here: Indesign RGB color space But I'm wondering how do I tell what colourspace is currently applied to a document? I think the one I'm currently working in is set to CMYK,...
1
vote
1answer
613 views

How does one create a color wheel in Illustrator

How does one go about creating a VHS color picker shown below? I know it has to be a gradient around a circle, but then toward the center it gets lighter. The center is white. P.S. I have looked at ...
0
votes
1answer
261 views

Why does the color of my image change when it's reviewed on a mobile device?

I exported my vector CMYK file from Illustrator as an RGB image. On my customer's mobile, the colors change and he can not review the work to approve it. What can I do to display the correct colors?
0
votes
0answers
64 views

sRGB+RGB Illustrator file still exports PNG in wrong RGB colors?

I have a logo in Illustrator sent to me by someone overseas. Exporting it from my PC results in a darker, more subdued logo. But when I copy and paste the logo into a new Illustrator CC Web document ...
0
votes
0answers
25 views

WCAG contrast ratio formula & How they translated into wide gamut?

Why the highest contrast ratio in WCAG is 21:1, not 256:1? Can anyone explain the concept of the formula to me, in laymen's terms? Does the current guidelines change as we step into the world of wide ...
0
votes
0answers
60 views

Monitor RGB saturation

I use a monitor that supports the Adobe RGB color space. When I edit images in this color space and then select the Monitor RGB color correction setting then the colors look more muted. Then if I ...
0
votes
1answer
123 views

EPS file distorts on export in Indesign

I am an Indesign relative beginner (especially related to complex color correction). I've imported an EPS logo file into the document (it's currently layered over a photo) and in preview mode, it ...
3
votes
2answers
511 views

Why colors change when I export from Illustrator to Photoshop?

I am working on a Illustrator file that I need to export to Photoshop to edit. When I'm exporting it changes the color of my black and it becomes quite dull. The same thing happens when I export it ...
9
votes
4answers
365 views

Why should I calibrate my screen?

As both a web and print designer, I have never seen the need to calibrate my displays. Especially for web design, I wonder why I should spend several hundred euros to calibrate when I can instead test ...
0
votes
2answers
91 views

Consistent Color Management Across Printers

How do you manage a specific color, to print consistently across different printers / ICC profiles? I have a long time client and their brand color is a specific shade of coral rgb(250, 128, 112). I ...
1
vote
2answers
570 views

RGB or CMYK for resume/portfolio

Is it best to use RGB color-space when you don't know if the end-user of the document is going to be printing the document on an inkjet or laser printer? For example, even though my home printer has 4 ...
3
votes
3answers
567 views

Overlap RGB values to produce a single color

I am new at graphic design (obviously) and I would like to create a logo with overlapping colors to produce a desired color. In this case I would like to overlap 3 distinct colors (with I assume ...
0
votes
0answers
45 views

Is the low statistical correlation between the HSV channels, conditional upon the color name, a well known property of the color space?

I have been investigating color as part of a academic project. One of the assumptions I make as part of a larger project, is the conditional independence of the 3 channels of HSV, given the color name ...
2
votes
1answer
228 views

How to create a customized color cycle picture?

It is part of a university project visualize displacement of speckles between to pictures. To do that I use the HSV color room, so the angle of displacement is respresented by hue and the displacement ...
3
votes
3answers
684 views

What happens when you print without converting to CMYK?

When exporting InDesign files as PDF, it is converted usually to the intended colour space. But, what happens when you don't do that for whatever reason and send the non-converted PDF to print? Since ...
0
votes
1answer
68 views

Why two identical images forces two different color shade?

So, i have two images CMYK/8 bit to one image I set color #00ade3 to a shape, I then do the same to the other image (also same shape, just bigger) and it forces my color to #04ace3 instead, no way to ...
1
vote
1answer
133 views

How to determine the difference of color vibrance of a pair of images?

I'm an engineer, so my terminology may be incorrect when posing this question. I have a pair of pictures below and the top one is clearly more "colorful", "vibrant" and "saturated". The bottom one ...
0
votes
2answers
1k views

Illustrator: which settings to design a logo for print [closed]

What settings should I use when creating a document for logo printing? Looking to achieve the best quality for my logo design.
6
votes
3answers
410 views

Interpreting a* and b* in L*a*b* color space

In L* a* b* color space, I know L* corresponds to "lightness" so that as L* increases I can say colors are lighter. Is there a similar term that corresponds to the color channels a* and b*? For ...
3
votes
1answer
264 views

How to Generate Swatch Library from Json file?

I'm looking for a way to generate a swatch library from a JSON file in Adobe Photoshop CS6. Unfortunately, I can't seem to find anything on the web about this, and I don't know how to write my own ...
1
vote
2answers
470 views

Is D50/2 or D50/10 more typically used in graphic arts?

I was given some LAB measurements of color samples. The LAB measurements came with a statement that the illuminant is D50, but no specification of what standard observer was assumed (it would be ...
3
votes
1answer
125 views

InDesign: TAC of sRGB photos exceeds ink limit - does this cause issues when encapsulated in a PDF-X/3 document for print?

I'm using InDesign and I am exporting a photo book for an online printing service (Blurb) in PDF/X-3 (I use unaltered an Export profile that they provided). In the Output tab of the Export Adobe PDF ...
0
votes
1answer
165 views

File created in Photoshop looks different in Illustrator

I need to design a letterhead and I have this watercolour effect which I created in Photoshop (RGB file). I want to take this to Illustrator and work with this as part of my design for the letterhead. ...
1
vote
3answers
444 views

Besides pantone colors, is there any refrence database for equally distributed fashion colors?

I'm trying to divide color space into 150-200 colors. I'm looking for Hex code/ RGB values and corresponding color name that is simple, well known & understandable by normal people. Is there any ...
0
votes
1answer
160 views

Are XYZ tristimulus values and x y chromaticity coordinates unitless?

For the CIE1931 XYZ tristimulus values and x y chromaticity coordinates, I think these are unitless quantities. I have checked different plots of these quantities and haven't seen their units labeled, ...
0
votes
0answers
69 views

Does “XYZ tristimulus values” always refer to CIE1931?

I have a question about color space terminology. When referring to "XYZ tristimulus values" and "xy chromaticity coordinates", does this always refer to the CIE 1931 XYZ color space, and never to ...
1
vote
2answers
6k views

How to prepare RGB image for silk-screen printing

I have an image in RGB which I would like to silk-screen on a t-shirt. I want to prepare the file so that the result is as close as possible to the original image. I could simply convert the image ...
3
votes
2answers
370 views

Designing CMYK artwork on sRGB monitor

Since my monitor is limited to sRGB, is CMYK color space fully visible within sRGB, or Adobe RGB color spaces, or not? Conversely does CMYK have a converted NTSC color gamut % like sRGB or Adobe RGB?
4
votes
1answer
506 views

Making free Munsell color chip sheet

Munsell color reference chips are really useful for painters but awfully expensive. It should be easy to create a sheet that can reliably be printed on most printers though, shouldn't it? I.e a PDF ...
6
votes
1answer
841 views

Dominant color vs primary color vs prominent color of an image?

What is the difference between the primary color of an image, dominant color of an image, and the most prominent color in an image? Is the primary color and the most prominent color (most frequent ...
0
votes
1answer
290 views

Converting a logo to monotone in GIMP [duplicate]

I usually convert my logos to a particular colour (not just greyscale) in photoshop by using the following process: Convert to Greyscale/Choose Duotone/Select colour and click okay. I need to do the ...