Questions tagged [color-conversion]

Questions about changing colors from one color space to another, most often to match the original color as closely as possible.

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2 answers
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In Illustrator, how to replicate exactly the displayed CMYK mode colors in RGB mode?

I have a two stop gradient in CMYK color mode (FOGRA). After converting the document to RGB mode (sRGB), there's a slight color shift between the two gradients. The RGB gradient is a bit redder/darker....
1 vote
1 answer
36 views

Can a bmp image be 16bit depth?

I'm trying to create a watchface for my wristband and the only form of image I'm supposed to play with is a bmp image, 16bit depth, 300 KB size or lower. It seems impossible to combine these 3, Please ...
0 votes
1 answer
129 views

How many colors in YCbCr JPEG under common conditions 3x8bits?

Aproximayly 1/3 volume of a cube is at this picture from wikipedia So does YCbCr JPEG have aproximayly 2^(3*8)/3 = 5 592 405 colors? Also coefficients KR+KG+KB=1 are used for converting YCbCr to RGB. ...
1 vote
2 answers
73 views

Color Difference functions are not good. What am I missing?

In the last few days, I tried out three renowned color difference functions. My expectations were very high as it was a function that reflected human perception. CIE2000 ITP (also called ICtCp or BT....
8 votes
2 answers
2k views

Why is CMYK needed when printing when RGB+color profile can provide the same?

I see some professional printers asking for documents using CMYK instead of RGB. But I don't understand how it is better than RGB with an appropriate ICC color profile. Indeed, if my understanding is ...
3 votes
2 answers
200 views

Is there any list of which PMS spot colors are reproducible in CMYK?

Is there any list of which PMS spot colors are reproducible in CMYK? And a list of which Pantone colors are out of gamut for CMYK?
1 vote
2 answers
337 views

Best CMYK export option

I am a children's book designer writer. I am trying to format my first picture book for printing. I have worked the images in RGB, but thought I should convert in Affinity before sending to printing....
0 votes
0 answers
21 views

Use new ase file to change multiple files created with old ase file and global colors

I have 30 files all colored using the same global color swatch palette generated by the same .ase color swatch library. Is there a way to use a new .ase file to globally change those colors? I know ...
0 votes
3 answers
4k views

How to remove color areas from an image?

How I can remove all color areas from an image? I don't mean desaturate. Desaturate turns color into gray. I want to turn any color into white, and preserve any existing grays and blacks. For ...
0 votes
0 answers
60 views

How can I procedurally modify the hair portion of this texture to better match the intended color?

I have this texture for the head and hair of a humanoid 3D model: That is the version of the texture re-saved as a .JPG. For reference's sake, here is the original in .PNG format: This character ...
1 vote
1 answer
502 views

Color management for printing on foil packaging

I recently worked on a foil packaging design project on Illustrator, but the colors on the end product are very off. Everything seems way off and a lot less sharp, what are some tips and pointers for ...
2 votes
2 answers
6k views

Replace color for all layers

I have a file with about 500 layers, and I need to replace a color in all of them. I looked through different solutions here and elsewhere, and they all suggested using an adjustment layer or ...
0 votes
2 answers
1k views

InDesign: Convert RGB to CMYK for clean gray colors

When I convert gray color swatch from RGB to CMYK InDesign transmit that as a mix of C, M, Y, K. How can I convert that values to K only? The goal is to get clean gray colors on print output. ...
2 votes
3 answers
2k views

Calculate blend mode colors

In my case, I have a background color #333 and a "+" layer with blend mode difference. The blend mode is evidently so that the "+" is always nicely visible for any background color ...
0 votes
2 answers
19k views

Pantone TCX to Coated conversion

I need to convert some fabric colors to ink colors for screen printing. In the past I would use Pantone's X-Ref web utility but they've discontinued it. The only option appears to be paid a premium ...
1 vote
0 answers
106 views

How to use color settings together in Photoshop, InDesign, PDF export for print?

There are color settings in Photoshop, InDesign, and in PDF export within InDesign. How do they work together? I know color is complicated so I tried to keep questions below focused. I get lost in the ...
0 votes
2 answers
840 views

GIMP; Transfer source tonal/color profile to a second image

In GIMP, is there a programmatic/algorithmic way to transfer the color/tonal profile of one image to another when they have similar subjects? I have this image: And then this image: Similar ...
1 vote
0 answers
85 views

X-Rite Color Picker software alternative?

We have a very old Mac running X-Rite color picker. This software is awesome because it converts spot colors to CMYK based on our proprietary icc profile with the ability to limit the conversion to a ...
8 votes
7 answers
5k views

Why is 50% black/white is 128, and not 127?

In the RGB color model, color values are represented in the 0-255 range. 0 is not a dummy value, so in the 0-255 range, there are 256 colors. When using HSL (or something similar), I'd expect 50% to ...
2 votes
2 answers
19k 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 ...
4 votes
4 answers
561 views

How to accurately isolate the hue of an image?

This began as a simple question but got confusing the more I thought about it. I hope somebody here can help me get it sorted. I was preparing an image texture that was to serve a purpose similar to ...
1 vote
2 answers
18k views

How to convert photo into pantone for spot printing?

I need your help please of How to convert an RGB/CMYK photo into spot color pantone in channels? And if there are different methods, I would really appreciate providing them.
3 votes
2 answers
5k views

Inkscape in terminal: convert to greyscale

What is the command for inkscape (called from the terminal) to convert graphics to greyscale? I was not able to find in in the manual. I use the following command: inkscape -f drawing1.pdf -A ...
3 votes
2 answers
1k views

How can one transform a neutral lookup table texture for color blindness?

I want to add color blindness support on my Unity game, for this, the Color Grading effect appears to be the way to go. This is the neutral lookup table, i.e. when applied, nothing changes, it's ...
0 votes
1 answer
298 views

I'm trying to replace/change colors in an image

I have this logo that came along with a theme: On a website, a new branding occurred, and now we have a limited range of colors: --color-primary-blue: rgb (44, 45, 101); --color-primary-...
3 votes
3 answers
471 views

How do grayscale values work in an RGB document?

I am trying to understand how channels work. I created a blank 8bit RGB document in Photoshop and filled the background layer with 50% gray. But however, when I navigate to channels and click on R, G ...
3 votes
1 answer
315 views

InDesign: Exporting CMYK doc as RGB

If I want to export a CMYK document as RGB, is it best to go into every swatch, and every placed link, and make sure all the colours are set to RGB before exporting? Or can I just set it to sRGB under ...
1 vote
0 answers
100 views

Colour conversion discrepancies between — and within — Adobe apps

I work a lot with brand colours specified as Pantones, but often printed as CMYK. Naturally, I want those conversions to be as accurate and as consistent as possible, and I keep my Adobe applications’ ...
6 votes
6 answers
15k views

Color mixer that can mix 3 or more colors?

I'm looking for some sort of service, tool or application – even manual techniques – where you can digitally mix/blend 3 or more colors (i.e. not 2 as in most applications out there) and get the ...
5 votes
1 answer
187 views

What process has been used to derive these "tints"?

I have some brand guidelines. One of the main colours is #004F6B. The guidance advises the use of "10% tints" to expand the palette. The suggested tints for this colour are: 100% #004F6B 90%...
3 votes
2 answers
7k views

Gimp: Change a signature color from black to blue, preserving the tones

I have a scanned signature written in black pen. I have removed the white paper parts of the image using alpha transparency. After using it several times, it seems that it would look better if the ...
1 vote
2 answers
189 views

Best 4-color palette for dithering arbitrary images on screen

Duplicate of this question since society of retro-computing closed it and recommended it to be moved here. In the good ol'days many computers limit their palettes to 4 to 6 colors instead of 8/16/256/...
18 votes
9 answers
62k views

How to convert RGB colors into CMYK (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 ...
5 votes
1 answer
2k views

How to change color of this icon?

I've read several tutorials and watched quite a few videos but none of them are working. I am using GIMP and wanting to change color of this icon to the following hex color. Hex color - #006b5f The ...
1 vote
2 answers
70 views

Derive a color from another one and a “ratio”?

(Disclaimer: I don't understand well color models.) For a document, to be typeset thanks to LaTeX, I have: a “dark” color (DC for short): CMYK(1,.60,.10,0), a “light” color (LC for short): CMYK(1,.35,...
1 vote
1 answer
372 views

Changing Color palette and pixelating

I have a photo of my dog and I thought it would be fun for my kids to reproduce it in chalk on our drive way in large scale, then look at it from our up stairs window (and hopefully learn about colors ...
1 vote
1 answer
235 views

How can I change CMYK and Registration colors to RGB in Scribus?

I need to convert all of my file's colors to RGB. Most of them are already RGB. There are 2 CMYK and 1 Registration. I can edit the RGB colors into CMYK with the Edit button, but not the other way ...
9 votes
4 answers
5k views

When is it really worth it to convert RGB to CMYK (If printers do it anyway!)

Since it is very overwhelming and doubtfully necessary, is it a good idea to depend on printers (RGB to CMYK) auto-conversions to produce usual printing needs? (When Spot Coloring isn't an option for ...
3 votes
2 answers
409 views

Question about what colours fall into the pointers gamut

Absolutely no idea if this is the best place to ask, if not, please point me in a better direction. Basically, I have been using this software to determine if the pixel colours of an image (the pixel ...
1 vote
2 answers
40 views

Inverting photo using pre-defined material colors

I like to use black-backgrounded slides for my conference presentations. However, as research papers use white-backgrounded figures, they should be converted. A good option is inverting the colours. ...
2 votes
3 answers
336 views

Theoretical best colors for dithering

It would seem that I'm very bad at explaining myself. This is not unusual, thus this clarification. Imagine a flip dot display. 2 colors, one or the other, per flip dot or pixel, no substrate, no ...
1 vote
1 answer
298 views

Trouble converting from sRGB to CIE 1931 XYZ

No idea if this is the right place to ask this, if not, please point me in a better direction. I am trying to convert sRGB values R:100 G:78 B:94 to XYZ using this site: https://www.nixsensor.com/free-...
5 votes
5 answers
35k views

Why are my converted CMYK blacks coming out grey?

I'm having a rather annoying problem! I have RGB images made in Photoshop that I need to convert to CMYK. When I save the file my black background is converted to a light grey! I tried deleting my ...
1 vote
3 answers
1k views

Colour management for logo design in Inkscape/Scribus

I’m new to graphic design and am unsure of how to manage colours in a logo I’ve just created. It’s black text (converted to paths) with one small graphical element (a leaf). I created it in Inkscape ...
0 votes
0 answers
59 views

avoiding 'dot gain' : preparing inner sleeve design in illustrator for printing on uncoated stock

I'm preparing album cover artwork -- I'm going to print some vinyl. The mfr recommends a disco jacket as the inner sleeve for 180g vinyl because it resists the vinyl tearing a hole over time. Their ...
1 vote
1 answer
901 views

Blur effect becomes grey-ish and colours flat when transformed into CMYK

I need your help. I am trying to convert my RGB poster into a printable CMYK poster. But when I change the "neon like" headline to CMYK colours and the document color mode in illustrator the ...
1 vote
0 answers
110 views

Reproducing industrial system colors (RAL, NCS, Pantone)

Assuming I have access to equipment that gives me ability to measure precise amounts of fluids - is it possible to reproduce colours of any well-known system (like RAL, NCS...) using avialable ...
2 votes
1 answer
86 views

Why are even displays with high or complete specific color space coverage not correctly calibrated?

Despite many people asking about calibration, I couldn't find an answer to the following (imo important) question: . Why are so many displays incorrectly or un-calibrated, in other words inaccurate, ...
1 vote
1 answer
2k views

Exporting InDesign PDF with RGB converted to CMYK, colours look dark and muted?

I am working on a publication in InDesign, working on a 2019 Macbook Pro display, in which there are around 300 links to images. Some images are in RGB, and some in CMYK. Here is an example of an ...
0 votes
1 answer
1k views

Why is my EXR showing up lighter than expected in Photoshop?

I have a 32-bit EXR image that's supposed to show the following color: r: 0.5 g: 0.5 b: 1.0 each color channel is in the [0, 1] range. When I open the EXR file in Photoshop, this is what I see: You'...

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