Color-calibrate a Dell U2413 wide-gamut monitor under Linux

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If I get a Dell U2413 wide-gamut monitor to use with Fedora for photography, will I be able to use it properly? I've got a ColorHug, and I see that there's a U2410 ccmx profile; will that get me in a reasonable enough ballpark? Or should I just go with the standard-gamut U2412M (for half the price)?

I'd prefer the wider-gamut color in the ideal world, of course, but I'd prefer perfectly-working 8-bit sRGB to miscalibrated wide-gamut.

(PS: Linux only; no dual-boot.)

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I shouldn't be answering really, since my only experience with Colorimeters was an old Spyder2 and the results were so utterly horrible I decided to not follow this "religion" anymore. I'm happy with the factory colors my display gives me. ;)

In theory, it should work.

As for using it in Linux someone wrote a blog article about the process here: http://macprofilingandcalibration.blogspot.com/2013/06/display-calibration-and-profiling-in.html

As for wide-gamut there's an interview here where it is mentioned: https://banu.com/blog/41/interview-of-colorhug-maker-richard-hughes/

But in practice, who can say really? You have no real control over what kind of result you're going to get and whether you'll be happy with it. There's only one way to find out...

Maybe you should take this question to the colorhug users list, you could have more luck finding someone with that or similar gamut monitors there https://groups.google.com/forum/#!forum/colorhug-users

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How to simply adjust monitor color temperture in X

Okay, so, the answer is that the redshift program, pointed out by Stéphane Gimenez in a comment above, can do this pretty simply. It's meant to do a clever adjust-white-point-over-the-day thing, but it can also be made to do one-time adjustments with the -o flag.

The desired color temperature in Kelvin must be given twice because of the time-based features, which is a bit weird but unimportant. And the other stuff is just there to suppress unhelpful-in-this-case informational messages — it's not important.

 redshift -o -l 0:0 -m randr -t 6000:6000

It's also important to note that the code assumes that neutral is 6500. (And experimentally, -t 6500:6500 appears to me to be identical to using -x to remove the effects completely.) On my system, where I think the native whitepoint is 9300K or so, I'm not sure what the actual numbers end up meaning, but the effect of choosing something lower than 6500 is certainly exactly what I want.

I was curious, so I looked at the code. Redshift is doing something a bit more complicated than running xgamma — it has a whole color-ramp table, with data sourced from http://www.vendian.org/mncharity/dir3/blackbody/. I'd look into it even further, but I think the next step is going for full-on proper color calibration.

How to generate CMYK images via the command line under Linux

Save a python script like this:

#!/usr/bin/python
from PIL import Image, ImageFont, ImageDraw
import sys

im = Image.new('CMYK', (1000,1000), (0, 0, 0, 255))

f = ImageFont.load_default()
d = ImageDraw.Draw(im)
d.text((500, 500), sys.argv[1], font = f, fill = (0, 0, 0, 0))
del d

im.save(sys.argv[2])

Dependencies are python and the python imaging library. Then you can create your images with this command:

python cmyktext.py "Josh test" Jtest.pdf

Don't forget that cmyk is subtractive, so (0,0,0,0) is actually white. It is of course also possible to use any font you like, as documented here.

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Related Solutions

How to simply adjust monitor color temperture in X

How to generate CMYK images via the command line under Linux

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