- This topic has 6 replies, 2 voices, and was last updated 7 years, 1 month ago by
.
-
Posts
-
At the beginning, I want to thank you for that great piece of software (DispayCal).
I am here, because I need a small assistance from you forum members.
Recently, I had done calibration process of my 17” laptop screen, but I am not a happy with a results. In order to do that I had used preowned Monitor Calibrator – Spider 4 Elite, bought on eBay.
I didn’t see any difference in a white point, maybe slightly difference in a brightness from 118,25 cd/m2 to 121,48 cd/ m2, the gamma is 2.2. RGB values are basically the same.
After prosecuted colour profile test (XXL verification test chart(video)) I had received among others exceeded values for:
Measured vs. assumed target white point ΔE*00: 11.27 (recommended: <= 1)
Maximum ΔE*00: 6.86 (recommended: 3)
Tech details:
Screen configuration
General: 17,3” Full HD IPS Screen
Display screen type: Active Matrix TFT Colour LCD
Display Screen Technology: In-plane switching (IPS) Technology
Anti-glare matte screen
Conclusions
Laptop drivers doesn’t allow me to adjust initially my monitor RGB values. In addition I had observed that after RGB correction via WCS in Windows 10 drivers enforce previous RGB values, so it is impossible to adjust RGB values before exact colour calibration in DisplayCal.
List of files attached to this message:
· Room configuration with a light condition, and colour walls
· Screenshots from interactive display adjustment (before, after)
· XXL verification test chart(video)- html format
· Colour management WCS setup
· Computer config
· LOGS from colour calibration process
· Icc monitor profile
All of these attachments you can find on my dropbox at the following link:
https://www.dropbox.com/sh/z58na1unu8ia40h/AADp1iwljhki4NnSjY4_6xiaa?dl=0
Any help highly appreciated
Thank you for your time and consideration.
Cheers
Laptop drivers doesn’t allow me to adjust initially my monitor RGB values
You cannot adjust RGB via other software as this interferes with calibration. The display needs actual hardware controls (which Laptops usually lack), so you have to skip interactive adjustment of RGB. You can still set a different whitepoint target if desired, the calibration will take care of it.
You also should use the white LED measurement mode of your Spyder4 with the Laptop display (which according to [1] has a white LED backlight).
The report doesn’t look too bad (apart from the one outlier), only your native display white isn’t close to the daylight locus (which isn’t a problem per se).
[1] http://www.panelook.com/LP173WF4-SPF5_LG%20Display_17.3_LCM_overview_29880.html
Hello Florian,
At first, I want to thank you for your valuable response. Mostly I am working at night. Previous monitor calibration, I had done during the night. I have a primary light source from the top; this is a bulb 50W 6500k.
You cannot adjust RGB via other software as this interferes with calibration. The display needs actual hardware controls (which Laptops usually lack), so you have to skip interactive adjustment of RGB. You can still set a different white point target if desired; the calibration will take care of it.
I need at least two white points: 5500K for printing purposes and 6500K for photography, and graphics adjustment. Previously, during my first attempts I had calibrated monitors to this desired temperature specification, but after that my monitor became very yellowish, blueish, all depends what preset I had been used at that time.
The question then arises as is it better solution to invest a proper light source , I mean 5500K bulb in order to “make” your work environment more consistent for what I am doing so then the ambient light colour temperature will be closer to this ideal or just set up “fixed” values in a DisplayCal, and deal with a off white point on monitor ?
You also should use the white LED measurement mode of your Spyder4 with the Laptop display
Before Next Calibration I will set up white LED measurement mode. Shall I also tick “White level drift compensation” and “Black level drift compensation” options?
According to one of tutorials which I found on YouTube before I start to doing any measurement, should I first load correction instruction for my calibrator of choice, which I can see under Tools/ correction/ import colourimeter corrections from other display profiling software? In my case, it will be from Datacolor Spider 4.5. Is it good practice to do that? What this display profiling correction does exactly? I am curious of that.
As a rookie in this area. I have a few questions on which I am still looking for. I will appreciate answering on following questions:
What is the difference between these patch sequence options.:
Minimize display response delay
Maximize lightness difference
Maximize luma difference
Vary RGB difference
How they impact on final results?
What Advanced gamut mapping options does? I found over there, under source viewing conditions, an option called “Monitor in a darkened work environment” it will be ideal from case, but the question is in a case of working during a day shall I create another profile with a ticked option “Monitor in a bright work environment” or it does not matter?
Proper monitor calibration set up is crucial for me, because from proper monitor calibration, it also depends on a quality of softproofs, created for different paper stocks and printer inks.
Can I count on your help to recommend useful links, books about colour management system which will allow me to dig into this topic?
Thank you. in advance, and for your patience of course to read this wordy text.
Have a great Sunday.
The question then arises as is it better solution to invest a proper light source , I mean 5500K bulb in order to “make” your work environment more consistent for what I am doing
Definitely.
Shall I also tick “White level drift compensation”
Usually not needed for LED backlit LCD displays unless it’s an HDR or OLED display.
and “Black level drift compensation” options?
It’s generally not needed for colorimeters.
What is the difference between these patch sequence options.:
See the documentation.
What Advanced gamut mapping options does? I found over there, under source viewing conditions, an option called “Monitor in a darkened work environment” it will be ideal from case, but the question is in a case of working during a day shall I create another profile with a ticked option “Monitor in a bright work environment” or it does not matter?
These options are useful if you’re working with images that have (e.g.) been created for viewing in a dark environment, but your environment is brighter (or vice versa). The gamut mapping will adjust the image to keep the relative appearance the same. Usually you will not use these advanced options.
Can I count on your help to recommend useful links, books about colour management system which will allow me to dig into this topic?
“Real world color management” is still a good book, even though the software versions it covers are a bit dated.
Have a great Sunday.
Thanks, likewise 🙂
Hello Florian and other colour geeks,
First of all, I would like to apologise for my absence on this brilliant forums. I had been studying this astonishing book ( “Real world Color Management Second Edition”) recommended by Florian. It ‘s given me the overall concept of creating and modifying colour profiles. The most important statements from this book are:
- Colour correction is a very complex problem, mainly because, it is an’ individual impression’.
- Nothing is ideal – sometimes is better to create and use several profiles (all depends on what we are going to achieve).
- Editing and checking profile is more important than profile itself.
Now I am looking for another valuable resource, which helps me to ‘push’ my theoretical and practical knowledge even farther. If someone is able to help me in this manner, do not hesitate to share it with me.
Editing and checking profile is more important than profile itself.
This relates to print profiles, especially CMYK ones, as you can have different black generation. You wouldn’t typically want to edit display profiles. Checking is always good (verification).
Now I am looking for another valuable resource, which helps me to ‘push’ my theoretical and practical knowledge even farther
Do you have a specific subject in mind? I.e. colorimetry, human vision…?
