Where does DisplayCal store the profiles once they have been created on Windows?

[wrightpt]

This is great software.

I would like to create a few color profiles for my monitor and then try them out. However, I am not able to find out where DisplayCal stores them so I can go back to them?

With linux, it is easy. But if anyone has any input on Windows. It would be greatly appreciated.

Thank you,

Patrick

[Florian Höch]

See “User data and configuration file locations” in the documentation.

[wrightpt]

Thank you,

I am making display profiles to reduce eye strain and thus far it has helped a great deal. However, I  want to know how to make a profile continuously that is easier on my eyes. thus far it has been mostly a guessing game.

While the profiling is going on the box that changes color. I notice as the colors change on that, the eye strain happens. Its not like my eyes are tired but certain colors causes the muscles around behind my eye to struggle in some way and it causes me to loose focus. Usually it is with darker colors but I made an icc profile that had a gamma of 4.5, something higher than any option I found, then it seems to be the lighter colors, light bright pink for example.  so what ever that color box is doing if i can allow it to show a color in a way that does not cause I strain then I am in the clear.

The same strain happens when when using my monitor through out the day when switching between browser tabs, applications, or scrolling. But its a very repeatable process with calibration box and allows me to pinpoint it a lot easier.

A few question/comments. Any feedback from the folks on the forum would be appreciated.

is it true that making the profile slower and with more patches, creates a better profile?

I have noticed that while the calibration is going on the following message shows while on Windows, not so much on Linux(ubuntu) if i remember correctly:  “dispcal: inverting jacobian failed (3) – falling back”

I was wondering, on the custom tab after click on the Calibration button beside “Display & Instrument,” if I set gamma to 0.0, is that a bad idea?

I have the following monitor (LG IPS): LG 32MA68HY-P . I am currently calibrating my monitor and cannot bring up the DisplayCal Gui. I use the correction that states WLED and LG. I hope that is the correct correction.

I use an AMD card and I changed the color from 8 bit to 6 bit and this has helped quite a bit as well. Is there any way to let DisplayCal know this?

But when it comes to creating a custom tone curve, is there any  information that is just good to know  or can someone point me to a good place to get up to speed on how to do this? if I want to reduce the strain on the eye or eye muscles and am not concerned really about the best appearance.

Thank you so much

[wrightpt]

Hope I have not asked to much. I realize the software is third party. I have learned a great deal from the forum thus far.

[Florian Höch]

I am making display profiles to reduce eye strain and thus far it has helped a great deal. However, I want to know how to make a profile continuously that is easier on my eyes. thus far it has been mostly a guessing game.

Eye strain when working with a computer display usually happens for any number of reasons:

• Monitor too dark with regards to ambient light
• Monitor too bright with regards to ambient light
• Reflected light due to unsuitable monitor placement
• Posture when looking at the display
• Distance from the display
• Unsuitable ambient light
• Display flickering
• Monitor whitepoint too warm or too cold with respect to the ambient light

Adjusting calibration settings other than white level/whitepoint is not likely going to help with eye strain, and is the wrong approach. Review the points above.

While the profiling is going on the box that changes color. I notice as the colors change on that, the eye strain happens. Its not like my eyes are tired but certain colors causes the muscles around behind my eye to struggle in some way and it causes me to loose focus.

Focusing on the patches displayed during profiling is missing the point.

I made an icc profile that had a gamma of 4.5

That is not a very good idea – a too high gamma will make the instrument struggle to see any difference between very dark colors, unnecessarily prolonging the measurements (and a typical 8-bit display would not be able to resolve the levels near black anyway, leading to quantization). A reasonable gamma choice should be between 1.8 (bright environment) and 2.6 (dark environment / “bat cave”). Also note that the choice of calibration gamma does not affect color managed applications, as calibration is part of adjustment, which happens prior to profiling.

is it true that making the profile slower and with more patches, creates a better profile?

Increasing the number of profiling patches usually increases the accuracy.

I have noticed that while the calibration is going on the following message shows while on Windows, not so much on Linux(ubuntu) if i remember correctly: “dispcal: inverting jacobian failed (3) – falling back”

Probably related to the very high gamma choice and the instrument struggling.

I was wondering, on the custom tab after click on the Calibration button beside “Display & Instrument,” if I set gamma to 0.0, is that a bad idea?

You can’t, gamma always has to be > 0.

I use an AMD card and I changed the color from 8 bit to 6 bit and this has helped quite a bit as well. Is there any way to let DisplayCal know this?

The only thing that reducing the bit depth does is resolve color steps with less resolution (bigger steps), thus introducing banding.

[wrightpt]

Thank you for the thorough response.

I am re-calibrating with the gained knowledge. While it is calibrating, its like it takes over my current ICC profile. Or my screen becomes different from the Color Calibrator installed. As I play more with my monitor and DisplayCal, i find there are certain times when my screen is more pleasing than other times and would appreciate knowing what happens to screen settings once the calibrate button has been hit and it starts.

Also, as far as ambient light goes, I am getting more for sure. I tried constnat voltage LEDs (the strips bought from any retailer online basically that come in a ribbon and they seemed to conflict with my screen. As do led tubes, incandescent, and halogen.)

But the constant current leds work the best. I have found out these are what are in the back of my monitor. Suprise Surprise.

anyway, please let me know if you can, once it stars calibrating how it changed my current screen settings once it starts calibrating.

Many thanks,

Patrick

[Florian Höch]

I am re-calibrating with the gained knowledge. While it is calibrating, its like it takes over my current ICC profile.

During calibration, the graphics card videoLUTs are reset to linear.

would appreciate knowing what happens to screen settings once the calibrate button has been hit and it starts.

The software cannot alter screen settings.

[wrightpt]

Thank you,

What does it mean to set video look up table to linear? I am a linux user but think mac are much easier on my eyes than Ubuntu. But I honestly think its in the Look Up Table not the OS. I am always ready to be wrong

Thank you,

Patrick

[Florian Höch]

What does it mean to set video look up table to linear?

Input = output (1:1 relationship).

[wrightpt]

Thank you,

Is displayCal capable of calibrating the quantum dot monitors from Samsung? I am not calibrating this type currently but am considering it.

upon doing the “Report on uncalibrated display device” :

White level = 221.47 cd/m^2
08:56:17,111 Aprox. gamma = 2.31
08:56:17,112 Contrast ratio = 1190:1
08:56:17,113 White chromaticity coordinates 0.3096, 0.3248
08:56:17,113 White Correlated Color Temperature = 6713K, DE 2K to locus = 3.8
08:56:17,115 White Correlated Daylight Temperature = 6716K, DE 2K to locus = 1.0
08:56:17,115 White Visual Color Temperature = 6564K, DE 2K to locus = 3.7
08:56:17,115 White Visual Daylight Temperature = 6753K, DE 2K to locus = 0.9

–For the White level settings , is it best to set “as measured” or would it be better to put the value shown above for the white level which in this case is: 221.47 cd/m^2?

Same for gamma as well?

and for White chromaticity cordinates as well?

and for all of the gamma setting. i am greatful for them. is there a standard place to get the gist of all of thse? if they are covered in the instructions, dont worry i will find them. Thank you.

Patrick

[Florian Höch]

Is displayCal capable of calibrating the quantum dot monitors from Samsung?

Yes, although in case you’re using a colorimeter there are no vendor provided generic corrections for quantum dot.

For the White level settings , is it best to set “as measured”

You should adjust the white level to be appropriate for the ambient light level. This can be done without setting a target. Just display a fullscreen white and adjust the backlight until it is neither too dim nor too bright.

Same for gamma as well?

Gamma 2.2 is the recommended default.

and for White chromaticity cordinates as well?

There is little point to setting the whitepoint target to the current whitepoint, the result will be identical to “As measured”.

for all of the gamma setting. i am greatful for them. is there a standard place to get the gist of all of thse?

See the documentation.

[wrightpt]

I have an LG IPS 32MA68HY-P. I am not using a color correction. should i be?

I saw a correction option for LG Samsung IPS. I left it as auto and it showed none.

[Florian Höch]

I have an LG IPS 32MA68HY-P. I am not using a color correction. should i be?

That monitor probably has a white LED backlight.

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