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post #6211 of 6223 Old 06-30-2015, 12:08 PM
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Quote:
Originally Posted by zoyd View Post
No need to send me any data, I did swap dC and dH in the calculation - thanks for the catch!
You are more than welcome, I'm glad I was able to help and thanks for the updates.

I think something went wrong with the RGB levels to HSV levels transformation. I calibrated an older Epson projector to 75% saturation. The 100% primaries and secondaries are all oversaturated and have lower than reference luminance. R and C have near-perfect hue. See the attached file. All this is in line qualitatively with the RGB levels for each of the six colours. However, switching to HSV levels gives an S value smaller than 100% for both R and M. So in HSV values they appear undersaturated!

In other files B or G appear oversaturated in RGB, but incorrectly undersaturated in HSV.
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post #6212 of 6223 Old 06-30-2015, 02:38 PM - Thread Starter
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Quote:
Originally Posted by Slower View Post

In other files B or G appear oversaturated in RGB, but incorrectly undersaturated in HSV.
This is because the saturation error is calculated as the distance to the white point in 3 dimensions and not the distance of the projection onto the xy plane. So when you are under-luminance you will pull the saturation number down with it and why you can sometimes trade luminance for saturation (or vice-versa) in minimizing dE. If you take the example you uploaded and set the red Y such that the luminance error is close to zero the saturation bar will go positive.
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post #6213 of 6223 Old 06-30-2015, 09:54 PM
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Well, it turns out I just had my brightness set to high. This made 16 appear as a dark grey instead of black or video black. I'm still watching TV on this Toshiba 46sv709u. Experienced the artifacts that appear after adjusting color brightness, now I've solved that by increasing color while monitoring the CIE chart, thanks for the help Zoyd and the rest of you guys, now to start from scratch.
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post #6214 of 6223 Unread 07-03-2015, 05:22 AM
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Quote:
Originally Posted by zoyd View Post
The way it's supposed to work and let me know if it doesn't is that when you enter a black Y value via the preferences page (not directly in the grid), the 0% pattern should be skipped in both manual and automatic mode when measuring grayscale, near-black, and contrast.
zoyd,

I seem to have come across an issue with the "Override black" feature. If I turn it on and do a "Near black gray scale" run, all the points will show the manual value, i.e. I will get a flat line.

Also, it would be useful to display the Target Y in the gray scale grid, especially in situations like this when it's no longer 0. Or highlight the column to indicate it's been overridden.

Thanks.
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post #6215 of 6223 Unread Yesterday, 01:54 PM - Thread Starter
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3.3.4 has been uploaded to sourceforge.
  • Update Chromecast code for ANSI contrast sequence.
  • Increased ANSI blocks to 5x5 with centered black/white.
  • Update Chromecast code for special patterns.
  • Fix nearblack sequence bug when using black override.
  • Store/recall black measurement when using black override.
  • Added highlight for black override [column background shaded for 0% stimulus]
  • Added Y Target and dE/Ref for nearblack/white grid display.
  • Static pattern detection avoidance.
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Last edited by zoyd; Yesterday at 03:02 PM.
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post #6216 of 6223 Unread Yesterday, 02:27 PM
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Please help, I did some searching but was unable to find answers for 2 questions:
1. Is there a step-by-step tutorial on how to get HCFR to recognize my ColorMunki Photo as a sensor?
2. Is there a guide on how to use Chromecast as the pattern generator?
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post #6217 of 6223 Unread Yesterday, 03:14 PM - Thread Starter
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Quote:
Originally Posted by jkcheng122 View Post
Please help, I did some searching but was unable to find answers for 2 questions:
1. Is there a step-by-step tutorial on how to get HCFR to recognize my ColorMunki Photo as a sensor?
Update the driver through control panel with the one located in the program folder\drivers directory.

From the argyllcms installation notes for Win7 [edited path for HCFR]:
To install the Argyll Driver:
(Plug in instrument)
Start -> Control Panel -> Hardware and Sound -> Device Manager
(Locate the instrument in the device list. It may be underneath one of the top level items.)
Right click on instrument -> Update Driver Software... -> let me pick from a list of device drivers on my computer -> Have disk... -> Browse...
-> HCFR\drivers -> select ArgyllCMS.inf -> Open -> OK -> Install this driver software anyway -> Close


Quote:
2. Is there a guide on how to use Chromecast as the pattern generator?
Your PC needs to be on the same network as the chromecast and then you just select it from the view images setup page. All patterns will then be sent to the Chromecast device.

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post #6218 of 6223 Unread Yesterday, 06:05 PM
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Quote:
Originally Posted by zoyd View Post
3.3.4 has been uploaded to sourceforge.
  • Fix nearblack sequence bug when using black override.
  • Store/recall black measurement when using black override.
  • Added highlight for black override [column background shaded for 0% stimulus]
  • Added Y Target and dE/Ref for nearblack/white grid display.
Thanks zoyd, for the update.

I have some further questions and comments on the nearblack measurements:
- on the graph, why is the displayed Y always normalized to the Target-Y at the highest point being measured? The grid does not do that.
- at 0%, the "measured" Y value is displayed to be the same as the Target-Y in the grid view, but not on the chart.
- why is the number of measurement always greater than the specified number by 1?
- Auto-scale for the nearblack graph does not seem to work sometimes. I haven't quite figured out the pattern.

Thanks again.
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post #6219 of 6223 Unread Yesterday, 06:30 PM
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Quote:
Originally Posted by zoyd View Post
Update the driver through control panel with the one located in the program folder\drivers directory.

From the argyllcms installation notes for Win7 [edited path for HCFR]:
To install the Argyll Driver:
(Plug in instrument)
Start -> Control Panel -> Hardware and Sound -> Device Manager
(Locate the instrument in the device list. It may be underneath one of the top level items.)
Right click on instrument -> Update Driver Software... -> let me pick from a list of device drivers on my computer -> Have disk... -> Browse...
-> HCFR\drivers -> select ArgyllCMS.inf -> Open -> OK -> Install this driver software anyway -> Close
I am getting this error when trying to load the ArgyllCMS.info file.
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post #6220 of 6223 Unread Yesterday, 06:53 PM
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Quote:
Originally Posted by zoyd View Post
s on my computer -> Have disk... -> Browse...
-> HCFR\drivers -> select ArgyllCMS.inf -> Open -> OK -> Install this driver software anyway -> Close
zoyd,

is there any reason why DTP94 is not supported by HCFR? the Arguyll driver includes it.

Thanks.
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post #6221 of 6223 Unread Today, 04:30 AM - Thread Starter
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Quote:
Originally Posted by Dominic Chan View Post
Thanks zoyd, for the update.

I have some further questions and comments on the nearblack measurements:
- on the graph, why is the displayed Y always normalized to the Target-Y at the highest point being measured? The grid does not do that.
The graphs are normalized to peak white so that the R,G,B curves can be examined at the same time, this behavior is the same as the grayscale luminance chart.

Quote:
- at 0%, the "measured" Y value is displayed to be the same as the Target-Y in the grid view, but not on the chart.
The chart value is the calculated black using the EOTF rather than the measured black, I need to make those consistent.

Quote:
- why is the number of measurement always greater than the specified number by 1?
n levels + black

Quote:
- Auto-scale for the nearblack graph does not seem to work sometimes. I haven't quite figured out the pattern.
Known issue.

Quote:
Originally Posted by jkcheng122 View Post
I am getting this error when trying to load the ArgyllCMS.info file.
Your computer has to allow unsigned driver installation.

Quote:
Originally Posted by Dominic Chan View Post
zoyd,

is there any reason why DTP94 is not supported by HCFR? the Arguyll driver includes it.

Thanks.
Why do you say that, the DTP20, DTP92Q, and DTP94 are in the .inf file and should be recognized by HCFR, although I do not have one to test.
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post #6222 of 6223 Unread Today, 09:49 AM
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Quote:
Originally Posted by zoyd View Post
Your computer has to allow unsigned driver installation.
Thank you Zoyd, got it workking now. Wonder why M$ made it so much hassle to disable the driver signature requirement.

One other thing, I noticed every time I open HCFR (have done this lots of times trying to get driver to work), the window size reverts to original size even though Preferences->General->Save Sizes and Position is checked.
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post #6223 of 6223 Unread Today, 12:03 PM
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Quote:
Originally Posted by zoyd View Post
The graphs are normalized to peak white so that the R,G,B curves can be examined at the same time, this behavior is the same as the grayscale luminance chart.
Normalization makes sense for the grayscale luminance, as the 100% Y is taken to be the the 100% Target-Y. The same cannot be said for the nearback run which is just a "zoomed in" view of the grayscale low end. If I use 10 points for nearblack run, the grid may show that the luminance and R/G/B are "way off" at 10%, and yet the normalized graph shows everything is "right on".

Quote:
Why do you say that, the DTP20, DTP92Q, and DTP94 are in the .inf file and should be recognized by HCFR, although I do not have one to test.
When I connect a DTP20 (not 94), it's recognized in Windows Device Manager with the Argyll driver, but does not show up in HCFR sensor selection.

An unrelated issue: when using a power law gamma between 1.8 and 2.0, the gamma graph shows the average too low by 0.01 (e.g., 2.0 will show as 1.99). Outside the range it is OK.

Last edited by Dominic Chan; Today at 12:09 PM.
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