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GCD - Gamut Calibration Disk - Page 5

Poll Results: What format would you prefer for the HTPC?

 
  • 33% (19)
    .mp4
  • 66% (38)
    .mkv
  • 0% (0)
    others (please detail in thread)
57 Total Votes  
post #121 of 631
I think a simpler menu would be better, the menu switching is fast enough that it's not painful anymore.

Top menu

-10% Windows
-25% APL
-Color Checker

10% Windows menu
-Saturation Sweeps
-Luminance Sweeps
-Primaries/Secondaries

Same for APL

Backround is nice, maybe add a picture like this to the top menu.

post #122 of 631
Beautiful
And pattern fields!
post #123 of 631
Thread Starter 
I think I agree regarding the menu structure. I Will Update.
I have now finished creating the test patterns and is in the middle of encoding them so a release around the weekend seams likely.

would there be any need of fields? and when would you actually use fields to calibrate with? Front Projectors?




Quote:
Originally Posted by zoyd View Post

I think a simpler menu would be better, the menu switching is fast enough that it's not painful anymore.

Top menu

-10% Windows
-25% APL
-Color Checker

10% Windows menu
-Saturation Sweeps
-Luminance Sweeps
-Primaries/Secondaries

Same for APL

Backround is nice, maybe add a picture like this to the top menu.

post #124 of 631
Yes! For Front Projectors.
My LED Samsung UE55B7000 bad calibrate windows
good calibrate APL and fields (saturation because they are not in APL in AVCHD).

Best regards,Andrei.
post #125 of 631
Need pattern 80% saturation - best calibration- 50% volume of a cube - minimum mistake!
post #126 of 631
Quote:
Originally Posted by anta1974 View Post

Need pattern 80% saturation - best calibration- 50% volume of a cube - minimum mistake!

75% isn't good enough for you?
post #127 of 631
80% mathematically exact - cubic root of 0.5 - 0.7937 - 79.37% pattern about 80%!
post #128 of 631
Quote:
Originally Posted by anta1974 View Post

80% mathematically exact - cubic root of 0.5 - 0.7937 - 79.37% pattern about 80%!

Given all the other uncertainties in the calibration process, 75% is fine.
post #129 of 631
Now understood, thanx!
post #130 of 631
as you read about gamma:
http://www.brucelindbloom.com/index....dCalcHelp.html

If you go to the trouble of mathematically finding the "best" gamma, you will find that its value depends on your definition of "best."

If best means minimizing the largest error, then the best gamma is 2.1723.
If best means minimizing the RMS (root mean square) error, then the best gamma is 2.3243.
post #131 of 631
That example answers the question "What value for gamma gives a companding function that most closely represents the CIE L* function (i.e. a uniform perceptual scale)?"

Unfortunately, this definition is not used as a reference in video production.
post #132 of 631
I understand
post #133 of 631
Thread Starter 
Please see first post for link to latest version b4.3.1

this release include 1% APL patterns, and a contrast pattern

Next release should include the color test pattern and grey scale patterns

any comments please let me know
also do you have any additional you wish including let me know.
post #134 of 631
Why 1% APL patterns?
Where 25% APL?
post #135 of 631
Thread Starter 
1% window size on 25% apl background, I was under the impression that was what was required
post #136 of 631
Thank you!
post #137 of 631
Where 10% Windows with 25% APL?
I find only 1% Windows with 25% APL.

Why use 10% patterns not recommended THX for plasma?
post #138 of 631
10% size windows inside of 25% background do not have constant APL

For gamma=2.2, 120 cd/m^2 white
10% windows: APL(10%)=4.8 cd/m^2, APL(100%)=9.9 cd/m^2
1% windows: APL(10%)=4.4 cd/m^2, APL(100%)=4.8 cd/m^2



@visca

I used the disk this morning to do a 75/75 (w/windows) calibration and it worked very nicely! Clipping pattern is nice too. There are still menu navigation problems though:

1. Whenever I hit top menu button it goes to windowed luminance sweeps
2. There is no way within sweeps to go up 1 level, can this be assigned to the return button?

The grayscale ramps are important because all of the color work at saturation <100% depend on gamma, so having those in windowed and APL will be needed.

thanks!
post #139 of 631
Did not know.
Now I know.
Thanx.
post #140 of 631
What patterns calibrate my TV LED Samsung UE55B7000?
post #141 of 631
Thread Starter 
Please see first post with link to b4.3.2

this release include greyscale patterns for both 10&1% windows
also the top menu navigation should now take you to the main menu.

regarding 1 level up navigation - The only way to do this is via a pop-up menu - this is now very high on my list

my priority list is now:
Color Test Patterns
pop-up navigation
Mp4 version/Bluray Version (however this is not until the disk is complete)

please comment
post #142 of 631
Greyscale pattern?
post #143 of 631
Quote:
Originally Posted by visca blaugrana View Post

Please see first post with link to b4.3.2

this release include greyscale patterns for both 10&1% windows
also the top menu navigation should now take you to the main menu.

regarding 1 level up navigation - The only way to do this is via a pop-up menu - this is now very high on my list

my priority list is now:
Color Test Patterns
pop-up navigation
Mp4 version/Bluray Version (however this is not until the disk is complete)

please comment

Thanks for fixing the top menu button. Greyscale patterns work fine and the 25% APL is a good place to work for plasmas with "gamma lift", I can easily measure the contrast enhancement in the 10,20, and 30% levels. One small nitpick - the 5% steps icon is oversized in both menus.

 

Red=1% on 25% grey background

Blue=10% windows
LL


Edited by zoyd - 6/10/12 at 5:44pm
post #144 of 631
Thread Starter 
good to see they are to use.

I have updated first post with b.4.3.3
this include the color test patterns, and the size for the 5% greyscale menu is now same size.

next step: popup navigation
post #145 of 631
Beatyfull!
post #146 of 631
Here is a new version of the target spreadsheet which includes the bt.1886 gamma checker. It also now auto calculates the targets for arbitrary average gamma.

 

GCD_targets v4.xlsx.zip 91.470703125k . file
post #147 of 631
Super!
post #148 of 631
Visca Blaugrana and Zoyd!
This disk only gamma 2.2 or it can be used for different gamma?
post #149 of 631
Any gamma - use the spreadsheet to calc targets
post #150 of 631
Quote:
Originally Posted by visca blaugrana View Post
good to see they are to use.

I have updated first post with b.4.3.3
this include the color test patterns, and the size for the 5% greyscale menu is now same size.

next step: popup navigation
Checked out color patterns and they look good, will be doing some comparisons between full saturation and 75%, 50% calibrations using the color checker patterns to grade the result. I think the spreadsheet is complete as well, this version includes targets for user measured gamma of arbitrary shape.

 

GCD_targets v5.xlsx.zip 114.8798828125k . file
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