GCD - Gamut Calibration Disk - AVS Forum
View Poll Results: What format would you prefer for the HTPC?
.mp4 22 31.88%
.mkv 46 66.67%
others (please detail in thread) 1 1.45%
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post #1 of 633 Old 04-19-2012, 01:19 PM - Thread Starter
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As I think most calibrations disk available today lack in-debt calibrations patterns for Gamut calibration, I decided to create one my self, the goal with this is not to create a disk for full calibration, as there is plenty of disks available for this, its only for gamut calibration.

b4.3.13 is the latest beta version of the disk in AVCHD format (This need burning to a DVD)

b4.3.13 is the latest beta version of the disk in Blu Ray format (This need burning to a BD)

b4.3.13 is the latest beta version of the disk in mp4 format (This can be used from a HTPC)
if any problems please shout up

b4.3.13 is the latest beta version of the disk in .mkv format

a5.0.0 Only contain CALMAN patterns and the basic patterns - More will follow.


Just a quick guide to what format to chose:

Use the Blu-Ray version if you wish to burn to a Blu-Ray disk (BD25 or DB50) - use this format if your blu-ray player dont support 1080p/24fps via AVCHD (reports suggest that panasonic players dont)


Use the AVCHD in when burning to a DVD but blu ray playback


fix list:

known bugs:

None

100% luminance - Saturation Sweep
75% luminance - Saturation Sweep\t\t\t\t
50% luminance - Saturation Sweep\t\t\t\t
25% luminance - Saturation Sweep\t\t\t\t
\t\t\t\t
100% Saturation - luminance Sweep\t\t\t\t
75% Saturation - luminance Sweep\t\t\t\t
50% Saturation - luminance Sweep\t\t\t\t
25% Saturation - luminance Sweep

100% luminance - 100% Saturation: Primaries/Secondaries Sweep\t
100% luminance - 75% Saturation: Primaries/Secondaries Sweep\t
100% luminance - 50% Saturation: Primaries/Secondaries Sweep\t

75% luminance - 100% Saturation: Primaries/Secondaries Sweep\t
75% luminance - 75% Saturation: Primaries/Secondaries Sweep\t
75% luminance - 50% Saturation: Primaries/Secondaries Sweep\t

50% luminance - 100% Saturation: Primaries/Secondaries Sweep\t
50% luminance - 75% Saturation: Primaries/Secondaries Sweep\t
50% luminance - 50% Saturation: Primaries/Secondaries Sweep

Grey Scale Patterns 5 & 10% steps
Clip Pattern
Color Test Patterns

Reference pictures


Future Plans:

MP4 version

Others??

attached is the xyY targets for all patterns. Big thanks to Zoyd for his big work in creating this disk.
GCD_targets_v13.xlsx 254k .xlsx file
Thanks alluringreality & dr1394 for helping with utility's to make this possible
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post #2 of 633 Old 04-19-2012, 01:59 PM - Thread Starter
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Quote:
Originally Posted by zoyd View Post
I'll give one example, red at 75% saturation, 100% luminance

Step 1: red(709) x=.640, y=.330, Y=21.26, white(709) x=.3127, y=.3290, Y=100

75% saturation x= .75*(redx-whitex)+whitex = .5582
75% saturation y= .75*(redy-whitey)+whitey = .3298

Step 2: Convert x,y,Y to X Y Z using this formula

Step 3: Convert X Y Z to R G B (0-1) using this formula

Step 4: Convert RGB(0-255) to RGB(16-235): R(0-255)=R(0-255)/255*219+16

Step 5: round result to nearest integer
to be completely honest this is over my head
I can however follow the example and I also get the same result as you on the 2 examples I have done.

could you please have a quick look at attached sheet with the rgb% from tom (again I assume the gamma is 2.22) - could the difference of a gamma at 2.2 and 2.22 really cause the difference on up to 6 (as it is for some 50% luminance?)

unfortunately I cannot help a lot on this - I just assumed what I was given from Tom Huffman was correct. It would be interesting to hear Tom's take on this.

Did you manually calculate all the RGB values or do you have a spreadsheet with your calculations?

 

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post #3 of 633 Old 04-19-2012, 04:19 PM
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Quote:
Originally Posted by visca blaugrana View Post

to be completely honest this is over my head
I can however follow the example and I also get the same result as you on the 2 examples I have done.

could you please have a quick look at attached sheet with the rgb% from tom (again I assume the gamma is 2.22) - could the difference of a gamma at 2.2 and 2.22 really cause the difference on up to 6 (as it is for some 50% luminance?)

unfortunately I cannot help a lot on this - I just assumed what I was given from Tom Huffman was correct. It would be interesting to hear Tom's take on this.

Did you manually calculate all the RGB values or do you have a spreadsheet with your calculations?

I gave you % values, not digital values.
2.22 gamma is assumed.
In PC digital 100% is 255. In video digital 100% is 235. In any case, I am not sure that this is even important. I know that when I created a disc and had to convert my % values into digital values, the software used 0-255, but the resulting disc seemed to output correctly. The more important issue is gamma, which really makes a big difference in the % values.

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post #4 of 633 Old 04-19-2012, 08:01 PM
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Quote:
Originally Posted by visca blaugrana View Post

to be completely honest this is over my head
I can however follow the example and I also get the same result as you on the 2 examples I have done.

could you please have a quick look at attached sheet with the rgb% from tom (again I assume the gamma is 2.22) - could the difference of a gamma at 2.2 and 2.22 really cause the difference on up to 6 (as it is for some 50% luminance?)

unfortunately I cannot help a lot on this - I just assumed what I was given from Tom Huffman was correct. It would be interesting to hear Tom's take on this.

Did you manually calculate all the RGB values or do you have a spreadsheet with your calculations?

It's not a problem with gamma, the differences are random and most quite small. It looks more like rounding problems. So unless there is something wrong with the formulas I linked to I don't know where the differences come from. I ported the formulas to IDL (somewhat like MATLAB software) and generated all the values in high precision and then rounded.

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post #5 of 633 Old 04-20-2012, 01:20 AM
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The formula in step 3 is for sRGB gamma, not 2.22 gamma. They're similar, but different.
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post #6 of 633 Old 04-20-2012, 06:04 AM
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Quote:
Originally Posted by ams2990 View Post

The formula in step 3 is for sRGB gamma, not 2.22 gamma. They're similar, but different.

Thanks for catching that! I recalculated with the proper companding and the agreement is much better although not perfect yet.

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post #7 of 633 Old 04-20-2012, 06:58 AM
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Here is the revised comparison with gamma=2.22 and proper gamma companding. I also used the more precision conversion matrix from brucelindbloom.com rather than the one at easyrgb. The 100% saturation codes at all luminances agree exactly with Tom's, there are still discrepancies at 75% 50%, and 25% saturations that increase as luminance decreases. I suspect the difference is in how we calculated the x,y positions of the reduced saturation points. Tom, can you describe how you came up with your percentages?

 

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post #8 of 633 Old 04-20-2012, 09:00 AM
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Quote:
Originally Posted by zoyd View Post

Here is the revised comparison with gamma=2.22 and proper gamma companding. I also used the more precision conversion matrix from brucelindbloom.com rather than the one at easyrgb. The 100% saturation codes at all luminances agree exactly with Tom's, there are still discrepancies at 75% 50%, and 25% saturations that increase as luminance decreases. I suspect the difference is in how we calculated the x,y positions of the reduced saturation points. Tom, can you describe how you came up with your percentages?

What discrepancies? They look the same to me.

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post #9 of 633 Old 04-20-2012, 09:11 AM
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Quote:
Originally Posted by TomHuffman View Post

What discrepancies? They look the same to me.

they aren't large:

max difference at 100% luminance: magenta @25% saturation, difference = 2 codes

75% luminance: several with 2 code difference

50% luminance: several with 4 code difference

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post #10 of 633 Old 04-20-2012, 10:57 AM
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Quote:
Originally Posted by zoyd View Post

they aren't large:

max difference at 100% luminance: magenta @25% saturation, difference = 2 codes

75% luminance: several with 2 code difference

50% luminance: several with 4 code difference

We must be looking at something different. Magenta 25% saturation, 100% luminance, we both have
R 64%
G 53%
B 64%

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post #11 of 633 Old 04-20-2012, 11:07 AM
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If you are looking at the last spreadsheet I attached, your values are in percent at the top. These were used to calculated 16-235 codes by visca blaugrana (also in top half). The bottom half contain my calculated codes along with the differences in RGB codes labeled "zoyd-visca blaugrana".

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post #12 of 633 Old 04-20-2012, 11:54 AM
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Quote:
Originally Posted by zoyd View Post

If you are looking at the last spreadsheet I attached, your values are in percent at the top. These were used to calculated 16-235 codes by visca blaugrana (also in top half). The bottom half contain my calculated codes along with the differences in RGB codes labeled "zoyd-visca blaugrana".

All that I can vouch for is the % values. These are correct. Regarding the conversion between % values and digital values, because--given the PC/Video range distinction--it is unclear to me what the proper methodology for this is. Indeed, given how different software, video cards, and even displays interpret this data, it is not even clear to that there is ONE correct methodology for this.

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post #13 of 633 Old 04-20-2012, 12:11 PM - Thread Starter
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does this mean that the conversion between RGB% to RGB Digital is not a simple scaling (regardless of we are talking PC or Video levels)?
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post #14 of 633 Old 04-20-2012, 12:12 PM
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Quote:
Originally Posted by TomHuffman View Post

All that I can vouch for is the % values. These are correct.

I don't doubt that you did the xyY->RGB correctly but without those values I can't trace back and confirm that we are using the same starting point for conversion to RGB. Can you provide the xyY values, maybe for 2 or 3 that show the largest difference. As I mentioned earlier we are in exact agreement for all 100% saturation points and differ at <100% so I need to know how those saturation locations were derived.

I have independently run several of my xyY values through Lindbloom's calculator and the codes match exactly what I am obtaining.

Quote:


Regarding the conversion between % values and digital values, because--given the PC/Video range distinction--it is unclear to me what the proper methodology for this is. Indeed, given how different software, video cards, and even displays interpret this data, it is not even clear to that there is ONE correct methodology for this.

I don't think that's an issue, the RGB %'s you provided should be able to be applied to either full (PC) or limited (YCbCr) ranges, they are just scale factors.

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post #15 of 633 Old 04-20-2012, 04:56 PM
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Here's red

% Saturation Color x y Y X Y Z R G B R' G' B'
100% R 0.6400 0.3300 0.2126 0.41232 0.21260 0.01933 100% 0% 0% 100% 0% 0%
75% R 0.5582 0.3298 0.2126 0.35983 0.21260 0.07220 80% 5% 5% 91% 27% 27%
50% R 0.4764 0.3295 0.2126 0.30738 0.21260 0.12524 61% 11% 11% 80% 36% 36%
25% R 0.3945 0.3293 0.2126 0.25475 0.21260 0.17836 41% 16% 16% 67% 44% 44%
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post #16 of 633 Old 04-20-2012, 05:56 PM
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Quote:
Originally Posted by TomHuffman View Post

Here's red

Thanks, unfortunately that's one we agree on, how about green at 50% luminance?

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post #17 of 633 Old 04-20-2012, 06:51 PM
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% Saturation Color x y Y X Y Z R G B R' G' B'
100% G 0.3000 0.6000 0.1535 0.07675 0.15350 0.02558 0% 21% 0% 0% 50% 0%
75% G 0.3032 0.5323 0.1535 0.08743 0.15350 0.04744 2% 21% 2% 19% 49% 19%
50% G 0.3064 0.4645 0.1535 0.10125 0.15350 0.07571 5% 19% 5% 27% 48% 27%
25% G 0.3095 0.3968 0.1535 0.11973 0.15350 0.11362 10% 18% 10% 35% 46% 35%

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post #18 of 633 Old 04-20-2012, 07:29 PM
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ok, if I use the percentages you just posted the agreement is good, if I use the ones in the spreadsheet (also yours) I get some errors (max 4 codes). The spreadsheet values for G' are 1.2 - 1.6 % higher than the ones you just posted.

This is what's in the spreadsheet for Green@50%:

R' G' B'
0.0% 50.0% 0.0%
19.0% 50.6% 18.9%
27.7% 49.2% 27.6%
35.7% 47.2% 35.7%

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post #19 of 633 Old 04-20-2012, 10:12 PM
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Quote:
Originally Posted by zoyd View Post
ok, if I use the percentages you just posted the agreement is good, if I use the ones in the spreadsheet (also yours) I get some errors (max 4 codes). The spreadsheet values for G' are 1.2 - 1.6 % higher than the ones you just posted.

This is what's in the spreadsheet for Green@50%:

R' G' B'
0.0% 50.0% 0.0%
19.0% 50.6% 18.9%
27.7% 49.2% 27.6%
35.7% 47.2% 35.7%
I think this is a combination of rounding errors and I might have had a slightly different gamma selected previously. Here is an updated sheet.

 

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post #20 of 633 Old 04-21-2012, 12:59 AM - Thread Starter
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Thank you for the new numbers Tom,

I will start create the iso now, it will properly take a few days
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and just as I thought it was done and dusted

there is still a few deviations (however mainly very small) one thing i wonder if its a mistake is that according to Tom the Magenta at 100% sat/lum is 100%,2%,100%

please see attached

 

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Quote:
Originally Posted by visca blaugrana View Post

and just as I thought it was done and dusted

there is still a few deviations (however mainly very small) one thing i wonder if its a mistake is that according to Tom the Magenta at 100% sat/lum is 100%,2%,100%

please see attached

yes, that's an error, it should be 0% as in the original spreadsheet.

So which patterns will you be making for an avchd iso? I had in mind the following 7 sequences compatible with HCFR:

1. 100% luminance saturation sweep [R0,R25,R50,R75,R100, etc.]
2. 75% luminance saturation sweep [R0,R25,R50,R75,R100, etc.]
3. 50% luminance saturation sweep [R0,R25,R50,R75,R100, etc.]
4. 100/100 RGBYCMW
5. 100/75 RGBYCMW
6. 75/100 RGBYCMW
7. 75/75 RGBYCMW

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post #23 of 633 Old 04-21-2012, 04:29 AM - Thread Starter
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0% Saturation? is that really used in HCFR?

if so is that just white?

this is properly a stupid question
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post #24 of 633 Old 04-21-2012, 06:01 AM
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Quote:
Originally Posted by visca blaugrana View Post

0% Saturation? is that really used in HCFR?

if so is that just white?

this is properly a stupid question

yes, the sequence starts with 0% saturation, it's white but at the same luminance as the color that is being swept. Do you want me to post the codes for that case?

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post #25 of 633 Old 04-21-2012, 06:03 AM - Thread Starter
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Please.

I am in the middle of creating the patterns in photoshop at the moment, and is roughly half way through

see attached example note this is only a .jpeg and should not be used as reference.
LL
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post #26 of 633 Old 04-21-2012, 06:20 AM
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Quote:
Originally Posted by visca blaugrana View Post

Please.

I am in the middle of creating the patterns in photoshop at the moment, and is roughly half way through

see attached example note this is only a .jpeg and should not be used as reference.

Looks good, PS reports RGB= 75 121 75.

Here are the 0% saturation codes scaled to 16-235 assuming gamma=2.22, don't bother with the 25% luminance case.

Color/%Luminance R' G' B'
R100 125 125 125
R75 98 98 98
R50 71 71 71
R25 43 43 43
G100 204 204 204
G75 157 157 157
G50 110 110 110
G25 63 63 63
B100 83 83 83
B75 66 66 66
B50 49 49 49
B25 33 33 33
Y100 228 228 228
Y75 175 175 175
Y50 122 122 122
Y25 69 69 69
C100 213 213 213
C75 163 163 163
C50 114 114 114
C25 65 65 65
M100 140 140 140
M75 109 109 109
M50 78 78 78
M25 47 47 47

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post #27 of 633 Old 04-21-2012, 06:25 AM
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Respect Visca Blaugrana!
Why using 16-239?
My LED TV UE55B7000 work in mode 0-255.
Could you create your own patterns, and for the range 0-255?
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post #28 of 633 Old 04-21-2012, 06:31 AM
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Quote:
Originally Posted by anta1974 View Post

Respect Visca Blaugrana!
Why using 16-239?
My LED TV UE55B7000 work in mode 0-255.
Could you create your own patterns, and for the range 0-255?

He's authoring to DVD so the player will automatically expand the range if it's set to output 0-255.

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post #29 of 633 Old 04-21-2012, 06:48 AM
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Very very thanx!
Why is the gamma=2.22 but gamma=2.20?
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post #30 of 633 Old 04-21-2012, 07:32 AM - Thread Starter
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I am now ready to start encode the videos, but since that take ages I want to make sure i get the sequences right
I will start encode the first chapter when confirmed.

100% Luminance sweep: Red (Starting @ 0,25,50,75 & 100% saturation) in the following order Red, Green, Blue, Cyan, Magenta, Yellow

Is there any need of a 100% white either before or at the end?
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