GCD - Gamut Calibration Disk - Page 20

Originally Posted by visca blaugrana 

I agree about the clip pattern, and will update in next release
regarding the dynamic range patterns, I just checked and Calman 5 does request 255,255,255 at 109% and since as he also says 108% is 253,253,253, this will explaine that the luminance is higher at 109% despite still not displaying 255,255,255
I will remember to bring this up when we incorperate the disk in to calman
i guess the real question will 255 be displayed as 254? (i will need to test this.)

Originally Posted by vega509 

I came across this thread looking for small window patterns to use with my plasma. Nice work visca.

I ran a comparison using GCD window patterns and AVCHD709 window patterns for grayscale and found the gamma levels were lower on the GCD disc, 2.26 vs 2.35. I used the DVD versions of both in my Panasonic BD655 BlueRay player on a Pioneer 151hd plasma, using a i1Display Pro profiled against a i1Pro, in HCFR.

The RGB, color level, and gamut were very close.

Is this difference in average gamma significant enough to be concerned about? Is the difference intentional, or is there something in my equipment causing this?

Thank you for your work.

Originally Posted by realzven 

vega509, did you compare the Small APL from AVS and the APL (1%or 10% ?) from GCD ?

What is your plasma ?

Originally Posted by KeitaroSan 

Hello guys,

i want generate image patterns (0..255) of saturation colors (all levels). In the first post, exist a spreadsheet with all RGB values, but this values is in 16..235. Can i expand this values?
eg.:
RED 75L/75S
165,60,60 expand to 173,51,51

other:
YELLOW 75L/50S
178,178,121 expand to 189,189,122

This is correct?

Other question, how this RGB values were calculated? In the spreadsheet, this values are absolute and not formula.

Thanks for attention and sorry my bad english

Originally Posted by visca blaugrana 


2:@PlasmaPZ80U when using Calman5 with generic calibration disk I would use AVSHD709 unless you are calibrating with 100% luminance, if so both disk are usable - the reason behind this is that the RGB's requested by Calman does not match the one used on GCD (GCD uses fixed luminance patterns and Calman5 ask for variable lumininace patterns) - I am working with SpectraCal to find a solution on this.

regarding the 100% luminance I'm talking about CMS work.

if you are calibrating to 100% luminance (again CMS work) either disk will work, then its just a matter of what pattern size you prefere.
if you are calibrating to lets say 75% luminance I would use AVSHD7090with calman reason why:

in calman for Red 75saturation/70% luminance it expect 180,64,64 this will give you the correct x,y values but not the correct amplitude (I.E. 75%) to get the 75% Amplitude it would be 167,60,60. Again this is not wrong but all about how the software work. GCD was at that point build for Chromapure. But as I said I am working with Calman so GCD will be incorperated

Originally Posted by anta1974 

Dear Zoyd! In GCD_targets_v13.xlsx
Why values patterns differ in 12pt Color checker patterns and 24pt Color checker patterns ?


What right?

Originally Posted by anta1974 

Thank you very much!

Originally Posted by PeterLewis 

I noticed on my tv GT30 that it does not like the 10% APL patterns at 20-30 ire. As the blue RGB bar falls under 90%.

Originally Posted by PeterLewis 

Ok,here is my calibrated rgb graph in 10%standard windows followed by the GCD and AVS APL's (Using colormunki display and a panny BDT310 set to default)


GCD 10% APL (Blue reads 95 at 30 ire and 20ire flew out the window)

Originally Posted by zoyd 

Don't know what you mean by "flew out the window" here, it looks like that at 20ire red/blue are a little high and green a little low.

The 1%APL is interesting and I will check the patterns to make sure, but it looks like a real effect generated by your display since it holds on from 30-50%

Originally Posted by PeterLewis 

I meant that it read blue kind of high around 108%...

I would say 20,30 and 40 ire on both apl sizes on GCD show weird annomalies with the blue on my display...The standard 10% are just fine as I got a good calibration out of them..

I just wanted to try the 10% apl as many have recommended for plasma with abl...Thanks Zoyd.

Originally Posted by zoyd 

In general the GCD patterns induce the display to produce more blue at levels below 40%, anywhere from 2-5 dEu'v'. So for calibration purposes the question is then which of these patterns better represents the state of the display during actual video content?

PL....On your Samsung the GCD apl's induce and produce more blue but on my display it subtracts blue from the mid 80's - 90's from around 20,30-40 ire patterns.

The avs apl do induce more blue down the low end though...

I have to check out the new spears equal energy patterns when they come out to see what happens.