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Date: Tue, 22 May 2012 10:47:37 +0200
Message-ID: <CAAQHdpC=yuUDo61b1p1TfeN6uTkMW0Oy1taif-WzWVBx-YOrBA@mail.gmail.com>
Subject: Re: thx for responding to gradient question
From: Py Fave <pyfave@gmail.com>
To: Sixtus Beckmesser <sbeckmesser@gmail.com>, 
	After Effects Mail List <AE-List@media-motion.tv>
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lets keep this on the list. i am curious of other people's responses

as i see it ,the problem is in the media.
if you can't display more than 8 bit colors  ,
you're stuck.

professional systems use SDI connexions on expensive monitors mostly to get
these things  solved.
i don't know exactly in video , but in (digital) cinema , you can keep your
image 16 bits on screen .
(dpx or tiff support this, f. i.)


anyway , if it is for color calibration, don't consider that the probe will
be aligned on a pixel .
it will give a median value from surrounding pixels , this will smooth out
your values .

and if you use the "noise" trick (in fact it is called stochastic
distribution or something like this :-)
it will give pretty good values.

if you HAVE to output bluray , it will be 8 bits.

16 bits is not affordable  for consumer market  now .
tell me if i'm wrong please .

"I'd be eternally grateful." hehe
have a nice day


Thanks for responding to my query about gradients. You're the first one to
> do so.
>
> The MPEG-4 encoders for all Blu-ray require 8-bit video in YUV form, which
> is one of the primary faults of the system. Using ten bit RGB as input to
> an 8-bit YUV format won't help matters if the results are still rounded off
> to 8 bits with the same round-off errors as with 8-bit originals.
>
> I realize adding noise will smooth gradients, but these are test patterns
> where I need the Blu-ray players to produce the PRECISE values I intend so
> as to test the gradient response of the SCREENS!
>
> Attached is the file I've been trying to encode without success. Note on
> the horizontal axis every pixel value between 16 and 235 appears for
> precisely the same amount of time (except for some stuff going on near the
> left edge). With every encoding procedure I've tried, either some pixel
> values are repeated or are repeated, with consequent increased banding on
> playback.
>
> Thx again for your attention and if you can figure out how to do this I'd
> be eternally grateful.
>
> David
>

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lets keep this on the list. i am curious of other people&#39;s responses<br=
><br>as i see it ,the problem is in the media.<br>if you can&#39;t display =
more than 8 bit colors=A0 ,<br>you&#39;re stuck.<br><br>professional system=
s use SDI connexions on expensive monitors mostly to get these things=A0 so=
lved.<br>

i don&#39;t know exactly in video , but in (digital) cinema , you can keep =
your image 16 bits on screen .<br>(dpx or tiff support this, f. i.)<br><br>=
<br>anyway , if it is for color calibration, don&#39;t consider that the pr=
obe will be aligned on a pixel .<br>

it will give a median value from surrounding pixels , this will smooth out =
your values .<br><br>and if you use the &quot;noise&quot; trick (in fact it=
 is called stochastic distribution or something like this :-)<br>it will gi=
ve pretty good values.<br>

<br>if you HAVE to output bluray , it will be 8 bits.<br><br>16 bits is not=
 affordable=A0 for consumer market=A0 now .<br>tell me if i&#39;m wrong ple=
ase .<br><br> &quot;I&#39;d be eternally grateful.&quot; hehe <br>have a ni=
ce day<br>

<br><div class=3D"gmail_quote"><br><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>Tha=
nks for responding to my query about gradients. You&#39;re the first one to=
 do so.</div>

<div><br></div>The MPEG-4 encoders for all Blu-ray require 8-bit video in Y=
UV form, which is one of the primary faults of the system. Using ten bit RG=
B as input to an 8-bit YUV format won&#39;t help matters if the results are=
 still rounded off to 8 bits with the same round-off errors as with 8-bit o=
riginals.<div>


<br></div><div>I realize adding noise will smooth gradients, but these are =
test patterns where I need the Blu-ray players to produce the PRECISE value=
s I intend so as to test the gradient response of the SCREENS!=A0</div><div=
>


<br></div><div>Attached is the file I&#39;ve been trying to encode without =
success. Note on the horizontal axis every pixel value between 16 and 235 a=
ppears for precisely the same amount of time (except for some stuff going o=
n near the left edge). With every encoding procedure I&#39;ve tried, either=
 some pixel values are repeated or are repeated, with consequent increased =
banding on playback.</div>


<div><br></div><div>Thx again for your attention and if you can figure out =
how to do this I&#39;d be eternally grateful.</div><div><br></div><div>Davi=
d</div>
</blockquote></div><br>

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