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<DIV>OK! Great info Ted.</DIV>
<DIV>Most of what I deal with is B/W</DIV>
<DIV> </DIV>
<DIV>but the banding I see in the edits we do on color
news stuff if it is 8 bit in Sony Vegas.. and goes away
when I go 32 but.</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 5/17/2014 9:34:00 P.M. US Mountain Standard Time,
ted@quadvideotapegroup.com writes:</DIV>
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<DIV>On May 17, 2014, at 7:17 PM, <A title=mailto:couryhouse@aol.com
href="mailto:couryhouse@aol.com">couryhouse@aol.com</A> wrote:</DIV>
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<BLOCKQUOTE type="cite">I just bring it into digital and hit
the save a still in Sony Vegas... or if
I am watching analog footage in windows media
player I do a screen
capture..... </BLOCKQUOTE></DIV></FONT></DIV></DIV>
<DIV><BR></DIV>I think what Park meant by "capture an image" was "digitize
video" not make a still.
<DIV>
<DIV><BR></DIV>
<DIV>His particular process converts composite video to component using the
Accom D-Bridge 10-bit decoder before capture as a file... say as 10-bit YUV
4:2:2 in a Quicktime wrapper.</DIV>
<DIV><BR></DIV>
<DIV>The D-Bridge products (122 and 221) have roots in companies formed by
former Ampex engineers:</DIV></DIV>
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<DIV><A title=http://www.abekas.com/main/history//page1059.htm
href="http://www.abekas.com/main/history//page1059.htm">http://www.abekas.com/main/history//page1059.htm</A></DIV></DIV>
<DIV><BR></DIV>
<DIV>They were intended to "Bridge" the analog to digital process, including
analog composite, D1 parallel and D2 composite.</DIV>
<DIV><BR></DIV></BLOCKQUOTE>
<DIV>
<DIV>In a message dated 5/17/2014 4:52:15 P.M. Mountain Standard Time, <A
title=mailto:park@videopark.com
href="mailto:park@videopark.com">park@videopark.com</A> writes:<BR>
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<DIV>
<BLOCKQUOTE type="cite">This is a low band color image from the late 60s,
taken with a TK-42. Notice the lack of banding, hanging dots and
cross-color contamination.</BLOCKQUOTE></DIV></FONT></DIV></FONT></DIV></DIV>
<DIV><BR></DIV>
<DIV>The word "banding" can mean two things as related to this post:
</DIV>
<DIV><BR></DIV></DIV>
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<DIV>Quad banding... where one sees variations every 16 lines (NTSC) caused
by differences in reproduction by each head (EQ, luma, chroma levels for
example.)</DIV></DIV>
<DIV><BR></DIV>
<DIV>Or noticeable bands in light to dark areas of the picture caused by the
number of bits used in the digitization process. </DIV>
<DIV><BR></DIV>
<DIV>You might see this on say a cyc wall where the top is darker than the
bottom. Skies are also an example of where banding might easily occur.
</DIV>
<DIV><BR></DIV>
<DIV>An 8-bit digitization step (255 steps per color) might be more likely
to cause a noticeable bands of luma or chroma. 10-bit digitization provides
1023 steps per color, so banding is less likely to occur.</DIV>
<DIV><BR></DIV>
<DIV>Here's Larry Jordan's take on it with a visual example (originally
written in 2007 when ProRes was released):</DIV>
<DIV><A title=http://www.larryjordan.biz/why-video-bit-depth-matters/
href="http://www.larryjordan.biz/why-video-bit-depth-matters/">http://www.larryjordan.biz/why-video-bit-depth-matters/</A></DIV>
<DIV><BR></DIV></BLOCKQUOTE>More bits and a better representation of the
original analog signal is one reason why the generally preferred Archival file
for SD is 10-bit YUV 4:2:2, and in a Quicktime wrapper, although some
archives use AVI if they're PC based.<BR>
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<DIV style="FONT-SIZE: 17px"><FONT style="FONT-SIZE: 17px"
class=Apple-style-span size=3><SPAN style="FONT-SIZE: 15px"
class=Apple-style-span>Ted</SPAN></FONT></DIV>
<DIV style="FONT-SIZE: 14px"><FONT class=Apple-style-span size=3><SPAN
style="FONT-SIZE: 12px" class=Apple-style-span><BR></SPAN></FONT></DIV>
<DIV style="FONT-SIZE: 14px"><FONT class=Apple-style-span size=3><SPAN
style="FONT-SIZE: 12px" class=Apple-style-span>Ted
Langdell</SPAN></FONT></DIV>
<DIV style="FONT-SIZE: 14px"><SPAN style="FONT-SIZE: 12px"
class=Apple-style-span>Secretary</SPAN></DIV>
<DIV style="FONT-SIZE: 14px"><FONT class=Apple-style-span size=3><SPAN
style="FONT-SIZE: 12px" class=Apple-style-span>Skype: <SPAN
style="WHITE-SPACE: pre" class=Apple-tab-span>
</SPAN>TedLangdell</SPAN></FONT></DIV>
<DIV style="FONT-SIZE: 14px"><FONT class=Apple-style-span size=3><SPAN
style="FONT-SIZE: 12px" class=Apple-style-span>e-mail:<SPAN
style="WHITE-SPACE: pre" class=Apple-tab-span> </SPAN><A
title=mailto:ted@quadvideotapegroup.com
href="mailto:ted@quadvideotapegroup.com">ted@quadvideotapegroup.com</A></SPAN></FONT></DIV>
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<DIV style="MARGIN: 0px; FONT: 12px Helvetica; COLOR: rgb(0,0,0)"><B>Seventh
Annual Quad Videotape Group Dinner at AMIA: 7pm, Tuesday, October 7.
2014, Savannah, Georgia</B></DIV>
<DIV style="MARGIN: 0px; FONT: 12px Helvetica; COLOR: rgb(0,0,0)"><B>Eighth
Annual Quad Videotape Group Lunch at NAB: 12:30pm on Tuesday, April 14,
2015, Las Vegas Convention
Center</B></DIV></FONT></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></SPAN></DIV></SPAN></DIV></SPAN></DIV></DIV></DIV><BR
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