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<font face="Tahoma">Thanks, Ted, for the supplemental detail. All
interesting.<br>
<br>
<br>
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<div class="moz-cite-prefix">On 5/18/14, 12:33 AM, Ted Langdell
wrote:<br>
</div>
<blockquote
cite="mid:BB066041-665E-400A-B23D-8AD6E4FA6A38@quadvideotapegroup.com"
type="cite">
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<div>On May 17, 2014, at 7:17 PM, <a moz-do-not-send="true"
href="mailto:couryhouse@aol.com">couryhouse@aol.com</a>
wrote:</div>
<div id="role_body" bottommargin="7" leftmargin="7"
rightmargin="7" topmargin="7" style="color: rgb(0, 0, 0); "><font
id="role_document" color="#000000">
<div>
<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>
<blockquote class="webkit-indent-blockquote" style="margin: 0 0 0
40px; border: none; padding: 0px;">
<div>
<div><a moz-do-not-send="true"
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 moz-do-not-send="true"
href="mailto:park@videopark.com">park@videopark.com</a>
writes:<br>
<div id="role_body" bottommargin="7" leftmargin="7"
rightmargin="7" topmargin="7" style="color: rgb(0, 0, 0); "><font
id="role_document" color="#000000">
<div><font style="background-color: transparent; "
color="#000000">
<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>
<blockquote class="webkit-indent-blockquote" style="margin: 0 0 0
40px; border: none; padding: 0px;">
<div>
<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 moz-do-not-send="true"
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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40px; border: none; padding: 0px;">
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<div
style="font-size:
17px; "><font
class="Apple-style-span" style="font-size: 17px; " size="3"><span
class="Apple-style-span"
style="font-size:
15px; ">Ted</span></font></div>
<div
style="font-size:
14px; "><font
class="Apple-style-span" size="3"><span class="Apple-style-span"
style="font-size:
12px; "><br>
</span></font></div>
<div
style="font-size:
14px; "><font
class="Apple-style-span" size="3"><span class="Apple-style-span"
style="font-size:
12px; ">Ted
Langdell</span></font></div>
<div
style="font-size:
14px; "><span
class="Apple-style-span" style="font-size: 12px; ">Secretary</span></div>
<div
style="font-size:
14px; "><font
class="Apple-style-span" size="3"><span class="Apple-style-span"
style="font-size:
12px; ">Skype: <span
class="Apple-tab-span" style="white-space: pre; "> </span>TedLangdell</span></font></div>
<div
style="font-size:
14px; "><font
class="Apple-style-span" size="3"><span class="Apple-style-span"
style="font-size:
12px; ">e-mail:<span
class="Apple-tab-span" style="white-space: pre; "> </span><a
moz-do-not-send="true"
href="mailto:ted@quadvideotapegroup.com">ted@quadvideotapegroup.com</a></span></font></div>
<div
style="font-size:
14px; "><font
class="Apple-style-span" size="3"><br>
</font></div>
</span></div>
</span></div>
</span></span></div>
</div>
</div>
</span></div>
</span></div>
</span></div>
</span></div>
</span></div>
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</span></div>
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line-height: normal; word-wrap:
break-word; -webkit-nbsp-mode: space;
-webkit-line-break: after-white-space; ">
<div style="word-wrap: break-word;
-webkit-nbsp-mode: space;
-webkit-line-break: after-white-space;
">
<div>
<div style="font-size: medium; ">
<div>
<div style="word-wrap:
break-word; -webkit-nbsp-mode:
space; -webkit-line-break:
after-white-space; ">
<div style="word-wrap:
break-word;
-webkit-nbsp-mode: space;
-webkit-line-break:
after-white-space; ">
<div style="word-wrap:
break-word;
-webkit-nbsp-mode: space;
-webkit-line-break:
after-white-space; ">
<div style="word-wrap:
break-word;
-webkit-nbsp-mode:
space;
-webkit-line-break:
after-white-space; ">
<div>
<div>
<div>
<div>
<div
style="margin-top:
0px;
margin-right:
0px;
margin-bottom:
0px;
margin-left:
0px; font:
normal normal
normal
12px/normal
Helvetica;
line-height:
19px; "><font
class="Apple-style-span" size="3">
<div
style="color:
rgb(0, 0, 0);
margin-top:
0px;
margin-right:
0px;
margin-bottom:
0px;
margin-left:
0px; font:
normal normal
normal
12px/normal
Helvetica; "><b>Seventh
Annual Quad
Videotape
Group Dinner
at AMIA: 7pm,
Tuesday,
October 7.
2014,
Savannah,
Georgia</b></div>
<div
style="color:
rgb(0, 0, 0);
margin-top:
0px;
margin-right:
0px;
margin-bottom:
0px;
margin-left:
0px; font:
normal normal
normal
12px/normal
Helvetica; "><b>Eighth
Annual Quad
Videotape
Group Lunch at
NAB: 12:30pm
on Tuesday,
April 14,
2015, Las
Vegas
Convention
Center</b></div>
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