<div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">пт, 16 июл. 2021 г., 09:36 Andrea paz via Cin <<a href="mailto:cin@lists.cinelerra-gg.org" target="_blank" rel="noreferrer">cin@lists.cinelerra-gg.org</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I made a forum post to keep track of the repository. So if a request<br>
is made we can direct to that post.<br>
<br>
<a href="https://www.cinelerra-gg.org/forum/help-video/francebb-luts-for-space-color-conversions/" rel="noreferrer noreferrer noreferrer" target="_blank">https://www.cinelerra-gg.org/forum/help-video/francebb-luts-for-space-color-conversions/</a></blockquote></div></div><div dir="auto"><br></div><div dir="auto">It was updated yesterday with interesting message:</div><div dir="auto"><br></div><div dir="auto"><a href="https://forum.doom9.org/showpost.php?p=2018552&postcount=310" target="_blank" rel="noreferrer">https://forum.doom9.org/showpost.php?p=2018552&postcount=310</a></div><div dir="auto"><br></div><div dir="auto">==== quotation start === </div><div dir="auto"><br></div><div dir="auto">This feature was requested by ossnorry.<br>
As a bit of history, in 1953 the NTSC version of BT601 was born, however
the tube phosphors originally used by the TVs of the time had issues
displaying those values and the standard was later changed (reduced) in
1987 to make life easier for the hardware of the time, however one
country never stopped using the original NTSC version and that country
is Japan, which is why the original NTSC version has become known as
"NTSC-J" which stands for "Japan".<br>
<br>
Anyway, the old BT601 NTSC Japan (1953) is based on the following values:<br>
<br>
x white = 0.3100<br>
y white = 0.3160<br>
x red = 0.670<br>
y red = 0.330<br>
x green = 0.210<br>
y green = 0.710<br>
x blue = 0.140<br>
y blue = 0.080<br>
<br>
and is indicated with<br>
--colormatrix smpte170m --transfer bt470m --colorprim bt470m<br>
<br>
while the normal BT601 NTSC SMPTE C (1987) that all other NTSC countries adopted has the following values:<br>
<br>
x white = 0.3127<br>
y white = 0.3290<br>
x red = 0.630<br>
y red = 0.340<br>
x green = 0.310<br>
y green = 0.595<br>
x blue = 0.155<br>
y blue = 0.070<br>
<br>
and is indicated with:<br>
--colormatrix smpte170m --transfer smpte170m --colorprim smpte170m<br>
<br>
<br>
As you can see, all values are different, including the white point.</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto">=== end of quotation ====</div><div dir="auto"><br></div><div dir="auto">I surely recall Japan was different, but it completely evaded my mind that old NTSC 1953 was still in use there up to relatively modern times!</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto">cc ffmpeg-users because it tend to be more popular list, so visibility will be higher.</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
-- <br>
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</blockquote></div></div></div>