Talk:GreyScale - Revision history

Raffriff42: reply

2016-01-18T00:59:59Z

Admin: added comment

2016-01-17T21:58:10Z

added comment

Raffriff42: reply

2016-01-17T16:09:56Z

Reel.Deal: RGB behavior

2016-01-17T15:07:34Z

RGB behavior

New page

[[Category:Talk]]
===RGB behavior===
This statement was recently removed from the documentation:

:''In RGB based formats, the conversion produces the luma using the coefficients given in the matrix parameter (rec601 by default, which reflects the behaviour in old AviSynth versions).''

With the following script you can see that using Grayscale() on a RGB source actually uses the "PC.601" matrix, at least in AviSynth 2.6.
<pre>
ColorBars()

gray = Grayscale().Subtitle("Grayscale")

pc601 = ConvertToY8(matrix="PC.601")
pc601 = MergeRGB(pc601, pc601, pc601).Subtitle("PC.601")

rec601 = ConvertToY8(matrix="Rec601")
rec601 = MergeRGB(rec601, rec601, rec601).Subtitle("Rec601")

Interleave(gray, pc601, rec601)

#ShowRed("YV12").Histogram("levels")
</pre>

← Older revision		Revision as of 00:59, 18 January 2016
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	::I hope you don't mind, but i changed it back a little bit. To keep the naming consistent with [[Convert]] we should have used PC.601 and PC.709 as matrices, but we didn't (and it's too late to change it). However when talking about coefficients, note that Rec601 and PC.601 use both the same Rec601 coefficients (idem for Rec709 and PC.709). The coefficients and the luma range are unrelated since the coefficients refer to the normalized transformations. [[User:Admin\|Admin]] 22:58, 17 January 2016 (CET)		::I hope you don't mind, but i changed it back a little bit. To keep the naming consistent with [[Convert]] we should have used PC.601 and PC.709 as matrices, but we didn't (and it's too late to change it). However when talking about coefficients, note that Rec601 and PC.601 use both the same Rec601 coefficients (idem for Rec709 and PC.709). The coefficients and the luma range are unrelated since the coefficients refer to the normalized transformations. [[User:Admin\|Admin]] 22:58, 17 January 2016 (CET)
		+
		+	::Not at all, that works for me. --[[User:Raffriff42\|Raffriff42]] 01:59, 18 January 2016 (CET)

← Older revision		Revision as of 21:58, 17 January 2016
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	::''In all cases, Luma range is not changed''		::''In all cases, Luma range is not changed''
	:Perhaps it can be worded better? I will try something. --[[User:Raffriff42\|Raffriff42]] 17:09, 17 January 2016 (CET)		:Perhaps it can be worded better? I will try something. --[[User:Raffriff42\|Raffriff42]] 17:09, 17 January 2016 (CET)
		+
		+	::I hope you don't mind, but i changed it back a little bit. To keep the naming consistent with [[Convert]] we should have used PC.601 and PC.709 as matrices, but we didn't (and it's too late to change it). However when talking about coefficients, note that Rec601 and PC.601 use both the same Rec601 coefficients (idem for Rec709 and PC.709). The coefficients and the luma range are unrelated since the coefficients refer to the normalized transformations. [[User:Admin\|Admin]] 22:58, 17 January 2016 (CET)

← Older revision		Revision as of 16:09, 17 January 2016
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	#ShowRed("YV12").Histogram("levels")		#ShowRed("YV12").Histogram("levels")
	</pre>		</pre>
		+	:That is true, but the name "Rec601" is hard coded into the filter. This is why I explained that
		+	::''In all cases, Luma range is not changed''
		+	:Perhaps it can be worded better? I will try something. --[[User:Raffriff42\|Raffriff42]] 17:09, 17 January 2016 (CET)