XvYCC: Béda antarrépisi

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Révisi nurutkeun 13 Méi 2008 00.39

xvYCC atawa Extended-gamut YCC nyaeta hiji rohangan kelir nu dipake dina elektronika video set televisi panel rata, nu ngarojong 1.8 kalieun jumlah kelir nu dipake dina rohangan kelir sRGB.^[1] xvYCC ditetepkeun ku IEC Oktober 2005 tur dipublikasikeun Januari 2006 minangka IEC 61966-2-4. Spektrum nu leuwih lega tina backlighting LED ngaganti katoda tiis nyababkeun bisana nambah pamidang color gamut LCD.

xvYCC make jangkah ajen nu lengkep (1 tepi ka 254 dina hiji rohangan 8-bit) pikeun midangkeun kelir. Dina BT.601 jeung BT.709, kelir RGB dipidangkeun ukur ku ajen 8-bit ti 16 tepi ka 235. Jangkah nu kawates ieu dijieun keur mere lolongkrang pikeun undershoot jeung overshoot, nu mangrupakeun sipat pasinyalan TV analog. Dina pasinyalan TV digital mah, undershoot jeung overshoot teh teu aya, lusabab kitu ajen ti 1-15 katut 235-254 bisa dipake keur midangkeun kelir nu sajati. Pikeun ngajaga kacocogan ka tukang jeung standar samemehna, kelir standar beureum (red (R)), hejo (green (G)), bulao (blue (B)) jeung bodas (white) diitung keneh make susunan nu sarua dina rohangan kelir. Jangkah ajen digital nu leuwih rubak bisa mere lolongkrang keur midangkeun hejo kolot (deeper greens), beureum kolot (deeper reds), katut bulao kolot (deeper blues) - tur tangtuna oge kelir-kelir panengah nu samemehna aya dina saluareun wawates dina rohangan kelir CCIR 601.

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Even the high-definition television color space defined by BT.709 encompasses only 45 per cent of the possible values with RGB indices of 1 to 254, since those indices are limited to 16 to 234 by the BT spec. The xvYCC standard uses 1 to 254, and can encode more than twice the number of color values. (The sRGB system is in between the BT.709 and xvYCC systems, allowing use of all combinations of R, G and B values from 16 to 235 - more combinations, but not so many as in xvYCC.)

In a paper published by Society for Information Display in 2006, the authors mapped the 769 colors in the Munsell Color Cascade to the BT.709 space and to the xvYCC space. 55% of the Munsell colors could be mapped to the sRGB gamut, but 100% of those colors could map to the xvYCC gamut.^[2] Deeper hues can be created - for example a deeper red by giving the opposing color (green) a negative coefficient.

A mechanism for carrying the gamut boundary definition for xvYCC has been defined in the HDMI 1.3 Specification. Although HDMI 1.3's other new color feature, Deep Color, is not required to transport xvYCC color information, it is commonly associated with xvYCC because these features are used together in high-end CE systems to improve the viewing image quality. Above 480p and 576p, Deep Color systems should use Category 2 HDMI cables (indicated by a logo), which are qualified for link clock rates above 75MHz.^[3]

Rujukan

↑ "HDMI 1.3 Update" (PDF). HDMI Licensing. 2006. Diakses tanggal 2006-08-30.
↑ Matsumoto et al, 19.2: xvYCC: A New Standard for Video Systems using Extended-Gamut YCC Color Space, SID '06 Digest, pp. 1130-1133. Available from http://www.sid.org.
↑ For EDTV modes (480p and 576p), even the 12-bit Deep Color data can be transported across the link using a clock well below the upper bandwidth limit of Category 1 cables.

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[1] "HDMI 1.3 Update" (PDF). HDMI Licensing. 2006. Diakses tanggal 2006-08-30.

[2] Matsumoto et al, 19.2: xvYCC: A New Standard for Video Systems using Extended-Gamut YCC Color Space, SID '06 Digest, pp. 1130-1133. Available from http://www.sid.org.

[3] For EDTV modes (480p and 576p), even the 12-bit Deep Color data can be transported across the link using a clock well below the upper bandwidth limit of Category 1 cables.

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@@ Baris ka-1: / Baris ka-1: @@
 {{lowercase|xvYCC}}
 '''xvYCC''' atawa Extended-[[gamut]] [[YCbCr|YCC]] nyaeta hiji [[color space|rohangan kelir]] nu dipake dina elektronika [[video]] set televisi panel rata, nu ngarojong 1.8 kalieun jumlah kelir nu dipake dina [[sRGB color space|rohangan kelir sRGB]].<ref>{{cite web | year=2006 | url=http://www.hdmi.org/pdf/HDMI_Insert_FINAL_8-30-06.pdf | title=HDMI 1.3 Update | work=[[HDMI Licensing]] | accessdate=2006-08-30}}</ref> xvYCC ditetepkeun ku [[International Electrotechnical Commission|IEC]] Oktober 2005 tur dipublikasikeun Januari 2006 minangka [[daptar standar IEC|IEC 61966-2-4]]. Spektrum nu leuwih lega tina ''backlighting'' [[LED]] ngaganti [[cold cathode|katoda tiis]] nyababkeun bisana nambah pamidang ''color gamut'' [[liquid crystal display|LCD]].
-{{tarjamahkeun|Inggris}}
-xvYCC uses the full range of values (1 to 254 in an 8-bit space) to represent colors.  In [[BT.601]] and [[Rec. 709|BT.709]], RGB colors are represented only by 8-bit values from 16 to 235.  This limited range was established to allow for [[undershoot]] and [[overshoot]], attributes of [[analog TV]] signaling.  With [[digital TV]] signaling, there is no undershoot or overshoot, and the values from 1-15 and 235-254 can be used to represent real colors.  In order to maintain [[backward-compatibility]] with earlier standards, the red (R), green (G), blue (B) and white standard colors are still calculated at the same indices in the color space.  The wider ranges of digital values allow representation of ''deeper greens'', ''deeper reds'', and ''deeper blues'' - and of course intermediate colors previously beyond the boundary limit in the [[CCIR 601]] color space.
+xvYCC make jangkah ajen nu lengkep (1 tepi ka 254 dina hiji rohangan 8-bit) pikeun midangkeun kelir. Dina [[BT.601]] jeung [[Rec. 709|BT.709]], kelir RGB dipidangkeun ukur ku ajen 8-bit ti 16 tepi ka 235.  Jangkah nu kawates ieu dijieun keur mere lolongkrang pikeun ''[[undershoot]]'' jeung ''[[overshoot]]'', nu mangrupakeun sipat pasinyalan [[TV analog]]. Dina pasinyalan [[TV digital]] mah, undershoot jeung overshoot teh teu aya, lusabab kitu ajen ti 1-15 katut  235-254 bisa dipake keur midangkeun kelir nu sajati.  Pikeun ngajaga [[backward-compatibility|kacocogan ka tukang]] jeung standar samemehna, kelir standar beureum (red (R)), hejo (green (G)), bulao (blue (B)) jeung bodas (white) diitung keneh make susunan nu sarua dina rohangan kelir. Jangkah ajen digital nu leuwih rubak bisa mere lolongkrang keur midangkeun hejo kolot (''deeper greens''), beureum kolot (''deeper reds''), katut bulao kolot (''deeper blues'') - tur tangtuna oge kelir-kelir panengah nu samemehna aya dina saluareun wawates dina rohangan kelir [[CCIR 601]].
+{{tarjamahkeun|Inggris}}
 Even the [[high-definition television]] color space defined by BT.709 encompasses only 45 per cent of the possible values with RGB indices of 1 to 254, since those indices are limited to 16 to 234 by the BT spec.  The xvYCC standard uses 1 to 254, and can encode more than twice the number of color values.  (The [[sRGB]] system is in between the BT.709 and xvYCC systems, allowing use of all combinations of R, G and B values from 16 to 235 - more combinations, but not so many as in xvYCC.)