overview of hdr in an editing / conform environment of hdr in an editing / conform environment 2...
TRANSCRIPT
![Page 1: Overview of HDR in an editing / conform environment of HDR in an editing / conform environment 2 Confidential and Proprietary Information. Please do not copy, forward, redistribute,](https://reader031.vdocuments.pub/reader031/viewer/2022022805/5cac444188c993b30b8bd895/html5/thumbnails/1.jpg)
1 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
Luc Amiot
Senior Principal Product Designer
Tokyo, February 2016
Overview of HDR in an
editing / conform environment
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2 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
画質を上げる3つの方法
• より多くのピクセル: 4Kの普及 • より高いフレームレート • ピクセル単位のクオリティ
• ハイダイナミックレンジ • 広いガマット
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3 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
収録機におけるHigh Dynamic Range
フィルム
デジタル・シネマ・カメラ
• Arri
• Blackmagic
• Canon
• Panasonic
• Red
• Sony
スマートフォン
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4 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
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5 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
あまり明るくないディスプレイにおけるHDR視聴
BT.1886 (フラットパネル・ディスプレイのための
Transfer Function(伝達関数))
•白の輝度を100nitsに規定
• 03/2011
Note: シネマに対するDCI規格は
48 cd/m2
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6 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
SMPTE 2084 High Dynamic Range Transfer Function
カーブは、ルミナンスレンジ 0-10,000 nits (cd/m2)に規定
絶対輝度
一般的な蛍光灯と同じ明るさ
室内で視聴しても、明るいがまぶしくはない明るさ
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7 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
HDRカーブ
ST.2084(Dolby Vision, HDR10)
HLG (BBC / NHK)
Technicolor
ACES linear
ACEScc log
Sony Slog3
Arri logC
Canon Clog
Panasonic Vlog
0
200
400
600
800
1000
1200
0 500 1000 1500E
nco
ded
valu
e
% IRE
Camera Log 10 bits
Camera log White598
Camera Log 10 bits
10 bit integer limit
Camera log black95
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8 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2014.
CCD センサーは光をリニアにとらえる
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9 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
Logカーブはシーンの対数エンコーディング ストップで計測される露出と実際の信号の露出との関係は一定。 各ストップでの露出は信号の露出を一定量で増加させる。
Log Cカーブの形状は、フィルムネガの露出のカーブと類似した形状
なぜ Log が必要なのか?
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10 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
High exposure values
Hybrid Log Gamma ref. white = 0.5 1.0 = 12 times brighter than ref. white
SMPTE 2084 100 nits = 0.5 1.0 = 10,000 nits
SMPTE 2084 (zoomed 0-100 nits) SMPTE 2084 (full scale)
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11 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
HDR の要素
カラースペース (DCI-P3, Rec.2020)
参照元:
http://www.heavyoptical.com.hk/
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12 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
HDR の要素
カラースペース (DCI-P3, Rec.2020)
ビットデプス (10-12 bits)
ビットデプスが高ければカラーバンディングが出にくい
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13 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
HDR の要素
カラースペース (DCI-P3, Rec.2020)
ビットデプス (10-12 bits)
伝達特性 (S-Log3, PQ Curve)
transfer function
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14 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
HDR の要素
カラースペース (DCI-P3, Rec.2020)
ビットデプス (10-12 bits)
伝達特性 (S-Log3, PQ Curve)
ブラックポイント、ホワイトポイント
ダイナミックレンジ (IRE)
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15 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
ブラックポイント、ホワイトポイントの例
0
200
400
600
800
1000
1200
0 500 1000 1500
En
co
ded
valu
e
% IRE
Camera Log 10 bits
Camera log White598
Camera Log 10 bits
10 bit integer limit
Camera log black 95
0
200
400
600
800
1000
1200
0 500 1000 1500
En
co
ded
valu
e
% IRE
Rec 709/2020 10 bits
2020 Black Point
2020 White Point
2020 10 bits
Limit of 10 bit integerrepresentation
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16 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
HDR に必要なもの…
HDR メディアフォーマット
精度とレンジを保った処理
HDR 配信 メディア
フォーマット HDR カメラ
HDR ディスプレイ
• フィルム • Arri Alexa • Red • Panasonic
varicam 35 • Sony F55 • Canon C500
• DNxHR 10/12 bits • ProRes 10/12 bits • OpenEXR • RedRaw • Sony Raw • Panasonic Raw • Canon Raw • ….
• S2.14 log • 10.6 log • 12.4 log • 16 bit
Half Float linear • 32 bit
full float linear
• JPEG 2000 (DCI, IMF)
• QT Prores • HEVC
10/12 bits MP4 • DPX • OpenEXR
• Vizio TV • Dolby Pulsar • Christie Projectors • Sony HDR displays
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17 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
DNxHR 編集用中間フォーマット
シンプルなアルゴリズムの編集用コーデック
レンダリング トランスコード ミックスダウン プロキシ
ロスレス
プロキシから2K、4K、 それ以上の解像度までサポート
Profile
Level Name
HD (DNxHD) DNxHR
Pre
vio
us
na
min
g
Sca
n
Typ
e
Bit d
ep
th
Chro
ma
su
b-
sa
mp
ling
Mbps
1080
59.94p
Sca
n
Typ
e
Bit d
ep
th
Chro
ma
su
b-
sa
mp
ling
Mbps
UHD-1
50p
444 4:4:4 DNxHD 444
MXF P 10 RGB 880
P 12 RGB/
4:4:4 3498
HQX
High
Quality,
extended
DNxHD
220x MXF P/I 10 4:2:2 440
P 12 4:2:2 1748
HQ High
Quality
DNxHD 220
MXF P/I 8 4:2:2 440
P 8 4:2:2 1748
SQ Standard
Quality
DNxHD 145
MXF P/I 8 4:2:2 291
P 8 4:2:2 1156
TR Thin
Raster
DNxHD 100
MXF P/I 8 4:2:2 -
LB Low
Bandwidth
DNxHD
36 MXF P 8 4:2:2 90 P 8 4:2:2 360
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18 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
DNxHR 編集用中間フォーマット
• Properties
• あらゆる解像度 • あらゆるフレームレート • あらゆるカラーモデル • あらゆる gamma/log • 8 bit, 10 bits, 12 bits • HDR 対応 • Alpha サポート (coming soon) • プラットフォームの制限なし • Wrapperの制限なし • SMPTE VC-3標準に準拠
Profile
Level Name
HD (DNxHD) DNxHR
Pre
vio
us
na
min
g
Sca
n
Typ
e
Bit d
ep
th
Chro
ma
su
b-
sa
mp
ling
Mbps
1080
59.94p
Sca
n
Typ
e
Bit d
ep
th
Chro
ma
su
b-
sa
mp
ling
Mbps
UHD-1
50p
444 4:4:4 DNxHD 444
MXF P 10 RGB 880
P 12 RGB/
4:4:4 3498
HQX
High
Quality,
extended
DNxHD
220x MXF P/I 10 4:2:2 440
P 12 4:2:2 1748
HQ High
Quality
DNxHD 220
MXF P/I 8 4:2:2 440
P 8 4:2:2 1748
SQ Standard
Quality
DNxHD 145
MXF P/I 8 4:2:2 291
P 8 4:2:2 1156
TR Thin
Raster
DNxHD 100
MXF P/I 8 4:2:2 -
LB Low
Bandwidth
DNxHD
36 MXF P 8 4:2:2 90 P 8 4:2:2 360
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19 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
値の解釈 – カラーフォーマット
カラースペース
ビットデプス
ダイナミックレンジ
伝達関数
黒とノミナルピーク
1023 = 1.1 = 109%, 800, 1300% IRE
64 = 0.0 = 0% IRE
940 = 1.0 = 100% IRE
0 = -0.1 - -10% IRE
Full Range Video Levels
High exposure values / Over-shoots
Under-shoots
color space
bit-depth
dynamic range
transfer function
black and nominal peak
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20 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
Avid のビットデプスとレベルの扱い
内部処理はノーマライズの形で処理 • mix and match
内部処理フォーマット
• 内部イメージバッファ - 8 bit video levels - 16 bit (signed 2.14 format)
• イメージ処理コード - 8, 16整数処理に最適化 - 32 bit フローティングポイント - スーパーホワイト/ブラックの値を維持
16 bit 処理はエフェクト処理の 設定によって起動
16384 = 1.0 = 100% IRE
219 = 0.0 = 0% IRE
0 = -2.0 = -200% IRE
14 bits of precision
65535 = 2.0 = 200% IRE
255 = 1.09 = 109% IRE
235 = 1.0 = 100% IRE
16 = 0.0 = 0% IRE
0 = -0.07 = -7% IRE
220 levels of precision
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21 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
High Quality - Avid 16 bit 処理
65535 = 2.0 = 200% IRE
16384 = 1.0 = 100% IRE
219 = 0.0 = 0% IRE
0 = -2.0 = -200% IRE
14 bits of
precision 12
bits
Signed 2.14 Format
10
bits
8
bits 12
bits
10
bits
8
bits
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22 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
S2.14
黒色/白色点の間を 14 bit精度で処理
ダイナミックレンジを±100%範囲外へ拡張(HDRに適用)
高速な整数処理
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23 Confidential and Proprietary Information. Please do not copy, forward, redistribute, or publish. Avid ©2016.
Avid プロセッシングモデル
プロジェクトのカラースペース設定は ノーマライズ時のリファレンスとして使用される
最大 16 bit プロセッシングパイプライン
最大 12 bits (new) I/O モニタリングパイプライン
最大 12 bit DNxHR エフェクト・プリコンピュート
ソース カラー スペース
プロジェクトカラー スペース
自動変換
アウトプット カラー スペース
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ソースカラー設定
ソース カラー スペース
プロジェクト
カラー スペース
自動変換 ルック
• 自動処理は 無効化できます • ソース設定 ダイアログ
• カラー設定 ダイアログ
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オートマチック・カラー・トランスフォーム
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オートマチック・カラー・トランスフォーム
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Rec709 の白は 100 nits にマッピング
Rec709 メディアを SMPTE 2084 にマッピング
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モニタリングの柔軟性
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モニタリングの柔軟性
DNxIOからの出力
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カラープロセッシングの例
storage
GPU 処理 CPU 処理 デスクトップディスプレイ
SDI/HDMI モニタリング
デコード
カラー アダプター/ソース設
定
プラグイン FX
カラー コレクション
エンコード
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シンプルなワークフロー
Baselight
プラグイン
• HDR プロジェクトタイプ
• HDR メディアへリンク
• Rec. 709メディアはソース設定に従ってHDRへ変換
• 表示と出力用のLUT
DNxIO
HDR
モニター
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