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發表於 2013-11-9 16:06:09
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本文章最後由 crabarts 於 2013-11-9 16:09 編輯
感謝真平大點醒, 之前我真的是不夠了解 X70, 下面是這2天重新調教的結果Delta E 30~90IRE 2以內, 20IRE 3, 其他就比較差
Luminance, perfect
Gamma 2.22 平坦
RGB 30~90IRE 全都貼在100%上 (100% 整個歪,後面再解釋)
色溫30~90IRE 6500k (100% 整個歪,後面再解釋)
CIE圖, 藍色不再被犧牲
上面 100% 整個大失衡的原因, 起因就是之前藍色一直偏紫去 AVS forum 詢問, 根據avsforum網友回覆給我的內容來看, 這問題JVC自己要負很大的責任. 據他們向日本原廠求證, RGB主要顏色與白平衡連結, 所以只要動到白平衡設定(RGB gain), 就會影響到主顏色. 原文如下
Unfortunately the Oceanic, Japan, EU, X50,X70,X90 models have an internal design that has the primary colours directly connected to the white balance controls. Consequently any adjustment of the white balance shifts the primary colour away from the direction of the cuts and gains. In this case you will typically cut the blue and green gains to obtain D65, this shifts blue and green towards red colapsing the gamut. Blue becomes noticably purple and green becomes yellow green.
It doesn't matter if you use a pre select mode such as D5500 as this mode still colapses the gamut the same as manual adjustment.
JVC Japan engineers recommended to me that I just avoid adjustment of the white balance. The design is such that it cannot be addressed with a firmware change.
事實還真的是如此, 還不需任何調整只要 preset 設定低於 6500k, 藍色就一定色偏, 偏洋紅變成紫色. 白平衡基本上不能動. 但是 X70 內的 gamma 設定太強大了, 所以我就把白平衡 preset 6500k 只能調 RGB offset, (preset 下 RGB gain 鎖死). 依據 30IRE 調整了一下 offset, 就進去gamma裏面一段一段慢慢調, 結果相當完美30~90IRE delta E 都在2以下, gamma 2.22, 但是也就是因為 RGB gain 不能動, 所以 100IRE 完全不能調導致述職完全偏差, 表現良好的範圍只存在 20IRE~90IRE. 色域我是選用 cinema1 color profile, X70的廣色域濾鏡, 就維持目前狀況.
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狗仔卡
發表於 2013-11-17 01:23:34
