本帖最后由 medion 于 2019-1-4 05:56 编辑
Color Space conversion from DCI/P3 to Rec. 2020Most of existing motion picture film content is produced in the DCI-P3 format, the most commonly used color space for Digital Movie Projection. However, encoding this content in Ultra HD Blu-ray format using HEVC and displaying on a HDR10 compatible media device requires conversion to Rec. 2020 color space.
This can be accomplished through a DCI/P3 to Rec 2020 color space converter. A graphical representation of such a converter with non-constant Luminance Y’Cb’Cr’ output is shown in Figure 2 below. The EOTF function maps the RGB signals from the electrical domain (non-linear) into the optical domain (linear space) and the OETF does the inverse. The EOTF, OETF and the R’G’B’ to Y’U’V’ conversion matrix are all specified in BT.2020. The challenges involved in implementing an optimized version of such a compute intensive converter are: - Fast Matrix multiplications for the color conversion and YUV conversion blocks typically in fixed point arithmetic.
- Non-linear floating point operations in the form of exponents and logarithms for the OETF and EOTF blocks. Floating point operations of this nature are computationally very expensive and require acceleration using fixed point lookup tables.
- The complexity of fixed point implementations require a large number of bits to maintain high precision. This is especially applicable in a linear space where the dynamic range is very high.
着重关注“encoding this content in Ultra HD Blu-ray format using HEVC and displaying on a HDR10 compatible media device requires conversion to Rec. 2020 color space.”这段话！
综上所述，也就是说~在播放HDR影片的时候，在兼容HDR设备上，是优先使用Rec.2020色域，即时是以DCI P3来拍的源片~为了满足HDR EOTF 2084，也须转成Rec.2020！所以~根本不存在Rec2020转DCIP3，只有相反的情况！
这样看~DCI P3其实已经和NTSC色域的境况类似了，比NTSC短命得多！境地非常尴尬，SDR需要的709,HDR需要的是2020···这个东西就是来充一下显示设备能到多广色域门面的
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狗仔卡
发表于 2019-1-4 04:18
你忘记了截红字了，设备是什么我说了，拍摄参数ISO 是多少，快门式多少， EV是多少我也说了！居然看不懂？就你这破水平还在上面贴教别人摄影问题？小学没毕业就来教大学生，你滑天下之大稽！你这样秀只会把你的智商越秀越低的~哈哈哈哈！我第一句话只是用来嘲讽你的低智商的~
这张图是SDR视频版的有疑问？你被打脸打傻了是么？为什么是SDR的？因为这个视频的SDR和HDR右上角的水印，看清楚没？
看看~右上角天大一个4KHDR，你眼瞎还是脑子坏了？
