HowTo? Use S-Log2 PP7 to emulate RAW ETTR for stills at ISO 100? Possible? Flawed?

Started Sep 1, 2015 | Questions thread
l_d_allan
OP l_d_allan Veteran Member • Posts: 5,087
Gave up on s-log2. Getting closer to ETTR using UniWb + PicStyle + zebra 100+

The Sony and RawDigger newbie gave up on using s-log2 to facilitate ETTR. Here's what seems to work better. YMMV:

  • UniWB (using spread-sheet approach described by Jim Kasson ... Thx! )
  • Picture Style Neutral, Contrast= -3, Saturation = -3
  • Zebras 100+
  • ...
  • Intent is to compensate for JPEG pipeline processing that throws off histogram/blinkies/etc.
  • "Canon defector" spoiled by MagicLantern Auto-ETTR and RAW blinkies/histograms
  • ...
  • Back off 1 click (1/3 EV) when zebras just show up in non-spectral highlights
  • Check with RawDigger on .ARW's and then .DNG's from DngConverter
  • Almost invariably getting within 1/2 stop of "true max ETTR" of 15871 DNG value
  • Typically getting 13,000+ of highest RGBG channel (probably within 1/5 stop of "true max ETTR")
  • Worst case almost invariably leaves two channels of unblown values for ACR/LR to recover.
  • Most blown pixels were 0.1% or less in two channels, leaving two channels not-blown.
  • Tests ranged from ISO 100 in sunlight to 30 sec ISO 640 f2 with Sony FE 28mm f2 and Canon EF 70-200mm f2.8L IS II.
  • ...
  • Flawed? Suggestions appreciated.
 l_d_allan's gear list:l_d_allan's gear list
Panasonic Lumix DMC-TZ3 Panasonic Lumix DMC-FZ47 Canon PowerShot S110 Canon EOS 5D Mark II Canon EOS 600D +27 more
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