Thanks for explaining, Matt. I'm also a new Scarlet user, and I was pretty sure that was what RedLog was, but it's nice to see it explained in such basic terms.
Log is a gamma curve, it's not linear. I believe Redgamma 2 or 3 are meant to look decent within Rec.709 gamma while still containing most of the dynamic range of the original, whereas RedLog is an even flatter gamma designed to mimic a scan of color negative film -- on a Rec.709 monitor it will have lifted blacks, pastel colors, and dull, dim whites. It's not designed for viewing but for color-correcting in a D.I. system designed around 10-bit Cineon Log film scans.
Can someone explain me why changing ISO settings to lower or higher values moves the mid grey point down or up? It shouldn't change what physically hits the sensor as I understand, so is it some post algorithm behaviour or am I thinking completely wrong here? Also, why is ISO 800 said to preserve most dynamic range? I thought that a well exposed histogram should give the best dynamic range, no matter what ISO?
After reading the whole (great) thread those are the things I still struggle to understand.
When you're setting ISO with RED cameras, you're choosing where in the camera's dynamic range you're placing middle grey. And yes, a well exposed histogram (well, depending on camera settings and viewing mode) will give you the best dynamic range. ISO doesn't affect total latitude, it affects how much latitude you have above mid grey and how much you have below it.
If I use a light meter and set the ISO to 320 and the Scarlet to 800, then what do I set the light meter to if Scarlet is set to 320?
Or should the light meter always stay on 320 as it's only metadata? Any suggestions for operators using light meters?
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