Tone-Mapping images in Shake from REDCODE output

[Wade McDonald]

I used a little ditty (and a layerX operation) to create the luminance channel.

I weighted the R, G, and B channels like so:

lum = 0.299r + 0.587g + 0.114b

It gives almost exactly the same result. (I may tweak in a bit)

Here it is, the node, documentation, etc.... no ShakeSDK needed!!

Enjoy!

-W

[Trevor Meier]

Thanks for posting this, Wade.

[Cail Young]

Very nice! What is the advantage of LumToAlpha vs a Colorspace-Reorder ?

[Wade McDonald]

Very nice! What is the advantage of LumToAlpha vs a Colorspace-Reorder ?

I wish I understood the difference, but the Apple .cpp code for that LumToAlpha stuff was at least 10x what my code for the whole Tonemap node was....haha.

Best I can tell, one is voodoo, one is hoodoo. :D

However, I think the weighted-colorspace approach is fine, because it's what was used by the guys who wrote the algorythm in the first place.

W

[Gavin Greenwalt]

What's the difference between this and just adjusting Highlight/Midtone/Shadow gamma independently?

[GlennChan]

It's spatial or area-based. Vaguely like automating crazy power windows, if you're familiar with power windows.

Or to explain it differently, it works on blurred areas, as opposed to a single pixel.

[Graeme Nattress]

Similar to "highlight / shadow" in Photoshop??

[Bruce Allen]

Or "highlight / shadow" in After Effects... look that one up, it even has temporal smoothing.

Also, the old wide-radius Unsharp Mask trick works for me...

Bruce Allen
director / designer
www.boacinema.com

[Columbus]

Photoshop CS3 has Highlight Recovery and Shadow Fill function that work non destructively in Camera Raw maybe this will also be a function in Redcine which would be pretty amazing.

[Gavin Greenwalt]

I would be very afraid of flicker from a plugin like that.