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Further work on my Urbex scene and HDR compositing as post-process. I am
using for this four images of the same scene in which the light
intensity is multiplied respectively by 2, 10, 50, 250. This nicely
simulates the under- and over-exposure settings used in traditional
photography.
The floor of the staircase is too shiny for my taste, and there are a
couple of other issues I need to address, but I like the result.
Thomas
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Am 23.06.2014 10:18, schrieb Thomas de Groot:
> Further work on my Urbex scene and HDR compositing as post-process. I am
> using for this four images of the same scene in which the light
> intensity is multiplied respectively by 2, 10, 50, 250. This nicely
> simulates the under- and over-exposure settings used in traditional
> photography.
What I don't understand in your workflow is why you're apparently
rendering the scene multiple times? Why on earth don't you just use
OpenEXR output, use some post-processing tool to apply nonlinear
tonemapping, and be done with it?
One tool that might meet your needs would be Ive's fantastic IC image
converter (it can also do luminous bloom if you feel like it); for
scripted operation ImageMagick can probably also be coaxed to do the job
- or you might even throw together some smart POV-Ray script using
pigment functions and function pigments.
At any rate, there's absolutely no need to re-render a scene four times
just with different light intensity. Even if you absolutely need four
low dynamic range images with different light intensities, you can still
just render a single high dynamic range image, and apply linear
tonemapping as a post-processing step to generate four different output
images.
(You might even be able to get your desired results simply by misusing
POV-Ray's File_Gamma setting, and writing to a file format other than
PNG. Not strictly recommended, but might work.)
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I stand corrected and thanks for that Christoph. So simple indeed. Exr
image through IC (increased Exponent in tonemapping and saving in RGB 8
bps to make the image less heavy).
The stupid thing is that I /had/ thought about using IC, only I forgot
about exr. How stupid can you get, huh? ;-)
[shambles away with drooling mouth]
Thomas
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