[Radiance-general] Tone mapping for animation

[Greg Ward]

Indeed.  The usual way of getting a label into an image is using pcompos, which strips the image of exposure information that pcond needs to do its job.  Since the output of pcond in most cases has lost its useful luminance information, it works well to apply the label at that point and/or convert to some non-HDR image type via ra_whatever.

Cheers,
-Greg

> From: David Geisler-Moroder <david.moroder at gmail.com>
> Date: October 22, 2013 9:45:12 AM PDT
> 
> Perfect, thanks for the clarification Greg!
> 
> Another short note: 
> I just found out that one thing that also made my life hard with getting the scene constantly exposed was the inclusion of a time stamp in the image with psign before sending the image through pcond... stupid error on my side as this introduces virtual luminances that are not in the scene. 
> 
> 
> 2013/10/22 Greg Ward <gregoryjward at gmail.com>
> I don't use hdr2jpeg myself, and it isn't distributed with Radiance.  Depending on which version you have, it applies either a Reinhard TMO or a variant of the histogram adjustment operator in pcond, but there's no way to tell it to use a specific curve as you can with the pcond -I option Jack mentioned.  The latter technique with phisto is what I generally use if I want a sequence exposed the same.  And, you can go on using the same histogram for future frames so long as they don't change too much from the range of past frames.
> 
> Cheers,
> -Greg
> 
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