[Radiance-general] Images too bright with gendaylit

[Joe]

Thanks for your responses!
It works now as expected.

For future reference: I also found a good explanation here, page 9.
https://www.radiance-online.org/archived/radsite/radiance/refer/rc97tut.pdf/at_download/file

Does pcond -h something like automatically calculate the maximum 
luminance
and adjust the exposure? Or will it also apply the different perception 
of red, green and blue?

Is there a parameter for rvu to automatically set the exposure using the 
maximum Luminance
calculated?



Am 08.08.2017 17:03 schrieb Guglielmetti, Robert:
> Yes; exposure affects the appearance of the image but not the 
> underlying
> photo/radiometric values, or pixel data if you will. A Radiance image 
> is
> this amazing collection of spot meter data, basically. I’m not sure I
> understand your last statement there, about the “illumination [being]
> consistent”.
> 
> You can take a Radiance luminance image and run it through pcond to
> 'tonemap' the image and create all kinds of valuable effects. The 
> simplest
> is the '-h' option, which will map the pixel luminance according to 
> human
> vision capability. Thus, creating an image that conveys the appearance 
> of
> the scene as viewed by a human observer in that scene.
> 
> The main takeaway is that the raw Radiance images are physically 
> accurate,
> yet you are viewing them on dynamic range-limited devices, so they will 
> be
> hard-pressed to “look right”.
> 
> - Rob
> 
> 
> 
> On 8/8/17, 5:28 AM, "Joe" <solarjoe at posteo.org> wrote:
> 
>> 
>> From what I understand so far exposure only affects
>> the view of the rendered image, not the actual physical properties
>> like illuminance, radiance and irradiance.
>> And if rtrace is used to "view" the image instead of rvu the
>> illumination would be consistent.
>> 
>> Is that correct?
>> 
>> Kind regards,
>> Joe
> 
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