[Radiance-general] Images too bright with gendaylit

[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