[Radiance-general] Merge hdr-images

[Thomas Bleicher]

Hi Anselm.

I don't know if Relux produces plain Radiance RGBE HDR images. If so
you can modify them using the tools provided in the Radiance
distribution. You will have the command line, though.

To mix two (or more) images you can use the program pcomb. You can
specify a multiplier for each image. For example, to mix
"downlight.hdr" with 60% and "wallwash.hdr" at 40% you would use the
command:

pcomb -s 0.6 downlight.hdr -s 0.4 wallwash.hdr > room_6_4.hdr

Using HDR images as input will give you the 'correct' amount of light
in a space. However, if you are only interested in a 'visual' fade
between the two you can simply convert the two images to a 32bit TIF
or BMP image and use the controls you know from Photoshop. I would
think Relux has tools to do that. If not this is the equivalent
Radiance command line:

ra_tiff images.hdr image.tif


Regards,
Thomas




On Thu, Mar 18, 2010 at 10:09 AM, Anselm von Held
<anselm.von-held at arup.com> wrote:
> Dear users,
>
>
>
> I produced a couple of hdr images, each from a different light source (using
> the radiance module of Relux). I am looking for a way to merge them and to
> be able to adjust their intensity. I tried to load them into Photoshop, but
> I am not sure how to overlay (lighten?) them, and the Photoshop layers are
> not working.
>
>
>
> Are there programs where I can easily do that (The one I know  is Vivaldi
> from Zumtobel – is that any good?)? If I can do this in Photoshop, how can I
> put the images onto different layers to be able to mix them? How can I
> produce a little animation of fading in and out of two images?
>
>
>
> Thanks for your help
>
>
>
> Anselm
>
>
>
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