[Radiance-general] Merge hdr-images

[Claus B. Madsen]

Hi

A possibilty for easy addition and other operations on hdr images is  
HDRShop ... Downloadable in a free 1.0 version from www.hdrshop.com

Best
Claus


Sent from my iPod

On 18/03/2010, at 12.07, Thomas Bleicher <tbleicher at googlemail.com>  
wrote:

> 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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