[Radiance-general] Raw images from radiance package?

[Greg Ward]

Matlab does have a module for reading HDR images.  See:

	http://www.mathworks.com/help/images/working-with-high-dynamic-range-images.html

You can also convert to other formats as I said using pvalue, or go directly to floats using rtrace.  For example:

	vwrays -vf myview.vf -x 100 -y 100 | rtrace -h scene.oct > myresults.txt

would create an ASCII list of RGB values, one per pixel for the given view.

Best,
-Greg

> From: Vera Liu <lizzielyh at gmail.com>
> Subject: Re: [Radiance-general] Raw images from radiance package?
> Date: March 20, 2014 12:11:00 PM PDT
> 
> Hi Greg,
> Thank you so much for the prompt reply! I want to generate some simulation images for my project, but Matlab can't read in the .oct file or .pic file generated by oconv and rpict. So I was wondering what I should use to output raw images with linear light coordinates and then extract the pixel values. As you mentioned  the gile generated by using rpict should be the raw format? Or I could use rtrace option to get the pixel values?
> 
> Best,
> Vera
> 
> 
> On Thu, Mar 20, 2014 at 10:40 AM, Greg Ward <gregoryjward at gmail.com> wrote:
> Of course.  Radiance pictures as output from rpict, etc. are linear floating-point in RGBE format.  You can change these to ASCII or binary floats using the pvalue program.  If you don't like the 1% precision this gives you, there is the option of outputting to 4-byte IEEE float or ASCII from rtrace.  You can couple this with vwrays if you want to generate specific views.
> 
> What is your purpose?
> 
> -Greg
> 
>> From: Vera Liu <lizzielyh at gmail.com>
>> Subject: [Radiance-general] Raw images from radiance package?
>> Date: March 19, 2014 10:45:42 PM PDT
>> 
>> Hi,
>> I know there are functions like ra_bmp to transfer radiance files to bmp files or other formats. I'm wondering if there's a way to generate raw images from the .rad files so that the output is in linear light coordinates?
>> Best, 
>> Vera
> 
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