Hi Nithya,
I think noone answered this so far.
1.As evalglare software requires hdr images of 800x800 pixels, i tried
to get the pixel information using getinfo in DOS window from the
START button-> run->cmd. And while using pfilt command to divide x and
y by a number, it says pfilt is not recoznised as an internal or
external command. Is there another command to resize the image that
can be used with DOS window?
Pfilt is a program coming with Radiance (www.radiance-online.org). It
allows you to filter images in Radiance RGBE format, an HDR image format
storing a wide range of radiance (or, sometimes, irradiance) values
maintaining acceptable file sizes. However, it applies algorithms to the
file that go beyond scaling the image size. I would thus propose to use
pcomb instead, again, part of Radiance.
Both tools provide a command-line interface, no graphical user
interface. The syntax for pcomb to generate a 800 by 800 pixel version
of big.hdr would be
pcomb -x 800 -y 800 -o big.hdr > small.hdr
The -o will revert any exposure-adjustments that may have been applied
to your image before. small.hdr would be the image to be processed by
evalglare.
2. How shall i install the evalglare application? When i run evalglare
application by right clicking the setup file,a plain dos screen
appears.How shall i start with it?
Evalglare is just one program that should be located in a directory
included in your operating system's search path. No need for any kind of
"installer".
3. Will evalglare work well with hdr images other than fish-eye?
Yes. However, you need to know the vertical illuminance than, which can
be calculated from the pixel values in case that you have a 180 degrees
fisheye.
I guess you are working in some Windows environment. I have no
experience with this, so my answers are pretty generic. You will need to
know how to work on the command-line if you want to start using
evalglare and Radiance HDR tools. This is not specific to HDRI, but to
knowing your operating system. Many do not find Windows to be a very
comfortable environment for such applications, I would rather go with a
Linux or Mac OS installation, however it is not impossible.
Good luck, cheers, Lars.
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