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Re: [Openexr-devel] OpenEXR geometry...
From: |
Florian Kainz |
Subject: |
Re: [Openexr-devel] OpenEXR geometry... |
Date: |
Tue, 15 Jul 2003 19:08:04 -0700 |
Bruno Ripa wrote:
>
> Hi, another little question about OpenEXR..... :)
>
> it seems to me that a HDR image can be mapped without any problem on a
> sphere, while i read in OpenEXR docs that pixel coords are relative to a
> rectangular geometry (a plane :) ).
>
> Let's talk for difference with HDR.
>
> So, let's suppose i've got a probe image in hdr format, i can use it on a
> sphere and so on....
>
> And with a openexr image which's the way ?
> Can i map it on a sphere ? I suppose to get a little perturbation of my
> datas because (as sad before) i will use points of a plane and project them
> on a sphere.....
>
> So what kink of result will i have and how good will be the representation
> of the image (and the data it represents) ?
>
Hi Bruno,
you can, of course, map an OpenEXR image onto a sphere.
I don't see any reasons why some of the common image
file formats would be better or worse than others for
this kind of operation.
Almost all image file formats that I know of store planar,
rectangular pixel grids; mapping the pixel grid onto a
sphere involves warping and resampling the image. There
may be image file formats that directly support spherical
images, but I have never heard of any.
Does this help, or did I completely misunderstand your
question?
Florian