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Ok so I keep on reading on how nice OpenEXr is, but I really don;t get all the fuss, I would like to know wga tare the advatages of EXR over .Hdr and if you don't mind sharing how some of you use it.

see

http://www.openexr.com/index.html

tikal26 wrote:Ok so I keep on reading on how nice OpenEXr is, but I really don;t get all the fuss, I would like to know wga tare the advatages of EXR over .Hdr and if you don't mind sharing how some of you use it.

it's a very flexible and HDR capable open source multi-channel, multi-layer file format developed and used by ILM.

that is what I am having a proble graspping, I don't understand he way they use the term layer, i thought hey were using it as channels. So wha tis the difference between layera and channel?

Same difference

My opinion is it's more of a naming convention and way of working, where compositing programs extract info from extra channels present in the image, as opposed to extracting it from layers.

Yeah, when people say layers I think of things being stacked on top of each other. Here they are separate channels all held in one file.

OpenEXR is pretty cool really. It has a few different 'modes' and compression settings so that you can save space but still maintain the dynamic range. Also, basically anything can be a channel. So you could render out from Maya say channels for R, G, B, Alpha, Depth, Motion Vectors, reflections, everything that wobbles , etc etc and store it all in one file.

Jozvex wrote:Yeah, when people say layers I think of things being stacked on top of each other. Here they are separate channels all held in one file.

OpenEXR is pretty cool really. It has a few different 'modes' and compression settings so that you can save space but still maintain the dynamic range. Also, basically anything can be a channel. So you could render out from Maya say channels for R, G, B, Alpha, Depth, Motion Vectors, reflections, everything that wobbles , etc etc and store it all in one file.

yep! there's a very nice new implementation for LW here:

http://www.db-w.com/index.php

have a look at 'exrtrader'.

markus

ok I just finished reading some of the doc on the website and not it make ssence so now I guess we wait and se if they will implement this on Maxwell

An important point is the weight of the .exr files.
Much smaller than the hdr's.

uh ? it has already been told ?
yes , that's right.