Re: 16bit tiffs

[Alan Jones <skyphyr(at)gmail.com>]

The one I mentioned before at http://telegraphics.com.au/sw/ exports the alpha channel - if it's an alpha channel (i.e. it doesn't support the transparency on a layer, but if you make an alpha channel in your channel list that will work).

Cheers,

Alan.

On 2/2/06, Matt Lind <speye_21(at)hotmail.com> wrote:

Photoshop plugin doesn't support alpha channels in 16-bit SGI images either.
  that is, it doesn't export the alpha.

If you need an interactive solution, the FXTree works fine, but command line
tools are probably your best option if you need a quick conversion.
imf_copy supplied with mental ray, or imgconv supplied with XSI should do
the trick.  I'd lean towards imf_copy.


Matt

------------------------------
Matt Lind
Animator / Technical Director
SOFTIMAGE certified instructor:
   SOFTIMAGE|3D
   SOFTIMAGE|XSI
Matt(at)Mantom.net


Re: 16bit tiffs
Date : Wed, 1 Feb 2006 18:13:59 -0800
To : XSI(at)Softimage.COM
From : Gene Crucean <genecrucean(at)gmail.com
Subject : Re: 16bit tiffs

We're testing those too but the problem with sgi's is that they aren't
supported by PS without plugins. I have an sgi importer plugin on my system
but I guess it is buggy or has issues. I personally haven't done any testing
of that plugin other than open an sgi image.






On 2/1/06, Luc-Eric Rousseau <lucer(at)softimage.com> wrote:
why don't you use 16-bit SGI?  It's the most compatible format.
-----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM]On
Behalf Of Gene Crucean
Posted At: Wednesday, February 01, 2006 8:34 PM
Posted To: xsi
Conversation: 16bit tiffs
Subject: Re: 16bit tiffs


Haha, HEY it showed up! I sent this yesterday and it didn't get posted to
the list at all. Unless I'm not recieving my own posts until someone replies
to one of them. It seems like that's when they pop up.

Anyway, I called Soft today and they said it's a bug that's going to be
fixed in the next release. The workaround is what Luc-Eric said. Pipe it
through the FX Tree. Which imo sucks if you have lots of passes.

Btw, we've been using 8bit sgi's for a while but our flame guys want to step
things up to 16 then output at 10 from flame. File format is the biggest
issue at the moment. Once this gets fixed I think we'll be switching to
16bit tiffs.

Thanks for the input though guys.





On 2/1/06, Luc-Eric Rousseau <lucer(at)softimage.com> wrote:
no, that was the reverse question, loading tiff, this is about the
tiffs that are written.

16-bit tiff output is broken in Mental Ray.  Fixed build is not publically
available. Use .sgi files instead, or fix the tiffs by going through the
never-has-these-kinds-of-problems fxtree..

>-----Original Message----- From: Robert Moodie

>This was covered 2 weeks ago...
>
>
>
>----- Original Message -----
>From: Halfdan Ingvarsson
>
>TIFFs are most likely to trip you up. LZW compressed TIFFs will be
>automatically embedded (there's even a warning for it)
>because mental images
>still stubbornly refuse to support it, even after the patents
>have expired.
>They got a bit testy after Pixar forced them to drop monte-carlo sampling
>due to their patent on it. Shake and Photoshop write out
>TIFFs with LZW
>compression on by default.
>
>Any other image format not natively supported by mental ray will get
>embedded in the file.
>
>  - ½
>
>
>
>----- Original Message -----
>From: "Rui Feliciano" <ruifeliciano(at)isisds.com >
>To: <XSI(at)Softimage.COM>
>Sent: Wednesday, February 01, 2006 6:30 PM
>Subject: Re: 16bit tiffs
>
>
>Gene Crucean wrote:
>
> > Does anyone know how XSI encodes 16bit tiffs? Is it using LZW? If so
> > can we get an options button in the next release? Photoshop doesn't
> > seem to like xsi's tiff flavor and I'm willing to bet that they are >
>being compressed with jelly beans.



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