[Sidefx-houdini-list] display card requirements

herman lee herman02 at netvigator.com
Thu Mar 12 08:04:05 EDT 2015


Noted. Thanks craig.

-----Original Message-----
From: sidefx-houdini-list-bounces at sidefx.com [mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of Craig Hoffman
Sent: Thursday, 12 March, 2015 8:49 AM
To: sidefx-houdini-list at sidefx.com
Subject: Re: [Sidefx-houdini-list] display card requirements

I am thinking the white wash could be a gamma thing.  Some of those formats are linear, and not 2.2 gamma, so depending on what he did and how it was viewed it could come out looking washed out.

-Craig

-----Original Message-----
From: "Mark Elendt" <mark at sidefx.com>
Sent: ‎3/‎10/‎2015 6:35 AM
To: "sidefx-houdini-list at sidefx.com" <sidefx-houdini-list at sidefx.com>
Subject: Re: [Sidefx-houdini-list] display card requirements

JPEG is a lossy format.  It also has no Alpha plane.

You might be able to get around this by rendering an Alpha plane as a second JPEG image (using deep rasters, sending Af to a separate disk file).

My guess is that the white-wash in Photoshop is due to a mis-handling of the Alpha plane (which adjusts opacity).  Just a shot in the dark though.

On Tuesday Mar 10 at 21:22, herman lee wrote:
> Dear Mark,
> 
> The Mplay play properly on tiff image without the white wash. Now I 
> use the rop to render the image in jpeg format, since only the jpeg do 
> not appear to have white wash when I open it with photoshop. Then in 
> photoshop I save the image in tiff format for future printing.
> 
> I assume using the rop to render in jpeg then use photoshop to save in 
> tiff will not lose the quality right?
> 
> Many thanks!
> 
> Cheers
> herman
> 
> -----Original Message-----
> From: sidefx-houdini-list-bounces at sidefx.com
> [mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of Mark 
> Elendt
> Sent: Tuesday, 10 March, 2015 12:39 AM
> To: sidefx-houdini-list at sidefx.com
> Subject: Re: [Sidefx-houdini-list] display card requirements
> 
> Targa stores the image resolution in a 16 bit integer, so the maximum 
> resolution is 16384 by 16384.
> 
> TIFF stores its resolution in a 32 bit integer, so the max resolution 
> for TIFF is 4294967296 by 4294967296 (same as JPEG).
> 
> PNG and OpenEXR are 2147483647 by 2147483647.
> 
> If you save the image from a ROP and open it with mplay, does it 
> display properly?  Does it display properly if you load at 50% resolution (i.e.
> mplay scales the image as it loads, before it displays it).
> 
> The white-wash might be an artifact of the image display, rather than 
> an artifact in the image itself.
> 
> On Tuesday Mar 10 at 00:28, herman lee wrote:
> > Thanks Edward, I'm saving in tiff format. May be I should try targa. 
> > 
> > Cheers herman
> > 
> > -----Original Message-----
> > From: sidefx-houdini-list-bounces at sidefx.com
> > [mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of Edward 
> > Lam
> > Sent: Tuesday, 10 March, 2015 12:23 AM
> > To: sidefx-houdini-list at sidefx.com
> > Subject: Re: [Sidefx-houdini-list] display card requirements
> > 
> > The other thing that you might want to watch for are maximum 
> > resolution/size limits on the underlying image format that you're 
> > saving to. I think Photoshop should be able to handle file sizes that big.
> > 
> > -Edward
> > 
> > On 09/03/2015 12:06 PM, herman lee wrote:
> > > Thanks Edward, I did manage to save the image by using right 
> > > clicking at the node, for some reason when I use the rop output, 
> > > the image generated has a white wash on top.
> > > If I set the resolution to 25000x25000, somehow I manage to save 
> > > the image, but photoshop not able to open it, most likely its too 
> > > big of a
> > file.
> > >
> > > Cheers
> > > herman
> > >
> > > -----Original Message-----
> > > From: sidefx-houdini-list-bounces at sidefx.com
> > > [mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of 
> > > Edward Lam
> > > Sent: Monday, 9 March, 2015 11:02 AM
> > > To: sidefx-houdini-list at sidefx.com
> > > Subject: Re: [Sidefx-houdini-list] display card requirements
> > >
> > > Are you able to cook and write out those files using a Composite 
> > > ROP at that resolution? That would rule out whether it's display 
> > > limitation or
> > not.
> > >
> > > Best Regards,
> > > -Edward
> > >
> > > On Sun, March 8, 2015 11:51, herman lee wrote:
> > >> Hi all,
> > >>
> > >> My work mainly involved with compositing and need to generate 
> > >> high resolution images from cop. I set to maximum resolution at
> > >> preferences>compositing>cooking, say at 20000x20000, however, the 
> > >> preferences>compositing>image at
> > >> composite view can only display up to around 16000 pixel. Is it 
> > >> because of my display card capacity? Mine is NVIDIA Quadro K2000, 
> > >> should I get a higher performance display card? Any recommendation?
> > >> I'm using Houdini 14, window 8.
> > >>
> > >> Thanks!
> > >>
> > >> Kind regards
> > >>
> > >> Herman
> > >>
> > >>
> > >>
> > >> _______________________________________________
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> > >>
> > >
> > >
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> --
> Mark Elendt
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