Seems if I use any negative value, it returns a corrected png file. 0 leaves it where it is & positive values blow the picture out.
Pngcrush -replace_gamma -1 png_alpha_test.1.png pngcrushoutput.png
Will give a corrected png.
It won't overright the input file which is a shame, but it seems like a feasible fix.
Thanks for the tip Joe,
Adam.
> -----Original Message-----
> From: owner-xsi(at)Softimage.COM
> [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Adam Seeley
> Sent: 08 November 2007 18:33
> To: XSI(at)Softimage.COM
> Subject: RE: Rendering - png files.
>
> Hi,
>
> Having a look at png crush, seems like it could do the job.
> Not quite sure what gamma level I should replace to get it to
> look correct though as it already looks correct when loaded
> into photoshop or the fxtree, which is the look I ultimately want.
>
> A.
>
> > -----Original Message-----
> > From: owner-xsi(at)Softimage.COM
> > [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Joe Laffey
> > Sent: 08 November 2007 17:38
> > To: XSI(at)Softimage.COM
> > Subject: Re: Rendering - png files.
> >
> > On Thu, 8 Nov 2007, Adam Seeley wrote:
> >
> > > Hi peeps,
> > >
> > > Quick question.
> > >
> > > We're rendering a lot of elements out in .png format for
> > web content.
> > > When I open a rendered image in the windows viewer or
> > quicktime, the colour looks washed out.
> > > When I open it in Photoshop or the XSI fxtree, the colours
> > look fine.
> > > When I re-save the image back out of Photoshop as a .png
> > the file now looks ok in the windows viewer or quicktime.
> > >
> > > Is there a colour profile setting that should be controlled
> > when the png is written? or something like that?
> > >
> > > Here's an example image, the jpeg shows the proper colour
> > of the ball.
> > >
> > > Anyone seen this before?
> >
> >
> > PNG format can store gamma information. Some programs
> interpet this.
> > Some do not. You might try using something like pngcrush
> (google), a
> > command line util that can replace or remove the gamma value.
> >
> > --
> > Joe Laffey | Visual Effects for Film and Video
> > LAFFEY Computer Imaging |
> -------------------------------------
> > St. Louis, MO | Show Reel http://LAFFEY.tv/?e07702
> > USA |
> -------------------------------------
> > . | -*- Digital Fusion Plugins -*-
> > --------------------------------------------------------------
> > ------------
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.503 / Virus Database: 269.15.24/1117 - Release Date: 07/11/2007 22:52
---
Unsubscribe? Mail Majordomo(at)Softimage.COM with the following text in body:
unsubscribe xsi
