Simon M Hart (simon.hart++at++nottingham.ac.uk)
Mon, 01 Jun 1998 15:07:30 +0100
I'm still struggling here, despite alot of help from the performer
group.
One problem is that I do not have a graded alpha channel rgba to compare
my results with.
Attached are three images:
1: a gradient in rgb (256x256 pixels)
2. a head in rgb (256x256 pixels)
3. a screen snap of my efforts, using Gimp and Medit.
If you can spare the time, could you use your tools to
1:combine the gradient with the head image
2.take a screen snap of the graded alpha channel texture in use in
realtime 3d
3.email back to me the screen snap and the .rgba
Thanks
Simon
Simon M Hart wrote:
> Performers
>
> A simple problem in some ways:
>
> [imagefile].rgb + [greyscaleimagefile].rgb = [composite
imagefile].rgba
>
> That is to say I want to use a greyscale image
> as the graded alpha channel for an rgba image,
> for instance for putting a graded tint on a car
> window.
>
> Does any one know of an application that is
> readily available to combine two such images to
> create an rgba file with graded alpha channel?
>
> Thanks
>
> Simon.
>
> --
> Simon Hart, BA DipArch.
> Development Manager
> CIMI
> Unit 8 William Lee Buildings
> Highfields Science Park
> University Boulevard
> Nottingham NG7 2RQ.
>
> e-mail: simon.hart++at++nottingham.ac.uk
>
> Tel: 0115 956 8997/0 Fax: 0115 956 8991
>
> Internet: http://www.cimi.nott.ac.uk/
>
>
ADOBE Photoshop for SGI is able to do such image
processing - we use it to create alpha channels.
Note: Photoshop for other platforms than SGI
doesn't know the SGI rgba image format!
Regards
Hilko
--
****************************************************************
Hilko Hoffmann
Remote Sensing Laboratories; University of Zurich
Winterthurerstrasse 190; CH-8057 Zurich; Switzerland
Phone: +41 - 1 / 63 56519; FAX: +41 - 1 / 63 56842
mailto:hilko++at++geo.unizh.ch
http://www.geo.unizh.ch/rsl1/lvg/research/
****************************************************************
Hilko (or any one else)
I'm still struggling here, despite alot of help from the performer group.
One problem is that I do not have a graded alpha channel rgba to compare my results with.
Attached are three images:
1: a gradient in rgb (256x256 pixels)
2. a head in rgb (256x256 pixels)
3. a screen snap of my efforts, using Gimp and Medit.
If you can spare the time, could you use your tools to
1:combine the gradient with the head image
2.take a screen snap of the graded alpha channel texture in use in
realtime 3d
3.email back to me the screen snap and the .rgba
Thanks
Simon
Simon M Hart wrote:
> Performers
>
> A simple problem in some ways:
>
> [imagefile].rgb + [greyscaleimagefile].rgb = [composite
imagefile].rgba
>
> That is to say I want to use a greyscale image
> as the graded alpha channel for an rgba image,
> for instance for putting a graded tint on a car
> window.
>
> Does any one know of an application that is
> readily available to combine two such images to
> create an rgba file with graded alpha channel?
>
> Thanks
>
> Simon.
>
> --
> Simon Hart, BA DipArch.
> Development Manager
> CIMI
> Unit 8 William Lee Buildings
> Highfields Science Park
> University Boulevard
> Nottingham NG7 2RQ.
>
> e-mail: simon.hart++at++nottingham.ac.uk
>
> Tel: 0115 956 8997/0 Fax: 0115 956 8991
>
> Internet: http://www.cimi.nott.ac.uk/
>
>
ADOBE Photoshop for SGI is able to do such image
processing - we use it to create alpha channels.
Note: Photoshop for other platforms than SGI
doesn't know the SGI rgba image format!
Regards
Hilko
--
****************************************************************
Hilko Hoffmann
Remote Sensing Laboratories; University of
Zurich
Winterthurerstrasse 190; CH-8057 Zurich; Switzerland
Phone: +41 - 1 / 63 56519; FAX: +41 - 1 / 63 56842
mailto:hilko++at++geo.unizh.ch
http://www.geo.unizh.ch/rsl1/lvg/research/
****************************************************************
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