Re: graded alpha channel

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Daniel Stipe (danstipe++at++cts.com)
Fri, 29 May 1998 07:10:39 -0800

>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!
>

There is a plug-in which we use on the Mac to read SGI rgb. I'm not sure
it handles the RGBA format, but I'll try to check.

>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/
>****************************************************************

Regards,

Dan

----------------------------------------------------------
Dan Stipe (619) 578-8914 ph/fax
President e:mail danstipe++at++cts.com
VERTx Inc. PO Box 910135, San Diego, CA 92191
----------------------------------------------------------

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