QuickTime: What file types support transparency?

[Uli Kusterer]

Hi,

does anybody know for which image types QuickTime supports transparency,
when using QuickTime graphics importers to draw them?

I know GIF does, but I don't want to throw even more money down UniSys' throat.

For PNG and TIF it apparently doesn't work. I suppose it works for
object-oriented PICTs, but I need something that can easily be created
using Photoshop, GraphicConverter and the likes.

Any pointers would be greatly appreciated.

-- M. Uli Kusterer

(I do not wish to receive spam or unsolicited commercial e-mail)

[Rick Genter]

TGA format files allow for an alpha channel, which defines translucency.
Setting the alpha channel to 0 gets you transparency.

Rick

--
Rick Genter
Programmer
Operation Phoenix
<mailto:rickg...@spammenot.mediaone.net> (remove spammenot)
<http://people.ne.mediaone.net/rickgenter/>

On 9/15/01 7:52 PM, in article
witness_SPAMFREE...@p3e9d3089.dip.t-dialin.net, "Uli Kusterer"

[Tom Dowdy]

In article
<witness_SPAMFREE...@p3e9d3089.dip.t-dialin.net>,

witness_...@t-online.de (Uli Kusterer) wrote:
> For PNG and TIF it apparently doesn't work. I suppose it works for
> object-oriented PICTs, but I need something that can easily be created
> using Photoshop, GraphicConverter and the likes.

PNG and TIFF both support transparency (both as a file format, and
QuickTime's support of it).

[Uli Kusterer]

In article <B7CA41BA.13F05%rickg...@mediaone.net>, Rick Genter
<rickg...@mediaone.net> wrote:

> TGA format files allow for an alpha channel, which defines translucency.
> Setting the alpha channel to 0 gets you transparency.

Thanks, I'll have a look at that.

[Uli Kusterer]

In article <dowdy-946EE6....@news.apple.com>, Tom Dowdy
<do...@apple.com> wrote:

> PNG and TIFF both support transparency (both as a file format, and
> QuickTime's support of it).

Do I have to do anything special to make this work? A while ago I was able
to create a PNG that worked in Netscape Navigator (or was it iCab?) but
refused to be transparent in one of my programs (which worked fine for
GIFs).

[Michael Ash]

In article
<witness_SPAMFREE...@p3e990803.dip.t-dialin.net>,
witness_...@t-online.de (Uli Kusterer) wrote:

>Do I have to do anything special to make this work? A while ago I was able
>to create a PNG that worked in Netscape Navigator (or was it iCab?) but
>refused to be transparent in one of my programs (which worked fine for
>GIFs).

PNG is still a relatively new format, and as such many programs have
only partial implementations of it.

--
"From now on, we live in a world where man has walked on the moon.
And it's not a miracle, we just decided to go." -- Jim Lovell

Mike Ash - <http://www.mikeash.com/>, <mailto:ma...@mikeash.com>

[Uli Kusterer]

In article <mail-32129C.1...@news.charter.net>, Michael Ash
<ma...@mikeash.com> wrote:

> >to create a PNG that worked in Netscape Navigator (or was it iCab?) but
> >refused to be transparent in one of my programs (which worked fine for
> >GIFs).
>
> PNG is still a relatively new format, and as such many programs have
> only partial implementations of it.

Yeah, it's just that my program used Quicktime to display this image, and
that essentially means I can't display transparent files with QT, except
GIFs so far :-(

[Mike Fahl]

Uli Kusterer <witness_...@t-online.de> wrote:
>
> Yeah, it's just that my program used Quicktime to display this image, and
> that essentially means I can't display transparent files with QT, except
> GIFs so far :-(

I've done PNG with transparency (the alpha-channel kind - not ther key
color kind) through QT. The same goes for TIFF and PhotoShop.

Mike Fahl
----------------
WATCHOUT - digital multi-screen presentations.
http://www.dataton.com/