Antialiasing with alpha channel

On Wed, 2 May 2007 15:39:42 +0200, "Tomasz J" <nospam@nospam.nospam> found
these unused words floating about:

>Hello,
>
>Could someone advice how to create a PNG image, with transparent background
>and anti-aliasing in alpha channel only? I mean, an image with edges nicely
>blending with any background.
>
>Is it possible with Photoshop at all?
>
>Thank you for any pointers,
>
>Tomasz J
>
The query should be:
>Is it possible at all?

No.

To blend you must have the item to be blended with.

The 'effect' can be achieved with sharp edges, but not 'blending'.

In article <vr7h33tldet9mf609r6bif4t1dg57habbd@4ax.com>,
Sir F. A. Rien <jaSPAMc@gbr.online.com> wrote:

> The query should be:
> >Is it possible at all?
>
> No.
>
> To blend you must have the item to be blended with.
>
> The 'effect' can be achieved with sharp edges, but not 'blending'.

False.

A 24-bit PNG supports full eight-bit transparency. The transparency is
controlled by the alpha channel. A 24-bit PNG can have antialiased,
translucent edges.

There are two ways to do this. The first is simply to create the image
transparently in Photoshop using layers; if the edges of the image are
antialiased, the PNG will have antialiasing in the transparency.

The second is to create an alpha channel with antialiased edges (all the
Photoshop selection tools can create antialiased edges) and use the
alpha channel for the PNG transparency.

--
Photography, kink, polyamory, shareware, and more: all at
http://www.xeromag.com/franklin.html

Thank you. Did you actually mean 32-bit PNG?
Tomasz J

"tacit" <tacitr@aol.com> wrote in message
news:tacitr-5108E3.15591702052007@netnews.comcast.net...
> In article <vr7h33tldet9mf609r6bif4t1dg57habbd@4ax.com>,
> Sir F. A. Rien <jaSPAMc@gbr.online.com> wrote:
>
>> The query should be:
>> >Is it possible at all?
>>
>> No.
>>
>> To blend you must have the item to be blended with.
>>
>> The 'effect' can be achieved with sharp edges, but not 'blending'.
>
> False.
>
> A 24-bit PNG supports full eight-bit transparency. The transparency is
> controlled by the alpha channel. A 24-bit PNG can have antialiased,
> translucent edges.
>
> There are two ways to do this. The first is simply to create the image
> transparently in Photoshop using layers; if the edges of the image are
> antialiased, the PNG will have antialiasing in the transparency.
>
> The second is to create an alpha channel with antialiased edges (all the
> Photoshop selection tools can create antialiased edges) and use the
> alpha channel for the PNG transparency.
>
> --
> Photography, kink, polyamory, shareware, and more: all at
> http://www.xeromag.com/franklin.html

In article <f1c5tg$kbk$1@atlantis.news.tpi.pl>,
"Tomasz J" <nospam@nospam.nospam> wrote:

> Thank you. Did you actually mean 32-bit PNG?

PNGs with alpha transparency are referred to in Save for Web as
"24-bit," even though technically they are 32-bit (RGBA) files.

--
Photography, kink, polyamory, shareware, and more: all at
http://www.xeromag.com/franklin.html