Does PNG format supports transparency

AB
Posted By
Arvind_bhambhani
May 21, 2004
Views
509
Replies
13
Status
Closed
when is do a save for web in photoshop 7 and choose png-24 format the preview is tranparent (if transp. box is checked)

but when i save the file there is a matte applied (background) to it automatically

if photoshop / png-24 can not save transparent images why it is showning tranp. option in the save for web form

please can the forum help
Related Tags
format png transparency

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L
LenHewitt
May 21, 2004
Arvind,

but when i save the file there is a matte applied (background) to it
automatically<<

When you view in what? MSIE has no native support for 24-bit transparent PNG files.

See: http://support.microsoft.com/default.aspx?scid=kb;en-us;294714
CW
Colin_Walls
May 21, 2004
PNG certainly supports transparency.

How are you seeing the matte? [Bearing in mind that many Web browsers do not support PNG propoerly, if at all.]

Have you created a transparent area on your image? [I have to ask – never ignore the obvious.]
TM
Trevor_Morris
May 21, 2004
Colin,

The only modern mainstream browser that does not properly support PNGs is IE.
TM
Trevor_Morris
May 21, 2004
Arvind,

Here is a test page you can try in your preferred browser:

Alpha PNG Test Page <http://user.fundy.net/morris/pngtest/pngtest.html>

It demonstrates how 8-bit and 24-bit (8bpc) transparent PNGs are rendered by different browsers. It also makes use of the information provided by Len in the above link (post #2).
CW
Colin_Walls
May 21, 2004
Trevor

Not wishing to sound like a M$ groupie, but 90-lots% of users have IE. By definition, nothing else is "mainstream".
TM
Trevor_Morris
May 21, 2004
Fair comment. What I meant was that my comment did not account for lesser known or obsolete browsers – it had nothing to do with market share.
AB
Arvind_bhambhani
May 22, 2004
ok guys i am done ! used the alpha loader filter in IE it works fine
P
Phosphor
May 22, 2004
Stoopid Macrosuck bullies, makin’ up dere own "standids."

I hate dem bastids for doin’ dat sorta t’ing.

GO Mozilla!
MM
Mac_McDougald
May 22, 2004
How does it look in other browsers?

Mac
TM
Trevor_Morris
May 23, 2004
Mac,

It should like fine in ANY browser, if implemented correctly. See the link I posted in #4 above.
MM
Mac_McDougald
May 23, 2004
Thanks, I’ll re-read/study.

M
Y
YrbkMgr
May 24, 2004
Arvind,

ok guys i am done ! used the alpha loader filter in IE it works fine

That doesn’t solve the problem for a visitor to your site; provided of course, that the intent is for web. If a visitor doesn’t have the plug in and is using IE, then they won’t see it with transparency.

Peace,
Tony
TM
Trevor_Morris
May 24, 2004
Plugin? No plugin Tony. AlphaImageLoader is a proprietary IE filter, and if you use a browser detect script, you can easily get the page load/display properly with the majority of browsers – without an extras, like plugins.

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