| Re: Scaling image is losing background transparency [message #171713 is a reply to message #171712] |
Mon, 17 January 2011 23:38   |
Thomas 'PointedEars'
Messages: 701
Registered: October 2010
Karma:
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Senior Member |
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Henrik Carlqvist wrote:
> Michael Fesser <netizen(at)gmx(dot)de> wrote:
>> GIF is completely dead, there's not a single reason to use it anymore.
Only a Sith deals in absolutes.
> Png with alpha transparency is really better than transparent gif files.
No, it really is not. Meaning, it depends. In many cases you will be
better off (in compatibility, and download size) creating a GIF image
indexed to your needs than supplying a PNGA image. Where compatibility is
concerned, see if you can supply IE6 and 7 (yes, the former is still in use
beyond its end-of-life, and you cannot always convince people/companies to
upgrade) with a corresponding replacement GIF image through Conditional
Comments. Where size is concerned, see which file is smaller and fits best
to your layout (you would choose PNGA over GIF where the image contained
more than 256 different but important colors, or was to be displayed against
a randomly changing background color or image, for example).
> However, is there any good alternative to animated gif files on the web?
Unfortunately, no. And I am sorry to say, in hindsight (and back then,
foresight already), IMHO we have to thank the Mozilla Drivers for that.¹ :-(
> Yes, there is apng which in theory might be able to replace animated gifs,
> however in practice animated gifs has more widespread support.
Indeed. *sigh*
> Also, the major reason for developing the .png format was that unisys had
> a patent for the compression algorithm used in .gif. I don't think that
> patent is valid anymore.
It has expired world-wide in 2003/2004 CE.²
PointedEars
___________
¹ <http://en.wikipedia.org/wiki/APNG>
<https://bugzilla.mozilla.org/show_bug.cgi?id=18574> (please vote for,
but don't spam this bug. TIA.)
² <http://en.wikipedia.org/wiki/GIF#Unisys_and_LZW_patent_enforcement>
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