transparent PNGs are *not* transparent in Internet Explorer!?

I made my plot PNGs transparent. For some reason this works
in Firefox but not in Internet Explorer.

Anyone know why?

chris

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Christian Seberino, Ph.D.
SPAWAR Systems Center San Diego
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Phone: (619) 553-9973
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Chris Seberino wrote:

I made my plot PNGs transparent. For some reason this works
in Firefox but not in Internet Explorer.

Anyone know why?

There is a known problem with transparent PNGs in IE, one of the reasons that they haven't become as popular as you might have expected/hoped.

This article gives some background, although this was just one search result I found :slight_smile:
   http://www.pcmag.com/article2/0,1759,1645331,00.asp

According to the article the problem appears where the palette size is not 256. Perhaps there is a workaround which could be used in the png output code? Or perhaps 256 colours is often not suitable - eg. antialiasing is used in output (requiring more colours)?

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Neil