Hi,
Zhang Weiwu [EMAIL PROTECTED] writes:
Thank you Michael Schumacher for helping me on the IE transparent
pixel problem last time.
Now I have a question: is it possible to create a png file with
indexed color, with transparent pixels, while still have an alpha
channel, so that the png file display alpha channel on cool browsers
like Mozilla, while display transparent pixels on some inferior
browser like IE as a fall-back mechanism? If GIMP cannot do it, can it
be done in theory?
I know the question might be silly, because I can dig it out by
RTFM. But I just wish a quick answer so I don't have to waste time on
impossible things:)
The PNG file format supports it but GIMP can't create such files and I
have no idea how IE would render them
From http://www.libpng.org/pub/png/pngintro.html:
But PNG supports alpha information with palette images as well; it's
just slightly harder to implement in a smart way. A PNG
alpha-palette image is just that: an image whose palette also has
alpha information associated with it, not a palette image with a
full alpha mask. In other words, each pixel corresponds to an entry
in the palette with red, green, blue and alpha components. So if you
want to have bright red pixels with four different levels of
transparency, you must use four separate palette entries to
accommodate them. (All four entries will have identical RGB
components, but the alpha values will differ.) If you want all of
your colors to have four levels of transparency, you've effectively
reduced your total number of available colors from 256 to 64.
Sven
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