How to retrieve alpha channel data in format plugin

I want to ask how to get the alpha channel 's data that describle the document's transparent info, in a format plugin.
for example , when open a PNG file in Photoshop, the photoshop set FormatRecord:: planes to 3 (not 4),
in this case i can only request the RGB data.
then how can i get if the pixel is transparent in document ? (that is 0 - completely transparent, 255 - completely opaque)
Thanks~

i have resolved this problem, it's maybe i didnot set the fmtCanWriteTransparency flag in the pipl.
thanks.

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Moderator message - Please ask a specific question - post locked
Edited by: Rob Burbank on Apr 28, 2009 12:00 PM

Dear all
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Moderator message - Please ask a specific question - post locked
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How to retrieve alpha channel data in format plugin

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