How get transparent index for indexed image?

Hello,
In my fileformat plugin on writing I can't get transparent
color for indexed image. For RGB
image I got transparent data from alfa channel in data of FormatRecord.
The FormatRecord structure has value
transparentIndex (for GIF), but it always =0
(even, if in the image transparent index=12, for example).
How can I get transparent index? Or, if it possible, how get transparent
data for indexed image in alfa channel?

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How get transparent index for indexed image?

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