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How to find out if a file's alpha channel is Straight or Pre-Multiplied

Nov 15, 2013, 11:40
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How to find out if a file's alpha channel is Straight or Pre-Multiplied
Hi All
I'm receiving files that I need to convert in another application selecting 'Shaped' or 'Unshaped' depending on how the received file's alpha channel has been rendered - Straight or Pre-multiplied. I understand what the difference is here, but to save time I was wondering if I can grab a frame from one of these targa sequences, open it in GIMP use it to determine if the sequence has been rendered out as Straight or Pre Multiplied? If it's possible can you tell me how?
Many thanks for any tips!
D
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