How to calculate RAM usage of a image when decoded -

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how can determine ammount of ram used image when loaded?

for standard think image size on ram width * height * pixel_format, pixel_format rgb (3 bits) or argb (4 bits)

but calc, 64*64(argb) image have 2mb of memory usage, i'm pretty sure wrong result.

is decoded image loaded compressed image , decompressed drawing/drawed compressed through decompressers algorithms?


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