saved bitmap size

Hi group, I've got a question about the size of a saved bitmap.
What I need to do is open a bitmap if it needs resizing, resize and save it.
This isn't a problem, but the problem I have is that the original image has
got an 8 bit indexed pixelformat,
but you can't create a graphics object for this pixelformat so my bitmap
uses the default pixelformat:
Format32bppArgb, but this ofcourse result in a much larger file size (420kB
instead of 106kB)
I know I can use for example Format24bppRgb and this reduces the size to
300kB but I would like to know if I there's a way I can keep the size at
106kB

Thanks in advance

Greetz Peter


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