Image scaling

Hello,
I have a question - I need to scale large image (e.g. 10000x10000pix) in C.
Its Format is unknown (it may be PNG, GIF, BMP or TIFF). The way I'm doing it
is:

im_in_gm = BlobToImage(image_info, mem_in, *size, &exception);
im_out_gm = SampleImage(im_in_gm, 150, 150, &exception);

but it consumes a lot of memory.

Is there any way to load image to a image buffer 150x150, that has been set up
before loading image to memory to avoid such behaviour?

Thanks a lot,
Michał

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