format difference in saving and loading png images

Hi

I am facing a strange problem.

I am saving a surface i created with format 4, i.e. RGB16, (stride=2) to a
file using *cairo_surface_write_to_png()*
*
*
later, when i load the same file using *cairo_surface_create_from_png(), *i
get a format of 1, i.e. RGB24 and a stride of 4.

Any ideas why this is happening? Is this expected response?

Thanks,
Ravi
p.s: sorry for mixed fonts!

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