> > Do the dump functions in the camlimages library basically create a
> > string equivalent to an RAW image file?

> Yes.
>
> RGBRGB... stream for 24bit-depth image for example. Size is equal to
> 3 x width x height.

(maybe you don't mind, but just in case)
there are such features in OCaml/ImageMagick too.
you can load all the image data (in jpg, png, raw, etc..) in a string (which 
is usefull for exemple to send an image to a web browser from a cgi-bin)

you can get all the data in a BigArray too for direct exchange of data between 
ImageMagick and OCaml (which feature is only available in the devel version 
of the binding yet)

Florent