Initializes the image structure but does not allocates image data.
* See also \ref imDataType and \ref imColorSpace.
* The only addtional flag thar color_mode can has here is IM_ALPHA.
* To release the image structure without releasing the buffer,
* set "data[0]" to NULL before calling imImageDestroy.
* \ingroup imgclass
Initializes the image structure but does not allocates image data. * See also \ref imDataType and \ref imColorSpace. * The only addtional flag thar color_mode can has here is IM_ALPHA. * To release the image structure without releasing the buffer, * set "data[0]" to NULL before calling imImageDestroy. * \ingroup imgclass