Color conversion to 16-bit Lab

Hi,

I have rasterized a document using the AIRasterizeSuite and got the colorspace (ai::ColorSpace) and pixel data (AIImageComponent *) from the raster object.

FYI, the color space at this point is kAIColorSpaceFamilyNChannel (process + spot).

Now I can convert the pixel data to an other color space using sAIColorCorrection->ConvertImageColorEx with a destination color space set to kAIColorSpaceFamilyLab.

However, the output seems to be always 8-bit even when I set the dstBitsPerPixel to 48 (3*16) to try to get 16-bit Lab output (and of course allocate enough memory for the output buffer).

Since 8-bit Lab is useless to me due to precision, does anyone know how to output 16-bit Lab ?

I also tried to output the data to kAIColorSpaceFamilyRGB, then convert it to Lab but the out of gamut colors will be off.

Thanks.