I wonder is it possible to render `Graphics` in *Mathematica* with bitdepth higher than `"Byte"` which is the maximum bitdepth supported by the Windows XP operating system (it is so-called "True Color")? Tracing the rasterization with the option `TraceInternal->True` shows that `Graphics` is always rendered to a matrix of `Integers` in the range from 0 to 255, then it may be converted to `Reals` if requested but such conversion does not increase the bitdepth, of course: it changes only the internal representation of the `Image`. For example, let us consider rendering of `VertexColors`:

    Cases[Trace[
      Image[Graphics[
        Polygon[{{-1, 0}, {1, 0}, {0, Sqrt[3]}}, 
         VertexColors -> {Red, Green, Blue}], ImageSize -> 4], "Real"], 
      TraceInternal -> True], 
     x_List /; MatrixQ[Unevaluated@x, NumberQ], {1, Infinity}]

One can see matrixes of values between 0 and 255 in spite of requested `"Real"` bitdepth. Let us compare the results of rendering with different requested bitdepths:

    In[21]:= Image[
      Graphics[Polygon[{{-1, 0}, {1, 0}, {0, Sqrt[3]}}, 
        VertexColors -> {Red, Green, Blue}], ImageSize -> 4], "Real"] === 
     Image[Image[
       Graphics[
        Polygon[{{-1, 0}, {1, 0}, {0, Sqrt[3]}}, 
         VertexColors -> {Red, Green, Blue}], ImageSize -> 4], "Byte"], 
      "Real"]
    
    Out[21]= True

It is obvious that the requested bitdepth does not change the real rendering bitdepth. 


So the question is: is it possible to render `Graphics` with bitdepth higher than `Byte`?