Converts any indexed format to any floating point format.

procedure IndexToFloat(NumPixels: LongInt; 
                       Src: PByte; 
                       Dst: PByte; 
                       SrcInfo: PImageFormatInfo; 
                       DstInfo: PImageFormatInfo; 
                       SrcPal: PPalette32);

ImagingFormats (at line 300)