I am of the understanding that the ASI 224MC can output 14 bits per pixel. In monochrome mode, I see an option for 16 bit, but for color, all I see is RGB24 (8 bits per pixel). I looked at OACapture's fit files and only saw 8 bits per pixel.
RGB24 is 8 bits per color per pixel - 24 bits in total after debayering.
Sounds like you want RAW16 which you could debayer in software. This would be the 14 bit result left shifted 2 bits (multiplied by 4) to make up the 16 bits.
The SDK offers:
ASI_IMG_RAW8 = 0,// 1 byte every pixel
ASI_IMG_RGB24,// Each pixel consists of RGB, 3 bytes totally (color cameras only)
ASI_IMG_RAW16,// 2 byte every pixel
ASI_IMG_Y8,// mono mode,1 byte every pixel (color cameras only)
I thought I had used 16 bit before successfully. I don't know if it's the PixInsight BPP script missing the debayer step (complained no CFA images) post upgrade to 1.8.5 or something else. I was able to successfully debayer the files I thought were 16 bit monochrome.