Why is the horizontal resolution doubled when capturing raw?

[mr-wrinkles]

Hi, I am using the HQ camera and I am trying to capture raw cfa data. When I use capture_array() why does the resulting array have the dimensions (3040,8128) when the sensor is 4056x3040?
Sorry if this is a dumb question, I am new to this :)
Thanks!

from picamera2 import Picamera2
import time
import numpy as np

picam2 = Picamera2()
config = picam2.create_still_configuration(raw={"format": "SBGGR10"})
picam2.configure(config)
picam2.start()
time.sleep(1)
raw_data = picam2.capture_array("raw")
picam2.stop()
print(raw_data.shape) # Prints (3040, 8128)

[davidplowman]

Hi, you've asked for unpacked raw pixels so, because they're more than 8-bits wide they have to occupy 2 bytes each. To turn the raw buffer into 16-bit numbers, use raw_data.view(np.uint16).

[mr-wrinkles]

Ah I see. Much thanks!