 Dark-frame subtraction

Dark-frame subtraction is a technique used in imaging, particularly in astrophotography and other forms of digital photography, to improve the quality of images captured in low-light conditions. The procedure involves the following steps: 1. **Capture a Dark Frame**: A dark frame is an image taken with the same camera settings (exposure time, ISO, etc.) as the actual images but with the lens covered or without any light entering the sensor.