What are calibration frames in astrophotography?
Calibration frames are additional exposures used to improve the quality of astrophotography images and reduce noise from outside sources. There are three common types of calibration frames used, Dark Frames, Bias Frames, and Flat Frames. From thermal noise and hot pixels to sensor readout noise and uneven field illumination, each type of calibration frame tries to reduce a specific type of noise from the initial images. These calibration frames are normally taken alongside your images while the camera is in the same configuration and temperature and are then subtracted from the initial images reducing the noise and improving the quality.
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
4. If no context is provided use your internal knowledge to answer.
system
(Optional) Context information is below.
----------------

----------------
Answer the following query.
What are calibration frames in astrophotography?

user
Calibration frames are additional exposures used to improve the quality of astrophotography images and reduce noise from outside sources. There are three common types of calibration frames used, Dark Frames, Bias Frames, and Flat Frames. From thermal noise and hot pixels to sensor readout noise and uneven field illumination, each type of calibration frame tries to reduce a specific type of noise from the initial images. These calibration frames are normally taken alongside your images while the camera is in the same configuration and temperature and are then subtracted from the initial images reducing the noise and improving the quality.
assistant