Final answer:
A header parameter in the Photoshop Raw file format stores camera settings and metadata.
Step-by-step explanation:
In the Photoshop Raw file format, a header parameter is used to store camera settings and metadata. This information includes details about the camera used to capture the image, such as the make, model, exposure settings, lens information, and more. It also stores other important metadata like image dimensions, color space, and creation date. The header parameter is essential for understanding the technical aspects of the image and is used by various software and devices to interpret and process the raw image data.