At very low values your image will indeed deteriorate, but at very high values the JPEG process will be visually lossless that is, it really will look as good as the original camera image. In return, you get to specify a quality factor indicating how much compression you want. JPEG is a lossy compression format, meaning that the result of loading your JPEG file is no longer identical to the image that you started from, though the differences are arranged to be ones that you will least notice. Usually, JPEG files are given the extension. The default file format used by libcamera-still is JPEG because of the very wide support that it has, combined with a useful level of compression. Images are normally encoded in some way (often they are compressed so that they aren’t so large) and then saved to a standard file format on the disk. Autofocus is available on Raspberry Pi Camera Module 3, enabling you to focus in on specific parts of an image Image encoders and file formats
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