The fingerprint image format used in the Fingerprint SDK library is an array of width * height unsigned bytes. Each byte represents a single pixel of the image. The array is arranged in left to right, top to bottom order. There's no padding, each line immediately follows the previous one. Each pixel has a grayscale value ranging from 0 (pure black) to 255 (pure white). This format does not store information about the resolution or size (width and height) of the image.
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On GrFinger 4.1 FREE and LIGHT versions, the fingerprint images captured from the fingerprint readers couldn't be used for any other purpose because they were encrypted. Although Fingerprint SDK doesn't encrypt the fingerprint images, it accepts encrypted images as input for backward compatibility purposes. |
