Q: When I open a color image with Griaule AFIS WSQ sample, why is the image displayed in graycale?
A: Griaule AFIS WSQ was designed to handle fingerprint images that are always grayscale images. So, when a color image is read, it is converted to gray-scale.
Q: What is the difference between lossy compression and loss-less compression?
A: A loss-less compression method is one where compressing data and then decompressing it retrieves the original data. Compressing data and decompressing it with a lossy compression method will result in data different from the original. In many cases, like fingerprint images, it is possible to reach a great compression with a small loss using lossy compression methods.
Q: What is the best TIFF compression mode for fingerprint images?
A: TIFF format is not the best choice to store fingerprint images. However, even if, with that in mind, you wish to store fingerprint images in TIFF files, it is recommended to use a loss-less compression method, like deflate compression or packbits.