Although aesthetically displeasing, tannins do not pose a health issue. However, if tannins are found in the water, it can indicate that your water is significantly influenced by surface water. Put simply, this means that if tannins can travel easily from surface water to your groundwater source, pathogens can easily travel through as well.
JPG is a file extension for a lossy graphics file. The JPEG file extension is used interchangeably with JPG. JPEG stands for Joint Photographic Experts Group who created the standard. JPG files have 2 sub-formats, JPG/Exif (often used in digital cameras and photographic equipment), and JPG/JFIF (often used on the World Wide Web).
JPG files, also known as JPEGs, are a common file format used primarily for digital photographs and other complex still images. JPG is pronounced jay-peg and stands for Joint Photographic Experts Group, the committee that created the file type. JPG files have the file extension .jpg or .jpeg and are, in fact also called JPEGs. They are the most common file type for images taken with digital cameras and are widely used for photos and other graphics used on websites.