The first digit assigned to all Visa cards is four, and the second through sixth numbers are connected to the financial institution. Then, either the seventh through 12th numbers, or the seventh through 15th, are the account number, while that final 13th or 16th digit is the check number.
Limited color, Lossy format, small file. GIF(Graphics Interchange Format) is limited to an 8-bit palette, or 256 colors. This makes the GIF format suitable for storing graphics with relatively few colors such as simple diagrams, shapes, logos and cartoon style images.
The JPEG file format is a compressed format, with some loss of quality during compression. It is a popular web format due to the generally smaller size of files compared to other formats. File extensions are .jpg, .jpeg, and .jpe. It's a file extension for graphic files with the certain method of compression. Usually jpg files take less disk space then, for instance, tiff files. The extension JPG refers to JPEG files. The E is omitted to fit it into the (deprecated) 8.3 file name notation. JPEG stands for Joint Photographic Experts Group, the name of the committee that created the image standard.