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 JPG file type is primarily associated with 'JPEG/JIFF Image'. A lossy bitmap image format used by digital cameras and to display photographs on the Web (along with many other like uses). If you plan to edit a JPEG file save it first as a BMP or other lossless bitmap format. Edit that and then use SaveAs to resave as a JPEG file. If you edit and reedit a JPEG file you will suffer a compression loss on each read/save operation. The Macintosh type is: JPEG.