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.
Thumbnail image file (Microsoft Clip Gallery v.1.x). THM is an image file format for thumbnails. Images are made smaller for browsing purposes, usually because it is easier to view and takes less time to load. THM files can be viewed by most image preview or editing programs on both Macs and PCs. THM files are similar to. JPEG files, and those .THM files representing image files can usually be converted to JPEG format by changing the name of the file from .THM to .JPEG or .JPG.