The most common file extensions for image files are:
GIF: Old, can be animated, 8-bit color
JPEG/JPG: High compression rate, No transparency, lossy
PNG: Can be transparent, lossless
The extension .jpeg tells us the file is an image file
R3D is a file extension associated with Realsoft 3D Image.
Nero CD image file
Image file
"ico" is a common extension for an icon. An icon is the image you see in a file browser or on your desktop. That icon will represent a file.
A tiff file contains image data.
imagex
imagex
A jpg otherwise known as jpeg is an image file. When you save an image from the internet .jpg or .jpeg is the default save extension.
The three letter extension at the end of every file name is for windows to identify the file format. Some Common file extensions are: .BAT -DOS batch file, .BMP - a bitmap picture image, .DOC -Microsoft Word word processor file format, .EXE -Executable file, .GIF - Graphic Image Format file, .HTM or .HTML, .JPG - Joint Producers and Engineers of Graphics file format, .PDF -Portable Document Format.
.txt is a common choice.
Nothing. .jpg is the default file extension for saving non-animated images.