Explanation :

Name: Write the name of the image file.

Present : To specify the size of image you may either use
preset or width height option.

Width : set for width worksheets.

Height : set for height worksheets.

Resolution: refers the number of pixels per inch.
Pixel is a single point in a graphic image and a pixel can
have only one colors.

Color mode : set type color.
RGB (Red, Green, Blue) use for desktop.
CMYK ( Cyan, Magenta, Yellow, key(black)) use print images.

Background Contents : set color Background.