CmdCapture is a screen capture command line utility for Windows that offers an easy yet strong approach to the screen capture automation.

CmdCapture accepts up to three pairs of parameters:
/f
Followed by the filename you'd like to use. CmdCapture uses the file extension to determine the output file type. The extension should be one of the following values: png Save a PNG file.
jpg Save a JPEG file. See also "-q" for more parameters.
bmp Save a Windows bitmap file.
tif Save a TIFF file.
xpm Save an XPM bitmap file.
The default file type is PNG. The default file name is based on your local time, and the format is:
CmdCapture - YYYY-MM-DD hh.mm.ss.png : YYYY: Year with century, as decimal number
MM: Month as decimal number (01 - 12)
DD: Day of month as decimal number (01 - 31)
hh: Hour in 24-hour format (00 - 23)
mm: Minute as decimal number (00 - 59)
ss: Second as decimal number (00 - 59)

/d
Select folder to output captured image files. If you didn't specify file name with full path, or you left file name parameter blank, a file with default name will be put into the folder specified in this area.
/q
Only available for JPEG file format and let you pick a file size vs. image quality tradeoff. This parameter should be followed by a number from 1 to 100 (inclusive) where 1 is the lowest quality and 100 is the highest. The default is 75.
/h
Displays help on the command line parameters.

The license of this software is Freeware, you can free download and free use this screen capture software.