Graphics mode of acquired image.

Values of this enumeration:

• QVGA - 320x240
• VGA - 640x480
• WVGA - 752x480
• SVGA - 800x600
• XGA - 1024x768
• SXGA - 1280x1024
• UXGA - 1600x1200
• QXGA - 2048x1536
• QSXGA - 2592x1944
• WQUXGA - 3840x2748