This picture is of the underside of a Banana tree's leaf. The light is coming through the leaf. It was made on a partly cloudy day, and the bright streak is diffuse sunlight coming between leaves above the one being photographed.
The camera recorded the following information in the original image file:
Nikon D200
2006/09/30 14:05:42.1
Color
Data Format: RAW (12-bit)
Compression: None
Image Size: Large (3872 x 2595)
Lens: 105mm F/2.8
Focal Length: 105mm
Exposure Mode: Aperture Priority
Metering Mode: Matrix
1/100 sec - F/10
Exposure Comp.: -0.3 EV
Flash Sync Mode: Not Attached
Sensitivity: ISO 320
Color Mode: Mode I (Adobe RGB)
Hue Adjustment: 0
Gerald & Irmgard Carter
White Balance: Preset d-0
AF Mode: AF-S
Tone Comp: Auto
Saturation: Auto
Sharpening: Auto
Long Exposure NR: Off
High ISO NR: Off