Subtraction Strategies
{"Image Make": "Apple", "Image Model": "iPhone 4S", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "6.0.1", "Image DateTime": "2012:12:05 16:40:19", "Image ExifOffset": "192", "GPS GPSLatitudeRef": "N", "GPS GPSLatitude": "[38, 5309/100, 0]", "GPS GPSLongitudeRef": "W", "GPS GPSLongitude": "[77, 1/10, 0]", "GPS GPSAltitudeRef": "0", "GPS GPSAltitude": "14", "GPS GPSTimeStamp": "[21, 40, 1824]", "GPS GPSImgDirectionRef": "T", "GPS GPSImgDirection": "17342/7441", "Image GPSInfo": "582", "EXIF ExposureTime": "1/30", "EXIF FNumber": "12/5", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "50", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2012:12:05 16:40:19", "EXIF DateTimeDigitized": "2012:12:05 16:40:19", "EXIF ComponentsConfiguration": "", "EXIF ShutterSpeedValue": "6325/1289", "EXIF ApertureValue": "4312/1707", "EXIF BrightnessValue": "23317/5435", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "107/25", "EXIF SubjectArea": "[1631, 1223, 881, 881]", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "199", "EXIF ExifImageLength": "217", "EXIF SensingMethod": "One-chip color area", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF FocalLengthIn35mmFilm": "35", "EXIF SceneCaptureType": "Standard"}