caption: a large group of pictures with different equipment and images
exif: {"Image XResolution": "479933/5000", "Image YResolution": "479933/5000", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "www.meitu.com", "Image DateTime": "2016:05:26 18:19:54", "Image ExifOffset": "136", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "302", "Thumbnail JPEGInterchangeFormatLength": "0", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "2000", "EXIF ExifImageLength": "1200"}