(a) Arch category. (b) Game category. (c) Nature category. (d) Object category. (e) People category. (f) Hybrid category. Figure 5: Example images from the PIM set that resemble the respective PRCG shown in Figure 4 in terms of the content. From RAW images, we can generate images of different in-camera image processing operations such as white-balancing, sharpening, contrast adjust- ment, as well as compression.  As a result, both uncompressed or lossy- compressed images can be obtained from RAW images. It is possible that the built-in image processing operation in a camera may be different from that of the RAW processing software. We assume that the operations in the software supplied by the camera manufacturer are not too different from those built into the camera, even if they are not identical. 5.1.2   EXIF Metadata of PIM The EXIF metadata records the camera settings for which an image is cap- tured which include camera model, shooting date and time, shooting mode (e.g. auto or manual mode), shutter speed, aperture value, exposure com- pensation, metering mode, ISO Speed, lens focal range, focal length, image quality, flash setting, white balance and so on. The EXIF format is a tem- plate and the amount of information actually provided is camera dependent. EXIF format metadata can be extracted using the camera manufacturer software or freeware such EXIF Reader³. ³see  http://www.takenet.or.jp/^»ryuuji/minisoft/exifread/english/ 16