Image Category for the Personal Columbia  Set    Count indoor-light 74 indoor 68 outdoor-day 277 outdoor-night 34 outdoor-rain 63 outdoor-dawn-dusk 31 natural 111 artificial 142 Total 800 Table 7: Image count for the categories within the Personal Columbia Set 5.1.3   Diversity of the Personal Columbia  Set The PIM are designed to have diversity in the major variables of a photo- graphics process: 1.  Illumination source/lighting condition: There are content categories of indoor-dark, indoor-light, outdoor-dawn-dusk, outdoor-day, outdoor- night and outdoor-rain. 2.  Object - There are content categories of natural and artificial. 3.  Camera - The images are taken by two models of SLR cameras, i.e., Canon 10D and Nikon D70, which are known to have different makes of in-camera image processor. 4.  Photographer/personal photographing style: We have three photog- raphers identified as `martin', `jessie' and `tian-tsong' in the dataset meta-inforation. Figure 6 shows the example images for different lighting and object cat- egories mentioned above.  Table 7 shows the count of the images in each category. 5.2   The Personal Greenspun  Set The personal Greenspun set is from the personal collection of Philip Green- spun, which is accessible from http://www.photo.net/philip-greenspun/ photos/digiphotos/. 17