I looked at ya chart and there's something i dun understand.
In the row of 4R prints, the print size is 4" x 6". You have 4 reccomended resolution (150dpi, 200dpi...400dpi). Under each resolution, you have different sets of values again (etc: 150dpi-600x900). Does the 600x900 corresponds to the number of pixels present in width and breadth of the picture? Hence the higher the dpi, the larger is the number of pixels present in the image?
I have a seperate question: What is the dpi of an image taken by a 4 Mega Pixels camera in the 'L' & "Finest" quality.