oops, i should explain clearer.
the individual rectangles, are drawn with 4R, 5R, 6R, 8R and S8R papers' sizes, to scale. that explains the 4"x6", and other similar markings on the surface. this way, you can see the direct physical sizes of your prints, depending on how big you're printing them.
next, on the left, there's a table listed there. it indicates the HxW pixel dimensions to get the respective Megapixel count (MP).
1.0 MP - 1280 x 960 (min for 4R)
2.0 MP - 1600 x 1200 (min for 6R)
3.3 MP - 2048 x 1536
4.0 MP - 2272 x 1704
5.0 MP - 2592 x 1944
6.0 MP - 3072 x 2048
so in other words, if you ended up cropping a picture with a 2705x1932 dimension, and if you compare it with the 6R dimension (which is, 1600x1200), you can see that both H and W dimensions for the picture far exceed that required of a decent 6R print, so you can print it out at 6R or even more without getting poor quality.
or in another way to look at it, if you want to print 6R shots, you must have at least 1600x1200 pixels in your photos if you want good quality.
alternatively, if you count MP's before you print, 2705x1932 is immediately known to be more than 5 MP, so you can print much larger without problems, assuming you know how large you usually print your 5 MP shots.
once you compare that to the canon jpg that i attached as a URL, you can see that you can supposedly print somewhere in between 11"x14 to 13"x19" without problems.
anyone else who can explain my intention, please go ahead.