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Change the PPI of the image. A larger PPI makes the print smaller.The problem I'm seeming to have is that my image is too big to make an 8x10. Is there any way I can fix this?
At full resolution your D3100 make photos that have pixel dimensions of 4608 x 3072 pixels.
4608 x 3072 pixels assigned at 100 PPI will print 46.08 inches by 30.72 inches. At 300 PPI the same 4608 x 3072 pixels will print 15.36 inches by 10.24 imches.
If you need the long side to be 11 inches - 4608 pixels divided by 11 inches = 419 PPI. The short side will then be 3072 pixels divided by 419 PPI = 7.33 inches.
Then you can put the image on an 8.5 x 11 inch canvas using CS5.
To get an 8x10 out of the original there is no avoiding the need to crop, but you can put an uncropped orignal onto an 8x10 canvas but there will be some white border.
Here are the 3 equations you need to use:
Pixels .. divided by .. inches = pixel per inch (PPI)
Pixels .. divided by .. PPI = inches
Inches .. times .. PPI = pixels
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