RObert Budding
D'oh!
Below is a table I calculated showing how large a print @ 300dpi can be printed for each sensor resolution without interpolation, assuming a 2:3 aspect ratio:
Sensor Dims (pixels) Print @ 300 DPI
Sensor MP W L W L
6 2,000 3,000 6.67 10.00
8 2,309 3,464 7.70 11.55
12 2,828 4,243 9.43 14.14
18 3,464 5,196 11.55 17.32
21 3,742 5,612 12.47 18.71
So a 12MP chip will print to about 9x14 without interpolation. Going to 21 MP gets you a 12x18 at the same print resolution.
Sorry, I can't get the table to format as I'd like. Columns are:
1. Sensor resolution
2. Sensor width in pixels
3. Sensor length in pixels
4. Print width @ 300dpi in inches
5. Print length @ 300dpi in inches
Sensor Dims (pixels) Print @ 300 DPI
Sensor MP W L W L
6 2,000 3,000 6.67 10.00
8 2,309 3,464 7.70 11.55
12 2,828 4,243 9.43 14.14
18 3,464 5,196 11.55 17.32
21 3,742 5,612 12.47 18.71
So a 12MP chip will print to about 9x14 without interpolation. Going to 21 MP gets you a 12x18 at the same print resolution.
Sorry, I can't get the table to format as I'd like. Columns are:
1. Sensor resolution
2. Sensor width in pixels
3. Sensor length in pixels
4. Print width @ 300dpi in inches
5. Print length @ 300dpi in inches
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