Quote:
Originally Posted by mithrandir
You didn't say what values you used for "n" and "p".
Joe said he'd used n=12 and p=5.4
With 24 Mpx and p=3.89 I'm more tempted to use n=20.
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Raymo didn't use my formula to generate the table. I think it's a table based on the old 35mm film rules that my formula is attempting to update. These old formulae are based on assumptions about producing prints of a certain size from 35mm film.
Mine allows you to optimize to a specific output size.
To work out n for my formula look at any image before you take the pictures. size a full size image to the screen size you want and look at the scaling percentage you want to use for display. 100 ÷ scale% x 1.5 will give you a decent value for n.
You can also do it from pixel dimensions.
Example Andrew has a 24MPx camera and wants to display a 1000x1500 image
Sensor has 4000 x 6000 pixels
Display image 1000 x 1500
Scale factor = 4000/1000 = 4
n = scale factor x 1.5 = 6
But if
Sensor has 4000 x 6000 pixels
Display image 400 x 600 pixels
Scale factor 10
n=10 x 1.5 = 15
Joe