what's the relation between a resolution and the size of pixel?

Hello, An image with a resolution of 0.254 mm * 0.254 mm means that a pixel size is 0.254 mm??? thanks

Answer 1

[Matt Fig]

Sounds like it. Resolution is how many pixels per unit linear measure, so in the U.S. we would say

1/pixelsize = 1/(.254) = 1/(.01) = 100 pixels per inch (ppi)

ImageAnalyst will correct me if I am wrong, but I think this is how it works.

[Image Analyst]

It's possible to have more pixels than your actual spatial resolution if your image is blurry. Plus it depends on how you define resolution. Some people say you need at least a pair of pixels to resolve two things that are located side by side. One pixel has one object, then a blank pixel for the second pixel, then the other object at the next (third) pixel.

[Pamela Paolo]

To convert a resolution from mm to ppi for example 0.254 mm * 0.254 mm= ?? dpi should I do this 1/0.254???

[Walter Roberson]

25.4 mm/inch / 0.254 mm/pixels = 100 pixels/inch

[Matt Fig]

You need to have the conversion factor in there too, Pamela:

(1pix/.254mm) * (25.4mm/inch) = 100 pix/inch