How 384x512x3 image coordinates convert in to mm or cm?

i had image specification 384x512x3 units 8. now i had done some calculation which come up with x and y coordinates. how will convert this x and y values into mm or cm?

[Adam]

You can resize a figure containing an image of a given pixel size so it could map to any size.

Answer 1

[TastyPastry]

You really can't, unless you have some specification for how many pixels/cm your print or display is supposed to be.

For example, if you are making a GUI and you need to determine its size and/or position on a display, the uicontrol() option 'position' is specified as:

 Pixels.

 Starting in R2015b, distances in pixels are independent of your system resolution on 
 Windows® and Macintosh systems:

    On Windows systems, a pixel is 1/96th of an inch.

    On Macintosh systems, a pixel is 1/72nd of an inch.

 On Linux® systems, the size of a pixel is determined by your system resolution.

Here, if you're trying to do a pixels -> inches conversion, you have a conversion standard.

There needs to be some sort of metric by which you're using to convert pixels to a physical measurement.