yes. you can do it manully with limited accuracy, .

来源: coolwin 于 2013-02-02 18:54:26 [] [旧帖] [给我悄悄话] 阅读数 : (297 bytes)

open the image with Paint or whatever an image editor.

Measure the distance the point you want measure to the grid line on the bottom, in pixel. Measure the distace between two grid lines, also in pixel. Then take the ratio and get the number you want.

 

 

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