On a black and white image, is there a way to calculate how much black and how much white is used?

Sorry, I'm needing the answer in square mm.

Yes, with a macro. I have a simple one that gives area of shape in sq mm. 

Hi Myron, sounds good, are you able to share? I'm not familiar with macros so would also need some help with that.

There you go Myron has a simple solution like

Sub AreaOfShapeMM()
ActiveDocument.Unit = cdrMillimeter
MsgBox Round(ActiveShape.DisplayCurve.Area, 2) & " Sq mm"
End Sub

1. Open Macro Manager docker (Alt+shift+F11) or Windows/Dockers/Macro Manager
2. Right-click on Visual Basic for Applications & choose
New Macro Project.
3. Name the file with no spaces i.e. AreaOfShapeMM to
C:\Users\Myron\AppData\Roaming\Corel\CorelDRAW Graphics Suite X7\Draw\GMS
Hit Save.
4. You’ll see it pop up at the bottom of the Macro Manager list, click off off it
then right click and choose New Module.
5. Click off the the New Module then right-click on it and choose New Macro
6. Copy/paste all code given over the “Sub Macro1() End Sub”
7. Select a shape then double-click the macro
8. Now you can assign a keyboard shortcut of your choosing to it. Right-click on the macro
from the Macro Manager and choose Assign Keyboard Shortcut.
9. type the shortcut you want in and hit assign.

Hi Myron,

Thank you.

I've done that, not sure if it is working, where do I see my results, do I need to open something?

open macro manager, find your macro, select the shape you want to get the sq mm, double-click the macro