Is there a way for me to view my work or my whole iMac screen in grayscale? I am working on a job that will be published in print and online in grayscale. Most of the creative work is being created in QuarkXPress.

My problem is that I really need to see how this is going to look in grayscale. 

Up until now I have been exporting the work to PDF in grayscale to see how things look, but as you can imagine this is a slow process.

Is there a setting anywhere in QuarkXPress 9.5.4.0 I can use to view my files in grayscale, or a setting within Mac OS X 10.11.6 that I can use to make my iMac temporarily display in grayscale?
Yes you can! 

Follow these steps:


Go to Apple > System Preferences > Accessibility
In the left hand pane make sure Display is selected
On the right hand side you’ll see a number of checkboxes and sliders
Tick the Use grayscale checkbox


Your iMac’s display should immediately switch to grayscale mode.

TIP: Since you only need grayscale while you’re working on this job, you can tick the Show Accessibility status in menu bar checkbox at bottom left of the Accessibility preferences. This way you can access this setting as you need directly from the menu bar.