Sudden inaccuracy in scale when looking at pages in indesign...

Question

InDesign has always been spot on when working on print files for accuracy on 100% scale. So if I'm working on an A4 document, and I hold up an A4 page against the screen, it's near enough matching to the mm.

Somehow, spontaniously, this is no longer the case and the same A4 when viewed at 100% is looking closer to 130% of actual size as it appears on screen. I'm working on an iMac with built-in rerina dispaly 27 inch (5120 x 2880).

Whether there's a bug in an update to the Mac OS, or a bug in a recent InDesign update, or perhaps I've indervertantly / incirrectly pressed a shortcut key combination that has altered a preference... I don't know.

But it's come out of the blue and is very annoying.

rob day · Answer

Hi @RushfirthLeeds , do you run any startup or regular scripts? InDesign’s display scale can be changed via scripting, but as of version 16.4, not via the UI or preferences.

Normally ID calculates the 100% as print scale by getting the main monitor’s resolution as reported by the OS, you could try resetting your prefs and see if that fixes the problem.

Or, you can run this script which will reset the default, and display an alert showing the resolution the system is reporting. I’m running the same 27" Retina, so it should report 135ppi

app.generalPreferences.useCustomMonitorResolution = false
alert("Your Main Monitor resolution is reported as: " + app.generalPreferences.mainMonitorPpi)

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