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Brendan WhitingFront End Web Development Techdegree Graduate 84,703 Points
Gridline divisions seem to work differently
I did the same subdivisions as the video but it looks different. Is it subdivisions “of” 20px as you say? In my version there it divides the 100px into a 20 X 20 grid. What I see in the video doesn’t make sense.
Gridlines on video: http://imgur.com/a/qukln
My gridlines preferences: http://imgur.com/a/m7k4r
My gridlines: http://imgur.com/a/HEAiB
I'm on a 15" Retina display. At 100% my subdivision setting of "20" looks like yours. But when I zoom out to below 60% then it looks like the video.
The instructor definitely set his preferences to "20". And I'm going to chalk this visual discrepancy up to a resolution or display difference. Illustrator CS6 was introduced in the first half of 2012. And the video is from no later than 2014.
Who knows what combination of rendering, DPI and screen capture resolution settings he's got going on? Thanks to that complexity of hardware and software differences, this is not unusual.