Photoshop: Ruler measure tool properties (presets)

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  • Updated 3 months ago
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I have PhotoShop 2020 (v21.1) on a new 16" MacBook Pro running MacOS Catalina.  I am measuring lengths with the ruler tool in photos, as I did without trouble on an older Mac and older PhotoShop version.  The line it draws for the ruler is so faint (gray and 1 pixel wide) that it is virtually invisible on my photos, which are largely a similar color (they are DIC microscope images so colors are washed out).  On the pulldown menu for the ruler tool, it says "No Tool Presets Definable for the Current Tool."  Is it really impossible to change the thickness or color of the measuring line for better contrast with the image?  Is this a problem with the higher pixel resolution of the display on the new MacBook?  Help!
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Bill Henley

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Posted 3 months ago

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Yves Crausaz

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Hello, try to use a topic of color more clear! !

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Bill Henley

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Not sure what you mean, but here is a screen capture showing how nearly invisible the line is (indicated by arrow).
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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Hi Bill, try turning on Preferences > Performance... "Use Graphics Processor" and restart Photoshop. Do the measurement lines look better?
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Bill Henley

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Interestingly, that option was already checked, as was the Advanced Settings option to use "Advanced Drawing Mode."  Nevertheless, when I unselected and reselected "Use Graphics Processor" and restarted Photoshop, it now looks good like on my old computer (screen capture attached), so thank you!  Does the "Screen Resolution" setting under "Units and Rulers" make any difference for this or anything else in PhotoShop?  The default was 72 pixels/inch, which seems very low for my computer.


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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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The GPU drawing takes in account HiDPI screens and does the right thing. The non-GPU path assume standard resolution monitors of yesteryear.
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Bill Henley

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By the way, you've just saved my eyesight and sanity!
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Doug S

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Jeff,  you have replied so many times with helpful solutions....we really appreciate your assistance and knowledge about Ps.
Thanks. Good to know Adobe is responding.