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My rulers shows completely wrong messurements

Community Beginner ,
May 04, 2020 May 04, 2020

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Hello! 

I really hope someone can help me!

I had to update my Mac to the latest version (Catalina). I also have the latest Photoshop version (May 2020). Sometime along the updating prosess, my rulers stopped working.

By that I mean; if my document is 25 x 15 cm, my rulers will show i.e. 36,75 x 19,2 cm, or something completely random. My image size settings are working (I´ve checked this against other computers).

This is diffuicult as I am trying to make a book cover and it´s hard to control bleed etc.

I have tried to uninstall photoshop, erasing preferances etc, reinstalled; both older versions and finally the new one, restarted, and restarted, but, problem is still there....

I´ve tried the adobe support chat, but he could´nt fix it, so he just hung up on me...

Anyone who can suggesest what to do?

Thenkful for any advice!

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correct answers 1 Correct answer

Community Expert , May 05, 2020 May 05, 2020

You have the rulers set to pixels.

Right click the ruler and choose Centimeters.

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Community Beginner ,
May 04, 2020 May 04, 2020

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...ooops, please excuse all the misspellings...

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Community Expert ,
May 04, 2020 May 04, 2020

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Digital images don't have physical dimensions, they only have pixel dimensions.

But they can have a ppi value (pixels per inch) that is used to calculate printed dimensions.

Pixel dimensions divided by ppi = printed dimensions in inches (multiply by 2.54 to get centimeters).

Photoshop will let you work with physical dimensions, it does the math for you. 

 

image.png

This is the Image size dialog for a 25 x 15 cm image at 300ppi.

 

image.png

If you change the ppi value to 200, the width and height increase to 37.5 x 22.5 cm.

So did you go to Image > Image size and change the ppi?

And what are the pixel dimensions of the image?

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Community Beginner ,
May 04, 2020 May 04, 2020

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Thank you for responding!

 

I understand I have'nt explained myself very well. 

My image setting is working well. When I produce images professiionally, resolution is always at least 300ppi, document size may vary. I seldom make my documents in pixels, as I mainly work towards printed results ( books, magazines) and make the documents in actual print size.

 

My rulers I use to make guidelines, where to put my bleedmarks or perhaps a logo etc. They have been working fine, showing the correct measurements in cm ( ad that is what I need them ti do, for 10 years. But now, after recent update, they seem to have been taking acid or something along those lines...

 

If my image is 25 cm long , image size will say 25 cm, if I print the image it will measure 25 cm. However, the rulers on my workspace will measure the image ie 36,75 cm long, or random. The problem is for me to set my guidelines, image itselfvis fine, really.

 

Hope this was better explained:)

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Community Beginner ,
May 04, 2020 May 04, 2020

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9450F022-7639-4D1E-B3F1-AB7E3A326E71.jpeg

 This is what I mean when mentioning rulers, not my image size dialog box 

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Community Expert ,
May 04, 2020 May 04, 2020

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Hello, they seem normal, can you show what they give on a 25 cm image, on the other end?

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Community Beginner ,
May 04, 2020 May 04, 2020

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I will do that, I will post this when back at my studio tomorrow👍



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Community Beginner ,
May 05, 2020 May 05, 2020

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Skjermbilde 2020-05-05 kl. 12.21.34.png

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Community Beginner ,
May 05, 2020 May 05, 2020

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Above screenshot of a file I´m working on. Image is 51 cm long, but my rulers tells me it´s 60,15ish wide. When I created the file a coupple of weeks ago (before all the updating), the rulers were agreeing with the dialog box for image size.

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Community Expert ,
May 05, 2020 May 05, 2020

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It looks like your rulers are set to pixels.

 

Still, I don't think you understand:

 

"I seldom make my documents in pixels, as I mainly work towards printed results"

 

You have no choice in the matter, you have to make your image in pixels. It's what Photoshop works with.

 

Physical print dimensions is a result of whatever you set as ppi value. This is arbitrary - you can set it to whatever you like, and nothing in the file changes. It just prints at different pixel densities, and thus different sizes. But the file is the same.

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Community Beginner ,
May 05, 2020 May 05, 2020

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Sorry, just bad at explaining myself. I do actually understand that photoshop images are pixel based - just tried to explain how I open new documents/define their image size according to the format destined for print... My clients will never order an illustration by pixel size - but by cm. They would actually have now idea what pixels are, well most of hem would not.

Never mind, problem is solved! 

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Community Expert ,
May 05, 2020 May 05, 2020

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You have the rulers set to pixels.

Right click the ruler and choose Centimeters.

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Community Beginner ,
May 05, 2020 May 05, 2020

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OMG Thank you! - feeeling the right idiot now...

 

 

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New Here ,
Feb 09, 2024 Feb 09, 2024

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Try changing your monitors screen resolution (110?). Fixed inaccurate rulers in acrobat. Restart photoshop to see if it worked.

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Community Expert ,
Feb 09, 2024 Feb 09, 2024

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LATEST

@MMP Oakdale you're replying to a 4-year old post that was previously resolved...

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