Zoom 100% (CTRL+1) does not fit

[Phileas]

In the zoom level 100% (CTRL+1), the display on the screen should be just as large as when printed out. Unfortunately, this is not the case with me. I have to set the zoom to 52% so that 21 cm on the screen is actually 21 cm.
I find this function important to control the design.

Is there an adjustment for this?

In der Zoomstufe 100% (STRG+1) sollte die Darstellung auf dem Bildschirm genauso groß sein, wie ausgedruckt. Das ist bei mir leider nicht. Ich muss den Zoom auf 52 % setzen, damit 21 cm auf dem Bildschirm auch tatsächlich 21 cm sind.
Ich finde diese Funktion wichtig, um das Design zu kontrollieren.

Gibt es da eine Einstellung?

[walt.farrell]

What OS do you use?

What Display Scaling value are you using? Do you have multiple monitors?

What document DPI do you use?

Can you share a sample document that has this problem?

[Pšenda]

Zoom 100% is pixel from document to screen pixel. Try Actual size (Ctrl+8).

[walt.farrell]

1 minute ago, Pšenda said:

Try Actual size (Ctrl+8).

I forget about that distinction sometimes  

[carl123]

28 minutes ago, N.P.M. said:

To me these are both the same but I have my scaling set to 100%

Try a document set to 300DPI

[Phileas]

Oh, sure: I forgot some important informations.

I use Windows 11 on a laptop with an external monitor.
The resolution of the document in dpi does not change the fact that the document is displayed too large on the screen. The phenomenon occurs with all documents in Affinity and also with CTRL+8. CTRL+1 and +8 give the same result: zoom to 100% and the document is displayed too large.
In the Windows settings, the screen is scaled to 150%. I use a second laptop where the phenomenon does not occur, although the same monitor (!) is also controlled with 150 % scaling.

Translated with www.DeepL.com/Translator (free version)

[henryanthony]

@Phileas I don't understand your statement: "In the zoom level 100% (CTRL+1), the display on the screen should be just as large as when printed out.

I have a document I am working on. It is 11" x 11" 300 dpi. When I choose to print to my laser printer, I am shown a preview of an 8 1/2 x  11" page that extends fully from the top of the page to the bottom and because the document is 11" wide and the page size is 8 1/2", it shows overlap at the sides. Then I can scale the print size within the print dialog to what ever I want.

This is true no matter the zoom level. If what you say is true, my print would be 33" x 33".

[walt.farrell]

44 minutes ago, henryanthony said:

I don't understand your statement: "In the zoom level 100% (CTRL+1), the display on the screen should be just as large as when printed out.

I believe they are saying that when they are looking at the document window (not the Print dialog), that they expect to be able to hold a ruler to the screen, and for either 100% or Actual Size they expect the measured size to match the document size.

And that is true for me, when I use Ctrl+8 (Actual Size). Here's a screenshot from my laptop screen, of a 4in x 6in document. Both the ruler, and the measured size on-screen, are correct. It's 4 inches wide as I view it.

 

[Phileas]

Oh, I see. Have a look on the screen-shot:

The ruler in my hand does not fit the ruler in the app, but it should.

[walt.farrell]

24 minutes ago, Phileas said:

The ruler in my hand does not fit the ruler in the app, but it should.

I am not sure it should at 100% (as mentioned earlier).

For my screenshot, where it does match at "Actual Size" (Ctrl+8) the zoom value shown in the document tab is 47.3%):

[henryanthony]

Regarding actual ruler measurements, on my 17" laptop I need to set zoom to 130%. On the 22" desktop zoom is 90% to get actual ruler measurement. This may have to be a manual adjustment because I don't think it is possible to make a macro to set this or an API/SDK to make changes to the program.

Size measured is dependent on screen pixel density. I guess  you could play with this in Display Settings to make 100% equal to what you want to see at a specific zoom settings but you may be losing display quality. Circles may not be circular, some fine lines may disappear, text could be a problem and other possible anomalies. I just use the recommended display size.

 

[Old Bruce]

Try setting the on screen rulers (the units of measurements) to Pixels.

[debraspicher]

5 hours ago, Phileas said:

Oh, I see. Have a look on the screen-shot:

The ruler in my hand does not fit the ruler in the app, but it should.

It won't fit at 100% zoom (that's per your screen resolution). You have to use Ctrl + 8 (Actual Size) as @walt.farrell says to match monitor PPI.

I've yet to have a screen not match at that view. Which is kind of crazy, but I guess Affinity has a way to grab PPI info at the hardware level. In CSP, we have to hold a ruler against the screen (fun) and adjust a slider until it fits for "Print View" (same in this case) to be accurate.

Edit: For informational purposes only, this is how Clip Studio (CSP) manages "Print View". It requires going into the application settings and laying a ruler up against to the screen and manually adjusting. Whereas in Affinity this isn't necessary. (In Affinity's case, "Print View" is called "Actual View")

[walt.farrell]

9 minutes ago, N.P.M. said:

The OP used cm in his first post.
So IOW he used the wrong units to match.

 

Sorry; I don't understand that comment. The units shouldn't matter.

[walt.farrell]

1 minute ago, N.P.M. said:

How not?
Care to explain why 300dpi in pixels are not the same in mm and why the zoom acts different when the units are different.

I wasn't the one who suggested you try at 300 DPI. I don't know that the zoom acts different when the units are different.

My "Actual Size" zoom is fine in inches, and (as far as I can tell without a ruler marked in cm) it's fine (accurate) in cm, too.

Why do you say the OP used the wrong units?

 

[carl123]

7 hours ago, N.P.M. said:

How not?
Care to explain why 300dpi in pixels are not the same in mm and why the zoom acts different when the units are different?

When I suggested trying 300DPI I was using pixels and that does give a different zoom for CTRL+1 and CTRL+8

But not for mm, etc

There is another "complicated" thread below with a similar issue to which a fix was announced yesterday for the next beta release, so hopefully this particular issue will be resolved in Publisher shortly

 

[lepr]

8 hours ago, walt.farrell said:

I don't know that the zoom acts different when the units are different.

Affinity 1.10.6, 2.0.4 and beta 2.1.0.1713 on macOS

AP: zoom percentage is always pixel-based, regardless of document units being pixels or physical

AD & APub: zoom percentage is pixel-based when document units is pixels and physical-based when units is physical

 

[Phileas]

In InDesign and other apps I get the actual size by pressing STRG+1. And for me this is a function I ofte use to check the design.