Display scalling in windows 10

[Adelin]

Hello,

I post here about display scaling.
I dunno if i understand it well, but display scaling setting is a percentage of 96 dpi ?

I have a 1920x1080 24" 23.8" effective view.
I know i can't go lower than 96dpi (100% scaling) even by hacking keys in regedit.
True scaling should be set between 96% and 97% if i wanna have a 1:1 ratio.
microsoft paint Show 96 dpi curently as it's the lowest it can get, even hacking keys in regedit to lower setting won't work.

I display an a4 paper size (29.7cm x 21cm) and if i use a paper against the display it doesn't match.

Off course, i can use paint built in rescaller, and set it to 96% or 97% and an A4 paper will fit almost perfectly so i can draw 1:1 real size objects.

It's possible to do things different, and set display to 2560x1440 with AMD.
Virtual dpi would be 123dpi if i remember, setting scalling to 128 in windows parameters instead of 125% recommended setting:

An a4 paper fit perfectly Paint, with 100% scale (no rescaling) and ppi properties is 123

I would like to know what is better:

1920x1080 97% scale of A4 in paint
or 2560 x 1440 100% scale in paint 128% scale of 96 dpi in windows display settings ?


I have a question, does low dpi display, scale well in windows 10 ?
if 96 dpi is a minimum to use scaling ?

Does other ways exist, like better using of metric system for dpi and resolution ?
Sorry i'm novice, and don't understand math well, it's just i ttyed my best to find a way to display an object true size in paint with A4 29.7cm x 21cm setting in paint.

And sorry again, my post is confusing :)

[Revelene]

There isn't a minimum to use scaling, as far as I know. Window's scaling purpose is to increase size, not the other way around.

If you lower your scaling, you'd essentially be lowering the resolution. So, why don't you just lower the resolution?

Though, I'm not sure why you want your entire Windows to be scaled to a piece of paper. If you just want paint to be scaled to it, or a specific application, then just use the in app scale settings.

[Seven7]

all display matrix have different phisical dpi, you never get 100% same as on preprint - phisical printing devices also have different lpi

[Adelin]

Hello, it's just i would like to reflect display as a 1920x1080 92.56 PPP in windows if i set it to 1920x1080, but windows is set at 96 dpi curently even if i try to change settings in regedit to set it as a 93ppp display.

One thing i may have understood wrongly is Windows has no scale problems with eveyrthing above or equal to 96PPP.

Actually if i had a 23.8" display with true 2560x1440 resolution and 123 dpi, i would not have to rescale it, 100% scale would show as 123 dpi in regedit, right ?

[Revelene]

Αναρτήθηκε αρχικά από Adelin:

Hello, it's just i would like to reflect display as a 1920x1080 92.56 PPP in windows if i set it to 1920x1080, but windows is set at 96 dpi curently even if i try to change settings in regedit to set it as a 93ppp display.

One thing i may have understood wrongly is Windows has no scale problems with eveyrthing above or equal to 96PPP.

Your scaling at 100 percent is the native amount of pixels per inch, 1:1 scaling to your monitor.

If you want lower, then what you are essentially wanting is a lower resolution.

[Revelene]

Αναρτήθηκε αρχικά από Adelin:

Actually if i had a 23.8" display with true 2560x1440 resolution and 123 dpi, i would not have to rescale it, 100% scale would show as 123 dpi in regedit, right ?

What exactly are you even trying to achieve?

[Adelin]

Ok forgive everything i sayd, i was thinking about a zoom lvl with custom setting in paint, not resizing, as it change my A4 paper in paint to another ratio.

Zoom in paint is 50% 100% 12,5% so i_ need to use another drawing program to have the right zoom or dpi under 96 i don't need to zoom in paint if i set my display to 2560x1440 with 128% scale in windows display settings, and 1cm is really 1cm with small margin error.

but it's not possible to scale under 96 dpi, so i ahve to use a programe that has a zoom i can increase by one percent not 50 or 10%

Ok it's not clear in my brain, so my post won't be nice to view for you sorry again :)

[Revelene]

Αναρτήθηκε αρχικά από Adelin:

Ok forgive everything i sayd, i was thinking about a zoom lvl with custom setting in paint, not resizing, as it change my A4 paper in paint to another ratio.

Zoom in paint is 50% 100% 12,5% so i_ need to use another drawing program to have the right zoom or dpi under 96 i don't need to zoom in paint if i set my display to 2560x1440 with 128% scale in windows display settings, and 1cm is really 1cm with small margin error.

but it's not possible to scale under 96 dpi, so i ahve to use a programe that has a zoom i can increase by one percent not 50 or 10%

Ok it's not clear in my brain, so my post won't be nice to view for you sorry again :)

If setting your resolution to 2560x1440, and setting a custom scale of 128 percent, allows you to do what you wanted... then I think you have found the solution to your problem.

As far as another solution, I don't believe there is.

[Adelin]

Thanks a lot Revelene,

I found an article explaining for newbe like me few things, and an interesting comment:

https://blogs.msdn.microsoft.com/fontblog/2005/11/08/where-does-96-dpi-come-from-in-windows/

2. One of the reasons for not supporting lower pixel densities is because the fonts in the system are tuned for a minimum of 96 PPI, and though they work at smaller sizes, they will not be optimal.


Somewhere else, i can't find the source, but a comment was meaning something like:

You would have difficulty to draw a line under 1 pixel large a 0.6 pixel line would not fit well, and he sayd it's easier to scale positive ratio one pixel than negative

I dunno if it was related to 96 dpi in windows still.

[Seven7]

maybe you will use another 2d editor with smooze scaling?

[Adelin]

I found in GIMP it can set custom zoom lvl, (i don't wanna rescale to preserve ratio)

Other

This command brings up a dialog which allows you to choose any zoom level you would like, within the range of 1:256 (0.39%) to 256:1 (25600%).

In firefox i had in about config to change the zoom lvl to 97 % as it increase only by 10%

It's not uncommon apps not having custom zoom or increase by 1% or lower

I think everything is more clear to me from now :)

edit again:

I found a very bery interesting website:

https://oliversturm.com/2010/09/02/the-crime-that-is-windows-dpi-handling/

Not the best quote but it's one of the thing i noticed:

"More important is something else though: Windows enforces a particular range of DPI values. The 100% item in the dialogs shown above is the minimum value you can enter. Remember my 28 inch screens I described above? They have a DPI of 82. It’s impossible to configure Windows to this value. Why? Brilliant, just brilliant."

I think this website explain every questions i had :)

About history of 96dpi:

https://blogs.msdn.microsoft.com/fontblog/2005/11/08/where-does-96-dpi-come-from-in-windows/

“The Windows solution was somewhat controversial. The decision was made to report the resolution of displays on Windows as about 1/3 greater than actual resolution. This roughly corresponds to the increased reading distance. So, for displays around 72 PPI, Windows would indicate 96 PPI. ”