On 6/7/19 2:16 PM, Paul wrote:
Ken Springer wrote:
On 6/6/19 3:25 PM, Ken Springer wrote:
Does anyone know the underlying mathematical formula used in this
webpage?

https://andrew.hedges.name/experiments/aspect_ratio/

I'm afraid my algebraic skills have dwindled to almost nil in the 65
years since high school algebra! LOL

OK, this is a new subthread, I don't want to derail any of the others.

It has been completely unintentional, but this problem has turned into
an interesting observation of reading comprehension, and people's
tendency to follow the thought processes of those before them.

I thought, for a moment, that nospam and Ammammata were going to head
off in the right direction. That direction is...

To ask me why I need the formula! LOL

Everyone assumed I wanted to do something with a photo. I suspect that
is a result of the aspect ration calculation pages I looked at all used
photos as an example in one way or another. But that's not the purpose.

And, I didn't say a darned thing about photos! VBG

And, by golly, before I could get this posted, it looks like Char
Jackson has the answer!

I'm looking at the aspect ratios of various screen resolutions. So far
I've located 48. If you want to see a couple oddball resolutions,
replace your monitor's driver with MS's Generic PNP Monitor driver. I
don't think all of the resolutions are for monitors, new or old, but I
don't know that either.

As we all get older, most of us begin having visual issues. :-( I'm
looking for a solution to help that without having to install any
additional software or purchase additional hardware.

I need the formula so I can plug it into a cell in a spreadsheet.
Scripts and such isn't the answer, as the final spreadsheet file needs
to be generic enough to even work in Numbers on a Mac.

Although, it doesn't need to work in VisiCalc. LOL


OK, give us an example test case with numbers, as to
how you would go about doing this.

Would you rephrase? I'm not exactly sure what you're asking for.0

LCDs work best at native resolution.

They do, no argument about that. But, if you can't read the screen at
native resolution, you don't give a damn if it's native resolution or not.

I would not be
thinking about "aspect ratio" with an LCD monitor, because
good options are pretty limited.

True. And with what I've seen, your options, at least in Windows with a
correct monitor driver are limited to a few resolutions, although I know
not how the driver programmers come up with those numbers. Logically,
you might see just resolution options that match your monitor. That
appears to not be true, as I have 2 resolutions listed that do not match
the aspect ration of the monitor. 1, however, matches the native
resolution of a video projector I own, but it has never been connected
to the computer.

You can change the OS
"Percentage scale" option to affect font choices, to
improve things if your vision is slipping. That doesn't
require maths, just a mouse.

And, what if that's not good enough?

This project does not affect me, for now, but I do know a lady for whom
it is an issue. I've done just about everything I can for her, but to
do any more she needs a bigger monitor.

And, she still uses a magnifying glass. :-(

Pan mode has been broken by WDDM "improvements'. So it
can't be that. It might work with XDDM.

By "pan mode", are you talking about the really old idea of virtual
desktops where the desktop is actually larger than the monitor, and you
move it around to see the area you want?

If so, I hope they never come back. LOL

What else is there ?

Why do you think we went looking for Image aspect ratio
as a first guess ? Because aspect ratio doesn't do you
a darn bit of good.

That's because no one bothered to ask me what I was doing. And for what
I'm doing, it *does* do a bit of good.

You preserve aspect ratio choices on a CRT (which can
handle multiple resolutions without looking crappy),
in order to keep circles looking like circles (rather than
ellipses). So that's the reason there. You can hardly
"hammer" a CRT and perform miracles. Reducing the
resolution too much, causes the user to use the
scroll bars too much, when doing MSWord. That would
not exactly be satisfactory.

I know. I've got a 19" CRT on my Vista system using 1152X864 for the
screen resolution. 4:3 aspect. Gorgeous picture. I sometimes use it
for playing an old color movie before there was widescreen in the theaters/

So give us a worked example, of how knowing an aspect
ratio, will improve your life.

Is this similar to your question at the beginning?


--
Ken
MacOS 10.14.5
Firefox 67.0
Thunderbird 60.7
"My brain is like lightning, a quick flash
and it's gone!"