On 11/14/2015 10:54 PM, Stan Brown wrote:
I have an Asus Zenbook laptop, running Windows
8.1. Screen resolution is set to 1920x1080,
which is the recommended size. There's no
external monitor, and I've never connected
one.

But programs are not seeing that resolution.
For example, I used a test image in Irfanview,
and a 1280x720 image took up the whole screen
exactly. (Irfanview is set to show images at
100%.) I don't have Magnifier running, or
anything like that.

It took me a while to recognize this, because
the screen looks really sharp and crisp, but
as far as I know it's been this way since I
got this laptop

When I maximize a window, it takes the visible
screen and doesn't overflow past the screen
limits.

This is Windows 8.1. Intel HD Graphics 5300.
When I bring up Intel HD Graphics in Control
Panel, display settings are Basic and
Advanced, but when I click Advanced it says
this display doesn't support any advanced
settings.

In Device Manager, the laptop's monitor is
listed as "Generic PnP Monitor".

I googled for this, but all I found was advice
to right-click the desktop and select screen
resolution. My screen resolution is correct.
Out of desperation, I tried setting it down to
1600x900 and then up to 2910x1080 again, but
that didn't help.

If anyone can shed any light, I'll be
grateful.

The relationship between screen resolution and displaying images in an
application is indirect and may not necessarily have a 1:1 pixel count.
Since your Windows screen resolution is set correctly, it is reasonable
to assume that the settings in the app are causing the variance you see.
As Wolf points out, if you display that image at 100%, it should not
take up the entire screen. OTOH, if your settings in the app "optimize"
the display of the image to fit the screen, there's no telling what the
actual image/pixel relationship might be without a calculator. I
wouldn't worry about it, unless you are trying to achieve a specific
pixel size for the image.

--
Best regards,

Neil