What’s the original size? 

I don’t know the details of PNG (i think it’s a wrapper around a lot of different compression techniques), but JPEG isn’t going to do much of anything if you just make it ‘high quality’ unless you’re dropping the resolution at the same time.

(JPEG slices the image up into squares, then saves the average color for each square in the top left corner, then how each pixel varies from the average… so you can at most get back a little better estimate of that top left pixel if you do some math to figure out what the missing pixel must’ve been to get the average pixel)

But the low/medium/high just affect what the size of the squares are that it chops the image into, and maybe how many bits it uses to track the color for the pixels.

So the only way to gain any significant improvement in the quality of the images is by reducing the image size, so there’s more information per pixel.

I would assume the same thing in PNG.

Some programs have ways to do smoothing when enlarging images, but that’s not adding any true information to the images.  (And this was recently an issue in a court case).

Depending on what you’re enlarging, the artifacts that get created can be rather significant.  To the order of triggering ‘Massive UFOs Orbiting the Sun’ headlines, and then when you replace them with the full resolution data, ‘NASA Covering Up Massive UFOs Orbiting the Sun’ headlines

(I wish I was kidding)

Oh, and ImageMagick can resize images.  There’s a Windows version, but I’ve never used it.

-Joe

Sent from a mobile device with a crappy on screen keyboard and obnoxious "autocorrect"

> On Dec 1, 2021, at 8:14 PM, charles meyer <[log in to unmask]> wrote:
> 
> Hi my esteemed listmates,
> 
> I need to take a graphic I download (with permission) off a Website and
> make it 1920x1080, or larger by the same ratio so its quality will be
> higher.
> 
> It would be even better if I could convert it into 3840x2160.
> 
> Has anyone used a FREE Windows tool to do that?
> 
> I understand Photoshop can do that but I don't have Photoshop so I need to
> accomplish this with something simpler like MS Paint.
> 
> Has anyone achieved these improved graphic results with MS Paint?
> 
> If so, could you pls share the steps?
> 
> I'm guessing it cna  be done in GIMP but GIMP can be at best challenging.
> 
> Thank you kindly.
> 
> Charles.