Unusual message

If you use File>Save for Web, that should get rid of any metadata that has the pixel aspect ratio info.

Yes, thanks Jeff and TSN. It's been so long since I've done anything with anamorphic video, I had totally forgotten that issue.

Oh, I like a challenge. I _think_ this is because the PNG has non-square pixels. (What is that? Well, imagine filling in a pattern on a huge brick wall. The bricks are wider than they are tall, so if you fill in pixel values from a normal image, it will be flattened - things will seem about twice as wide as they should be. Some TV monitors have non-square pixels).

The ppi value in the PNG file is horizontal - 26 ppi; vertical 20 ppi. The actual numbers aren't very important, but the fact that they aren't the same is important. I see three possibilities:

1. These values are somehow correct, and the image should be stretched to see it as it originally was.

2. Someone was setting up some hardware or software (perhaps a scanner) and had to type in the numbers for ppi; by error or misunderstanding these numbers were used.

3. The software making the file has a fault.

Anyway, if it looks OK, ignore the message.

It has to do with the Pixel Aspect Ratio being something other than Square.

https://helpx.adobe.com/photoshop/using/creating-images-video.html

this what the document looks like in photoshop with pixel aspect ratio correction turned on

photoshop elements turns pixel aspect ratio correction off

Well, I get the same message when I try to open the file.  Never seen this before and can't imagine what would cause it.

Hi Phinny.  Long time, no see.

And I don't think I have ever seen that message before.  What kind of file is it?  The message sounds like it is an interlaced file.  Can you upload it so we can take a look?  And what version of Elements and OS are you using?