How do I change the picture size and the aspect ratio??

dtwo@centurylink.net  wrote The picture I have is 2560 x 1920.  It has a DPI of 72 and a aspect ratio of 1.333. The picture needs to be 1440 x 1080 with an aspect ratio of 1.000.

This is a clue. Normally, a picture with an aspect ratio of 1.000 must have the same number of horizontal and vertical pixels, like 1440 x 1440. There might be some confusion here between the image aspect ratio and the pixel aspect ratio. It sounds like the picture might need to be set up for a Premiere Pro timeline using a 1.333 pixel aspect ratio, which is used by some video formats. But by default, Photoshop is going to use a 1.0 pixel aspect ratio.

I'm a little fuzzy on the exact solution to this, but it probably involves properly setting up the View > Pixel Aspect Ratio submenu and the View > Pixel Aspect Ratio Correction command.

Try this...

1. Open your 2560 x 1920 px image. My guess is that if you look in the View menu, View > Pixel Aspect Ratio is set to 1.33, and View > Pixel Aspect Ratio Correction is on.
2. Choose View > Pixel Aspect Ratio > Square. This sets the Pixel Aspect Ratio to 1:1, and that makes the image look less wide.
3. Choose Image > Image Size. It still says 2560 x 1920 px because no pixels were removed or added, only their aspect ratio was changed.
4. Change the Width from 2560 to 1440. This should also change the Height to 1080, so now you should be done.

If this really is just a pixel aspect ratio problem, cropping should not be used to solve this unless you actually want to clip out part of the picture. But if you did use the Crop tool, you can crop just one side by dragging a middle handle (not a corner handle), but that only works when the Crop tool is not set to a specific aspect ratio. Because when you tell Photoshop you want to crop to a specific aspect ratio, maintaining that aspect ratio requires that both dimensions be cropped by the same amount. That would not be possible if you cropped just one dimension.

dtwo@centurylink.net  wrote and not by one side at a time like LightRoom

Lightroom works the same as Photoshop, but uses different controls. If the lock icon in the Lightroom crop tool is open, it is not locked to a specific aspect ratio so you can crop height and width independently. But if the lock icon is closed, that locks the aspect ratio and so Lightroom will crop height and width together.