Change image aspect ratio in Photoshop

A tool you might find useful is Content Aware Scale (Shift Ctrl Alt C).  It allws you to stretch or compress an image while protecting selected areas within the image.  We could demonstrate better if you shared the image in question (you can paste directly to this thread).

The Crop tool has a number of presets that you can set to force the correct aspect ratio window when you drag across your image.  I'm guessing that 16:9 might be what you need for screen sizes like 1080p, 4K etc.  You'd still need to change Image size to the correct pixel size.

Hi Kevin,

As you want to change the aspect ratio of an image in Photoshop, you can do that by either cropping the image (however, that would remove some area from the image) Or by going to Image menu on the top and choose Canvas Size and enter the values that meet your desired aspect ratio.

Could you share a screenshot fo the image? It would be helpful for us to have a visual reference.

You may also check this community conversation and see if it helps: https://community.adobe.com/t5/photoshop/how-do-i-change-the-picture-size-and-the-aspect-ratio/td-p/9622703?page=1

Regards,
Sahil