Check image resolution
Photoshop; Finding an Image Center - SkillForge
Display resolution - Wikipedia
How to check for photo resolution?, Pixel v. Ink
Understanding Pixels, Resolution & Dots Per Inch (DPI)
How to Batch Resize Images on a Mac
Pictures too small when viewing - Apple Community
How to Resize a Photo on Mac
How to check the pixel size of photos (PC/Mac)
Solved: Increasing size of thumbnails for Mac? - Adobe Community