Resolution is the amount of detail in an image. It's measured by the number of dots (or pixels) per inch (DPI). Printing requires a higher resolution than viewing a photo on a computer monitor. For more information, see:
- Photoshop Elements Visual Dictionary: Resolution.
- About image size and resolution.
- About monitor resolution.
- Change print dimensions and resolution without resampling.
Resizing means changing a photo's print dimensions (the length and width). See Photoshop Elements Visual Dictionary: Resize.
To resample means to change the pixel dimensions of an image (by either adding or removing the total number of pixels). You resample primarily for onscreen viewing. Resampling always reduces image quality. Resampling to smaller dimensions reduces file size and sharpens appearance. Resampling to larger dimensions increases file size and blurs appearance.