When to use Increase Image Size (Enlarge Image)
Enlarge an image to 150%, 200% or any size with high-quality smoothing. Useful for small photos that must meet a minimum pixel size.
The best image settings depend on where the picture will be used. Pixel dimensions describe width and height; file size describes bytes. Changing one does not guarantee a particular value for the other. Keep the original, compare the result at its intended size, and choose a format accepted by the destination.