What are the ideal dimensions of a photo?

The jpg file (also called jpeg) is the most convenient type for storing and exchanging photos.
It offers excellent quality and at the same time a strong compression of the file size.
Other file types for images such as png, gif, ico, tiff, raw, psd, eps, bmp, can have advantages in particular cases and are sometimes used.
The jpg file however remains the most used for many years.


Often many people send by post several photos that have no reason to be so detailed, because they will be viewed only on screen.
Highly detailed photos may exceed even some MB size.
Generally, with a maximum of 200K in a jpg file you already get excellent results from a photo, if it does not have to be enlarged.

Sending photos that are too detailed means filling up your own mailbox and that of the recipient very quickly.
There are very simple and free programs to reduce the size of the photos.

The size of a photo is measured in KB.
1024 KB = 1 MB
The size of the photo increases if you increase the resolution and the amount of colours.


Photos with resolution from 70 to 100 dpi
The monitors have always had the resolution of 72 dpi for many years, the most modern monitors have 96 dpi, that is the number of pixels for each inch that make up the image.
This means that if we have to look at a picture only on the screen, generally it does not need to be very detailed.

Photos with high dpi.
PRO = can be printed on paper (300 dpi recommended)
PRO = can be enlarged in details
CONS = use more time to receive or send a file
CONS = it takes up a lot of memory space.