A picture allows you to define how you want values in a unit of measure to be shown to you. This applies when you see them on the screen and when they are printed in your documents. A picture is associated with every unit of measure, so they can be shown to you in a form that is appropriate to the value.
The picture includes settings for:
•representing negative numbers, for example: £(100) or £-100 or £100
•showing, or not, leading zeroes, for example: 1 or 0001
•the number of decimal places, for example: 1.0 or 1.00 or 1.001
•the unit symbol, for example: 1Kg, 1Mtr, 1Sec.
and others.
It's important to realise that the way the unit of measure values are shown to you is totally independent of the way they are stored internally. You will not damage you measures by setting an inappropriate picture. If a measure cannot be expressed properly in the picture you have set it will be shown as #### instead. Just change the picture as necessary and the value that was previously shown as #### will be shown correctly.