What does '60L/40%' mean?

This number tells you how many dots there are lined up per inch of screen tone pattern, 

　

ie: 30L=30dots lined up per inch. 40=40dots lined up per inch and so on.

Therefore the higher the number of dots, the greater the density and the heavier the effect of the tone.

　

You will also notice a percentage is given.

This tells you what percentage of a given area is taken up by dots.

　

ie: if it is 40% then, in a given area, the dots if gathered together would fill 40% of that area.

    (*Line density is indicated by line thickness.  ie: 'mm')

A simple rule of thumb:     The higher the percentage, the higher the density.

　

N.B.

The 'L' numbers are particularly important when mixing tones.

Always mix tones with the same 'L' number.

　

eg: 30L with 30L.  NOT 30L with 50L, otherwise this will result in a Moiré effect (criss-cross pattern).

　

The percentages can be mixed freely.

eg: 30L/20% with 30L/40%

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