OPTICAL DENSITY of printed paper
Purpose of the test
This test is performed to determine the optical density, using a (spectro)densitometer, of a printed colour bar on paper.
Procedure
Operate the instrument in accordance with ISO 5-4 and the manufacturer’s instructions.
Leave the samples exposed for 24 h to 23°C and 50% R.H., according to ISO 187.
Adjust the (spectro)densitometer to the following settings: A-illuminant, Status E, polarizing.
Place the test piece in the position indicated on the cover sheet on a black backing.
Without touching the test area use the procedure appropriate to the instrument to obtain theoptical densities.
Report 4 measures of optical density per level, their mean and standard deviation calculated to 3 significant figures.
ISO 5-4
Nr. of samples
A pack made of a coloured cover and 2 printed papers
Each printed paper contains 2 strips with coloured scales
No special size
Levels
Level 1: Black 100%
Level 2: Cyan 100%
Level 3: Magenta 100%
Level 4: Yellow 100%
Density:
Level 1: 1÷2.5 (K)
Level 2: 1÷2 (C)
Level 3: 1÷2 (M)
Level 4: 1÷2 (Y)
Reporting
Report 4 measures of Optical Density per colour, their mean and their standard deviation. All to three significant digits.