Correct screen selection is essential for interpretation of digital radiographs. Recommended screen format is summarised below:

19-inch or larger
resolution 1600 x 1200 @ 60 Hz, 24-bit colour (16.7M colours)
pixel pitch 0.27mm (H) x 0.27mm (V)
wide format preferred (WXGA)
contrast-ratio >600:1 (the basic determinant for discernability of anomalies).
Brightness > 200 cd/m2, Greyscale, µ = 2.2
coated-glass, resistant to scratching
cleaned regularly with approved solvent

Digital images of welds can be large files which require a high-specification computer to manipulate and analyse. The recommended configurations, depending upon usage, are given below:

Main Computer	Minimum	Preferred
Processor, clockspeed	Pentium IV, 1.4 GHz	Pentium IV, >3.3 GHz
Memory	1 MB DRAMMs	>2 MB DRAMMs
Operating system	Windows XP Professional
Communications	None	T3 network connection
Internal HDD	60 GB	2 x 200 GB serial ATA
Internal DVD	Combo CD-RW	DVD RW 24x
Power supply	350 W + supplementary cooling
Misc	Small-form factor preferred (eg Shuttle, Voodoo)
Input devices	Wireless keyboard/mouse, Griffin – PowerMate, Digitising tablet (optional)