I just got this chap back from the printers; an A2 test print of one of my neuroglyph manipulations.
It was scanned at 600 dpi from the A4 original. Photoshop fiddling was kept to a bare minimum (colour inversion, tone/vibrancy adjustment and some subtle layering) When converted to 300dpi and blown up it kept its detail and looks phenomenal at its new size!
First of a projected series of 10-15 A2 Giclée prints.