Lyson SG and profiles question- what is white?
2002-12-28 by Keith Cooper
Hello Normally, images I print do not have vast expanses of pure white, so I'd never noticed this before... For quickly printing some last minute B/W Christmas cards I took an image, resized it and pasted it onto an A4 size canvas (PS7 on a Mac, RGB image AdobeRGB space) This was to print out on A4 stock which could be folded to A5. I was able to add the requisite © and brief picture detail text to print the correct way up when folded. For a quick test I put in some ordinary paper and ran it through my 1160 at draft resolution -- using a Lyson profile. The printer seemed to be covering the whole paper. I checked and found a very sparse dot pattern covering the "white" parts. Just to be sure I printed a "pure white" square (~2cm square) in the middle of an A4 sheet -- it also had the faint dot pattern. The gist of this would be that the Lyson SG profile translates an rgb value of 255,255,255 into a very, very small amount of ink. I looked at the profile with iccToolbox and from my (rather limited) understanding of what I saw, this seems to be part of the profile. Can anyone shed any light on this for me?? I suppose it might be a way of getting a smoother top end (white) gradation on an image? Is it really important? or as I suspect, about as relevant as it is for everyday driving in knowing whether my car engine produces 195 or 200 bhp :-)) I ended up running the cards though the printer twice. I got a nice picture -and- pure white surrounding it bye for now Keith Cooper http://www.Northlight-images.co.uk Tel +44 (0)116 291 9092 Mobile +44 (0)780 162 9397