4800 grain versus 4000 problem

Walter_Kimmel · #15 06-03-2006, 08:24 AM

To my eye, this does not look like "grain" but like luminance noise that has inadvertantly been sharpened. Is it possible that somewhere in your workflow with the 4800 there is a default set to sharpen after uprezzing? It does not look as if it is caused by the printer, but by the software. What might bother me more is the difference in color cast and saturation between the two prints, and compared with the original file.

Rob_Ganzeveld · #16 06-05-2006, 10:30 AM

I think Walter is right on the money and that it is luminance noise. When I upgraded to Canons new version of DPP I ran into this exact issue. I turned on the luminance noise reduction to high and the issue is gone.The default setting is none. At first I thought it was my 7800 but I processed images that never had a issue until the upgrade and I knew right away it was my software.
If it shows up on the monitor then it is a software issue and not a printer issue.
Rob

DonLashier · #17 06-05-2006, 03:39 PM

> think Walter is right on the money and that it is luminance noise

Except that that image is one of the classic samples and I assumed that the source of both print (scans) was the same image just output on different devices - but still perhaps a software (profile) issue?

- DL

Mark_Segal · #18 07-11-2006, 08:40 AM

I think the actual file is also over-sharpened; this will exaggerate any noise that becomes more visible with unnaturally large blow-ups. I used the 4000, am now using a 4800, and I simply have not experienced this problem - even on A3 prints made from half the file of a Canon 1Ds image, seen under normal D50 viewing conditions.