On 12/30/2019 11:27 AM, Alan Goldhammer (Redacted sender agoldhammer for
DMARC) wrote:
I can only tell you what I have been doing. I have used this process for both
the Epson 3880 and Canon Pro-1000 using an i1Pro. I do a preliminary profile
using two letter size sheets (924 patches). I use this profile to then create
the final one. For the final profile I use four sheets (1848 patches). I
formerly added additional b/w patches using the '-g' command but have changed
this to adding neutral patches using the '-n' command that Graeme recently
added. I also bump up the emphasis on the neutral axis by changing the default
with '-N0.6' All patch sheets are read twice and averaged before generating
the profile.
I always use profcheck to examine the profile and pipe the data into an ExcelKind of what I have after pruning a few outliers (max. = 1.495734, avg. = 0.201568, RMS = 0.244810) and (max. = 13.985272, avg. = 0.224343, RMS = 0.514114) from original ti3 file.
spreadsheet to look for outliers. In my experience, I have not seen any
significant outliers and I've probably profiled 50 printer/paper combinations.
Smooth surface papers give lower errors than textured papers, perhaps because
of light scattering. Here are some representative results:
Moab Textured Rag: Max = 1.77; Avg = 0.28; RMS = 0.33
Moab Entrada: Max=1.36; Avg=0.25; RMS=0.29
Museo Silver Rag: Max=1.58; Avg=0.31; RMS=0.35
Museo Portfolio Rag: Max=1.21; Avg=0.23; RMS=0.26
I also print on Moab Juniper Rag, a baryta paper. I need to re-profile thisI use the same test image as you.
paper as Canon have added a new setting for baryta papers and I'm waiting for
the paper to arriver as it is back ordered.
I examine all the profiles for smoothness both graphically and using a standard
test image from Outback photo:
http://www.outbackphoto.com/printinginsights/pi049/essay.html as well as a ;
couple of demanding images of my own. I do all my soft proofing and printing
from Adobe Lightroom.
I can only say that this process works very well for me.
Alan