Richard Lewisohn wrote: > I would have thought that a more relevant 'real world' test would be to > see if it is better to 'upres' a 31MB 1Ds file so that it prints at > 30"x40" at 360dpi, or NOT to upres the file (as much or at all) and > print at 180dpi.
It depends on what you are testing. I would still start with the vector approach and find the optimal printer resolution (optimal being lowest possible with results comparable to higher res). If you know that, say 360 ppi offers the best possible printer resolution, Then you can try upressing (using whatever method) and compare that to not upressing and printing at 240 or 180 or whatever. But then you are testing whether up-ressing will introduce artifacts better or worse than when done within the Epson driver. > > In my (albeit limited) experience, the results have been better > printing a file with minimal increase to the size of the file at 240dip > or 180dpi than when 'blowing up' the image using stair interpolation to > the 'correct' size to allow it to be printed at 360dpi. I'd expect so. But in the past it has been prooved that, for instance, downsizing an image to 240 ppi on certain epson printers yielded better results than printing at 300 ppi. > > Surely any gain in image quality due to printing at 360dpi will be lost > in 'upresing' the original file. I tend to agree with that. Best Regards Thomas Holm / Pixl ApS - Photographer & Colour Management Consultant - Adobe Certified Training Provider in Photoshop� - Apple Solutions Expert - Colour Management - Imacon Authorized Scanner Training Facility - Remote Profiling Service (Output ICC profiles) - Seminars speaker and tutor on CM and Digital Imaging etc. - Home Page: www.pixl.dk � Email: th[AT]pixl.dk -- =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
