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Keep one thing in mind...
As a college adult continuing education instructor who teaches image editing, I advise most readers here to be appreciative of the gift they have to comprehend the powers of Photoshop and image editing far beyond the scope of the average digital photography shooters. In other words, exercise your style, class and maturity and be charitable towards those less gifted than you.
Georges' article is for those people who are frustrated when they see the disparity of image transmitted on their computer monitor versus that which is translated by reflective paper surface. He provides a first option solution. Of course, as WE know, there are many more, enhanced options to improved image resizing and improvement. Let the amateurs start with Georges and then, if so inclined, progress on their own to a higher Photoshop level. Hey! This is America, home of the Capitalist entrepreneur; so let Georges market his book.
extra tip author missed
While its true that Photoshop's algorithms have gotten better, there is one helpful hint that would have made the authors article stronger.
I learned at the recent photoshop world orlando, that increasing the image in 110% increments yields the best up-sampling results. For some reason 110% is the "golden number" when taking advantage of photoshops new algorithms. We've tried this and have found it to give good results ourselves. (For example, if I want up-sample an image 300%, I'd up-sample it three times in 110% increments, giving me a total up-sampling of 320%, but yielding better results than doing a straight 300% up-sampling) Also, According Vincent Versacae, he recommends you try both the bicubic smoother AND the bicubic sharper selection. While adobe recommends the bicubic smoother, it makes more logical sense to want to sharpen any image you up-sample. He says to try both and make your own decision on the matter.
This article
This is waste of time to read his article. Who doesn't know how to upsize files in CS? The author is trying to lead you into his publication.
I print large prints from small files everyday. I even enlarge a file right off the internet from a 5"x7" 150 dpi to 48"x60" at 200 dpi (after cropping) to frame and hanging up in the middle of my livingroom. By using just PS CS2 is NOT enough, trust me. I own and have tested Photoshop CS2, Practals Pro 4.1, SizeFixer SLR and PhotoZoom Pro 2.1.10 and I found PhotoZoom Pro is the most acceptable to upsample photo files.
All the above software that I own are not cheap for most people. There is another way that you may try to help out the quality of your upszing is to convert you original file to PDF file before doing any editing or upsizing. PDF file seems to hold way better quality than try to work from JPG file when you try to upsize the file. Give it a try. You have nothing to lose. You may contact me at mac_mail_reply@yahoo.ca if you want samples (send a file along) or info. I don't charge.
Good luck and have fun!
Much ado about nothing
Rather disappointed with this article. Essentially it's four, wordy pages that make only one simple point: Use Photoshop's "bicubic smoother" algorithm to scale up an image.
Too general without getting the best results
The general method will work somewhat for many images but will never give you the best results. For an amature photographer it may be OK but not sutable for saleable work. Qimage sharpening seems to work better most of the time. It sharpens just prior to printing to the native resolution of the printer. View the image at full size on screen for final sharpening and viewing. Much depends on the subject matter.