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Graphics.com has a good article on Digital Image Enlargement Tools:
'If you want to create prints with resolutions larger than that of your digital camera, you could leave the job of digitally enlarging the photos to the printer driver. But in that case you can not be sure of the quality of the prints. Many graphics applications offer an Image Size or Resize feature for enlarging images, but if higher quality is your concern, you should look further. Especially if you want to do relatively large prints, it is essential to use a special tool to produce high quality enlargements. Before taking a look at some of the various tools available, it's worth taking a quick look at how the image sizing features in some graphic applications compare.Photoshop's Bicubic option is fine for upsizing images up to 200%. The new Bicubic Smooth option in Photoshop CS is even better for bigger enlargements. Unfortunately, Paint Shop Pro (up to the current Version 9.0) produces blocky results when upsizing images, because it offers no real bicubic method. So better to only use its Resize tool for downsizing images. PhotoImpact, on the other hand, offers a true Bicubic resize option which looks better than Photoshop's Bicubic method, but not quite as smooth as Photoshop CS's new Bicubic Smooth option. Finally, the popular freeware IrfanView (Version 3.92) offers a Lanczos resizing option which uses too few sample points and therefore can produce an unwanted shadow pattern in some images. So it is better to use the Bell or Mitchell option, which are comparable to Photoshop's Bicubic Smooth option....'
Read more at Digital Image Enlargement Tools.
Posted by Darren in our Tips category on November 22, 2004