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What is the best way to enlarge a high resolution digital photograph?
I shot in RAW format with a 10.1megapixil camera and I am trying to enlarge the photographs to 16X16 inches. What is the best way to do this to get the least amount of pixilation? I have photoshop CS2 and I have tried simply resizing using bicubic resampling but I get a lot of pixilation. The photographs have a lot of intricate detail and I need them to be sharp but not pixilated. Any suggestions? I have a Nikon D200 camera
Photography - 2 Answers - 2008-02-20 10:17:06

Best Answer
You have already done what you need to do. Just convert your images to TIFF and then crop them to the 16x16 size. Send them to your lab and they should be spectacular. I am going to test your process now and see if I can see what the problem may be. I guess I need to ask what size your sensor is. Some bridge cameras have small sensors (MP is only half the equation for capturing high resolution images). EDIT: I just used your process to create a 16x16 inch (@300DPI) image file as a TIFF from a RAW file from a smaller 6MP sensor on a DSLR ... no pixelation. Then using the same RAW file, created a JPEG with the high resolution (12) setting, cropped to 16x16 and viewed it at 100% .. again no pixelation. The JPEG was saved using progressive (3) resampling

All Answers
Answer 1
You have already done what you need to do. Just convert your images to TIFF and then crop them to the 16x16 size. Send them to your lab and they should be spectacular. I am going to test your process now and see if I can see what the problem may be. I guess I need to ask what size your sensor is. Some bridge cameras have small sensors (MP is only half the equation for capturing high resolution images). EDIT: I just used your process to create a 16x16 inch (@300DPI) image file as a TIFF from a RAW file from a smaller 6MP sensor on a DSLR ... no pixelation. Then using the same RAW file, created a JPEG with the high resolution (12) setting, cropped to 16x16 and viewed it at 100% .. again no pixelation. The JPEG was saved using progressive (3) resampling
2008-02-20 10:26:58

Answer 2
Photoshop CS3 has a better upsizing algorithm than CS2 had. CS3 provides great results by simply resizing once using Bicubic Smoother. In CS2 you can upsize several times increasing the size by about 10% each time until you get to the size you need. Remember, the more you upsize the more degraded the image will be. Another option is a software package called Genuine Fractals by onOne Software (http://www.ononesoftware.com/detail.php?prodLine_id=2). I’ve never used it but many people swear by it. You do need to up sample your image to get the size you want at the resolution your printer will need (usually 300 ppi or if you’re printing to an inkjet 240 is usually OK). You should check with your lab or your printer documentation for the required resolution. With a 10.1 megapixel camera your RAW file should be about 3900 x 2600 pixels. At 300 ppi that gives you a print size of 13” x 8 2/3 β€œ. To get a 16” x 16” print you will of course have to crop away a good portion of the image. To get a 16” x 16” print at 300 ppi you will need to upsize the cropped portion of the image to 4800 x 4800 pixels (16” x 300 ppi = 4800 pixels). Remember, while up sampling use the Bicubic Smoother option. For future reference if you down sample an image you should use Bicubic Sharper. Hope this helps.
2008-02-20 11:22:27