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DPChallenge Forums >> Tips, Tricks, and Q&A >> Image Resize or Lesser ppi?
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 07/14/2006 03:24:14 AM · #1
I have a 3MP Canon S1 IS, that gives about 2100x1500 pixels. I want to get pictures for a book, which will print in about 14" x 10". This means that I can provide at most 150 ppi images.

The other option is that I can resize the images to say 4200x3000 in Adobe Photoshop, so as to make them 300 ppi (by progressive resizing).

Which option will give better results?
 07/14/2006 04:13:33 AM · #2
probably the resizing, but a program may work better than just step sizing.
 07/17/2006 12:55:27 AM · #3
Anyone else?
 07/17/2006 12:58:35 AM · #4
It's definitely a better idea to upsize them and then print at a higher DPI. It will yield much better image quality.
 07/19/2006 01:48:03 AM · #5
Originally posted by kyebosh:
probably the resizing, but a program may work better than just step sizing.


A program? Adobe Photoshop? Can you just elaborate??
 07/19/2006 01:59:13 AM · #6
It makes some difference how your are going to print this book, and what version of Photoshop you are using.

If you are printing with a photographic process (Fuji or Noritsu machines which print to photo paper in RGB) or a offset or inkjet process which will involve (eventual) conversion to CMYK.

If the former, you may not need to upsize from 150 dpi.

If you do upsize, and you have Photoshop CS or CS2, the currently-recommended procedure is it upsample in a single step using the Bicubic Smoother algorithm.
 07/19/2006 03:20:54 AM · #7
Originally posted by GeneralE:

If you do upsize, and you have Photoshop CS or CS2, the currently-recommended procedure is it upsample in a single step using the Bicubic Smoother algorithm.

But I have read in an earlier thread that step-sizing yields better results. Can you quote an authoritative source, as to which method is better?
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