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Question on upsizing in Photoshop

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ovbg:
Hello, I have PS CS1, and was wondering about the best upsizing method for Alamy. Would I be correct in using the standard menu option: "Image/Image Size", constrain proportons and Bicubic, and set the size to say 110%?

Thnaks.

rjmiz:
Yes, 10% at a time, and make sure you use "Bicubic  Smoother" in the drop down menus at the bottom.
I recommend Genuine Fractals, but making an action to increase the size 10% at a time, using "Bicubic  Smoother"
might be just the ticket as long as you don't upsize it too much ...maybe 2 times or 3.

Greg Boiarsky:
Actually, you don't need to resize in steps.  Since resizing involves interpolation, and interpolation involves error, you're compounding the interpolation error by adding in multiple steps.  That is, rather than adding a lot of error in once, you're adding a bit of error at each step, which then becomes compounded with the error introduced in the next step.  In the end, you find you've increased the error more by using a stepped algorhythm.  It's not typically a big difference, but in significant uprezzing, it might be visible.

Nonetheless, there likely isn't much of a difference between the two techniques in most situations.  So, doing the uprez in one step will save time.

I use Qimage for increasing file size.  It works very well, but others like Bob use Genuine Fractals to great advantage.

One last thing--it's vital that you not uprez a sharpened image.  It will look absolutely terrible.

Just my 2 cents worth--for what it's worth.


--- Quote from: rjmiz on March 31, 2007, 10:02 ---Yes, 10% at a time, and make sure you use "Bicubic  Smoother" in the drop down menus at the bottom.
I recommend Genuine Fractals, but making an action to increase the size 10% at a time, using "Bicubic  Smoother"
might be just the ticket as long as you don't upsize it too much ...maybe 2 times or 3.


--- End quote ---

Greg Boiarsky:
oops--hit the wrong stupid button.

madelaide:
On my few experiences with 50-100% upsizing, I asked a friend who has Genuine Fractals to use it so I could compared with other cheaper software. I was highly disappointed with it.  Maybe there are special adjustments that she doesn't master, but, comparing with other software, GF didn't bring as much detail.

In these experiments, originals were only 640x480 or 1280x960 pix images, so maybe results are much better with larger images.

If I need to make small upsizing (10-15%), I use PSP's "Smart size" (I don't use PS) with no visible loss of quality.

Regards,
Adelaide

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