Upsizing test

Ok, it's pretty quiet here today, so I've done something I'd been thinking about for a while - an experiment with different methods of upsizing.

This is not a very scientific test, I must admit, but here's what I did:

I took a small section of a sharpish image - 150x200 pixels. This came from an 8MP camera, a bit of colour adjustment had been done, but no resizing of any sort.

I doubled its size (to 300x400px) using five different methods:

1. Just set the Crop Tool to 300x400 and cropped.
2. Image Size set to Bicubic
3. Image Size set to Bicubic Smoother
4. Image Size set to Bicubic Sharper
5. Image Size set to Bicubic Smoother, in 10% increments

Here are the results:

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I don't see much difference between V2-5. I do see a slight difference in v1.

eddarr wrote in post #5009485
I don't see much difference between V2-5. I do see a slight difference in v1.

ditto!

I think this shows there's very little difference between algorithms. If you'd used genuine fractals or some other software the results may be more interesting.

tim wrote in post #5009830
I think this shows there's very little difference between algorithms.

I absolutely agree. I was especially interested in the 10% method, as I feel kinda sorry for people who have been suckered into this timewasting technique.

Not really time wasting if you setup an action to do it for you.

Still takes longer than a plain resize or crop. I've never seen any advantage to it.

I don't have access to Genuine Fractals or anything else. I wanted to do the experiment using the tool that most people have.

Not that I do it anymore. But it used to have its advantages until it was fixed/improved.

this was very insightful..ty

I recently read a statement by Jeff Schewe that up to x2 the method of enlargement doesn't matter very much. Only above that do you see significant differences. Try again with x4 - the next time you are bored.

I will. And I'll use a better range of images.

They sem progressivelly sharper to me - in the exact progression from V1 to V5. But I wouldn't know which is which...