Luminous Landscape Forum

Raw & Post Processing, Printing => Digital Image Processing => Topic started by: Nill Toulme on April 17, 2008, 08:01:54 pm

Title: Resolution loss with arbitrary rotation?
Post by: Nill Toulme on April 17, 2008, 08:01:54 pm: Is there a significant loss of resolution when applying arbitrary rotation to an image?

Nill
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www.toulme.net
Title: Resolution loss with arbitrary rotation?
Post by: dalethorn on April 17, 2008, 10:11:23 pm: Depends on the software. For arbitrary rotation and accurate (non-jagged) results, it takes a lot of CPU power, which in most cases today is not a problem. But some software and/or settings with very large images could take shortcuts and lose quality.
Title: Resolution loss with arbitrary rotation?
Post by: Richowens on April 17, 2008, 10:53:31 pm: None that I've noticed.

Rich
Title: Resolution loss with arbitrary rotation?
Post by: juicy on April 18, 2008, 09:22:01 am: Quote
Is there a significant loss of resolution when applying arbitrary rotation to an image?

Nill
~~
www.toulme.net
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Hi!
In PS the default method of interpolation (set in preferences, Bicubic sharper etc) has an effect on this. In any case there is allways a slight loss in quality when rotating arbitrarily or doing transforms such as perspective corrections in PS. This is seen to varying degrees as loss or softening of very fine details.
I usually make a very slight sharpening before such procedures and allways try to align the camera perfectly before taking the shot, especially in copy work.
Cheers,
J
Title: Resolution loss with arbitrary rotation?
Post by: Jonathan Wienke on April 18, 2008, 11:14:31 am: Quote
I usually make a very slight sharpening before such procedures and allways try to align the camera perfectly before taking the shot, especially in copy work.

For capturing flat documents and artwork, one helpful trick is to place a mirror where the artwork will go, and align the reflection of the lens to the exact center of the viewfinder. This will ensure you are perpendicular to the artwork or document. Then all you have to do is rotate the artwork to level and center it in the viewfinder.
Title: Resolution loss with arbitrary rotation?
Post by: Nill Toulme on April 18, 2008, 11:28:46 am: Thanks. I usually do it in the RAW conversion in C1.

Nill
~~
www.toulme.net
Title: Resolution loss with arbitrary rotation?
Post by: MichaelEzra on April 18, 2008, 04:50:52 pm: Silkypix does rotation without loss of resolution due to simultaneous enlargement of the file while rotating.