Resolution loss with arbitrary rotation?

[Nill Toulme]

Is there a significant loss of resolution when applying arbitrary rotation to an image?

Nill
~~
www.toulme.net

[dalethorn]

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.

[Richowens]

None that I've noticed.

 Rich

[juicy]

Is there a significant loss of resolution when applying arbitrary rotation to an image?

Nill
~~
www.toulme.net
[a href=\"index.php?act=findpost&pid=190280\"][{POST_SNAPBACK}][/a]

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

[Jonathan Wienke]

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.

[Nill Toulme]

Thanks.  I usually do it in the RAW conversion in C1.

Nill
~~
www.toulme.net

[MichaelEzra]

Silkypix does rotation without loss of resolution due to simultaneous enlargement of the file while rotating.