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Resizing circle: strange results

Jul 31, 2012 2:50 PM

Hi,

 

I'm getting weird results after resizing a simple circular icon in Photoshop CS6 on Mac OS X 10.8.

 

I'm resizing from 128 px to 60 px.

 

The final icon is not totally circular: it has some excrescences on four sides.

 

Tried every possible resampling modes.

 

Resizing the sime icon in Preview gives perfect results.

 

Here's the examples:

 

Original icon: http://zevrix.com/_img-misc/tmp/bo-crcl-128.png

 

Resized in Photoshop: http://zevrix.com/_img-misc/tmp/boicon-60-phs.jpg

 

Resized in Preview: http://zevrix.com/_img-misc/tmp/of-icon-60.png

 

 

Any ideas why it happens?

 

Thanks for any help,

Leo

464 Views   7 Replies   Latest reply: leo.r, Aug 1, 2012 10:08 AM
 
Replies
  • Noel Carboni
    21,009 posts
    Dec 23, 2006
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    1. Noel Carboni,
    Jul 31, 2012 3:03 PM   in reply to leo.r
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    "Excrescences", eh?  I had to look that one up.  Thanks for teaching me a new word.

     

    Interesting.  I just opened your file, did Image - Image Size, 60px, and came up with this:

     

    ResizedIcon.png

     

    Do you have Photoshop set to the default resampling scheme?  I don't find that beneficial at all.

     

    Try changing Photoshop - Preferences - General, Image Interpolation to just plain Bicubic.

     

    BicubicInterpolation.png

     

    -Noel

     
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  • R_Kelly
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    2. R_Kelly,
    Jul 31, 2012 6:52 PM   in reply to leo.r
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    How are you resizing the icon?

    Using Image>resize , transform or.......?

     

    Do you have any layer styles on the layer?

     
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  • leo.r
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    3. leo.r,
    Jul 31, 2012 7:21 PM   in reply to leo.r
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    Thanks for all the replies!

     

    It made me look into the original image again.

     

    I found what was the problem, and R_Kelly poses the right question regarding the layer styles.

     

    The original image is actually PSD with the Drop Shadow layer effect applied.

     

    Once I rasterize the style, everything scales correctly.

     

    Thanks again,

    Leo

     
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  • R_Kelly
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    4. R_Kelly,
    Jul 31, 2012 7:28 PM   in reply to leo.r
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    If you use the Image>Image Resize dialog you can check the Scale Styles button.

    If you don't won't to flatten the effects and use transform, you can scale the styles manually after resize.

    Layer>Layer Style>Scale Effects.

     
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  • leo.r
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    5. leo.r,
    Aug 1, 2012 3:51 AM   in reply to R_Kelly
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    Thanks, I didn't know about Scale effects!

     

    In this case, Scale Styles was checked but apparently it doesn't do a

    good job here. Merging or style rasterizing isn't a problem in this case

    as the master image remains unchanged.

     

    Best,

    Leo

     
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  • conroy
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    6. conroy,
    Aug 1, 2012 9:19 AM   in reply to leo.r
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    Leo, many layer style effects parameters accept integer values only, so downscaling can ruin or eliminate the effect unless it is first rasterised.

     
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  • leo.r
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    7. leo.r,
    Aug 1, 2012 10:08 AM   in reply to conroy
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    Thanks - good to know the scientific explanation behind this!

     

    Leo

     
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