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C
chet_60
Known Participant
August 10, 2020
Question

selections in image use anti-aliasing mode when resizing - how to stop that

  • August 10, 2020
  • 2 replies
  • 1987 views

using properties panel to change the dimensions of either a pixel layer or selection causes the selection to use anti-aliasing mode. Imagine a filled rectangle- dimensions changed to make it smaller, the rectangle is now filled as though I used the bucket tool with anti-alising selected (transparent pixels along the edges).

How to do I turn this off ? or change the settings to prevent this?

seems to be going back a few versions. been on adobe support 2x and both times - support person tried to update the software, which lost my workspace, keyboard shortcuts and eventually asked to "get back to me".

 

 

 

2 replies

Bojan Živković11378569
Community Expert
Bojan Živković11378569Community Expert
Community Expert
August 10, 2020

You have option Image Interpolation in Preferences > General. If that does not help to change to say, Nearest Neighbors then pay attention to have pixels aligned to pixel grid because anti-aliasing occurs when pixels are not aligned to pixel grid or when curve is crossing pixel. Otherwise you can add extra step with layer mask which must be modified further for hard edges when working with curved shapes. Modified layer mask is one of the solutions which come to my mind.

C
chet_60Author
Known Participant
August 10, 2020

Thank you.

FYI: image interpolation is set to Nearest Neighbor as a default.

so it is not that.

seems as though there is an extra step no matter what- in the case that I am not resizing the entire image.

Interesting suggestion to align pixels to grid- because (if it is the SNAP function). We turn that OFF in order to place pixels where we want them. When SNAP is on...pixels jump left or right- usually away from our desired location 1/2 the time.

I will try  for this process.

Thank you

 

JJMack
Community Expert
JJMackCommunity Expert
Community Expert
August 10, 2020

Use vector layer and vector smart object files. Eliminate interpolation when transforming size use vector math instead.

JJMack
chet60
chet60
Participating Frequently
August 10, 2020

Thank you...

extra steps required?

also what is vector math? not pixels?

chet60
chet60
Participating Frequently
August 10, 2020

Pixels will be rendered for the resulting vector graphics transformed size.   The Path is a mathematical plot sizing is a math operation not an interpolation of a raster image pixels.  There are several interpretation you can use to resample are raster image to a different number of pixels   Vector  Shape layer are fill  layers masked by a vector layer mask.


Hello,

anti aliasing introduces new colors to the image. this is a problem.

I can resize the entire image using "nearest neaighbor" as the interpolation.

I can also use the bucket tool to fill selections with anti-aliaisng turned off.

this is the one case where I see anti-aliasing (new colors ) appearing without the ability to stop it.

Raster image pixels are my desired outcome.

I am afraid I do not follow the path, vector, shape layer explanation here as I usually avoid them for this process- as these are vector concepts and do not keep my files in good working order. Even when I used illustrator- i rendered in pixels and used raster settings if I could.

 

so your idea is to use a shape layer and this will eliminiate the anti-aliasing?

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