In Photoshop CC I have a huge question about the interpolation settings in the Preferences

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In Photoshop CC does the Image interpolation settings "in the Preferences" actually do anything? Please read the entire description below.
In Photoshops CC's Preferences I set the interpolation to Nearest Neighbor (preserve hard edges). I can't find one tool that's affected by this. If I go to image size, free transform, warp etcetera, they all have their own interpolation settings (that don't change when I change the interpolation settings in the preferences).
Please answer this question soon. I teach Photoshop and I'm at a loss to answer this question. I know that in the older versions of Photoshop that adjusting the interpolation settings in the Preferences affected all of the resizing and rotating functions. I just can't figure out what it does in the CC version.
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Frederick Chipkin

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Posted 3 years ago

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Chris Cox

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Yes, it controls the default interpolation method - same as it always has.

But we added options to choose other methods in ImageSize and Free Transform.
But not all resampling operations have their own controls for setting the interpolation.
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Frederick Chipkin

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Hi Chris,

First of all thank you so much for taking the time to answer my question:
FYI: I'm on a PC with Windows 8 but I've had the same experience on a Mac

1.When I do change the interpolation in Photoshop's preferences none of the other interpolation settings previously mentioned are affected (even if I restart Photoshop).
Example: If Free Transform was on Bicubic and I change the Preferences (in the Preferences Panel) to Nearest Neighbor it has no effect on Free Tansforms setting (it stays Bicubic)

2.When you said "But not all resampling operations have their own controls for setting the interpolation" which resampling operations do you mean? Can you please mention one or two (it would be appreciated).

I'm not trying to drive you nuts but these are issues that my students will throw at me & I need to give them back a solid answer.
Again "Thank you" for your time..It's very, very appreciated.
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Chris Cox

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Yes, any tool that has it's own setting for interpolation will remember the last used setting.

But the tools and commands that don't have their own interpolation settings pick up the value from preferences (like image->rotation->arbitrary..., the crop tool, etc.).
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Frederick Chipkin

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Thank you..it's appreciated
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Frederick Chipkin

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OK, sorry dumb question time. I don't see how the crop tool would work with interpolation. I carefully went through all the rotation and warp tools and the only one that I found that is affected by the interpolation setting in the preferences panel is arbitrary rotation. I will continue to look however if you know of more functions that are solely affected by the interpolation in the preferences panel please let me know..There is no rush for this & if you are too busy (I feel that I asked too many questions) then you don't have to do it. Thank you so much.
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Chris Cox

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If you set the crop tool to resample (usually by setting a dpi value), then it will resample the image using the default interpolation method set in preferences.

Yes, there are many more, but I don't have time to look them all up and type out the names.
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Frederick Chipkin

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Is there a reference I can go to. I looked on the internet & found none. The only thing I seem to find is a description of what the interpolations are
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Chris Cox

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No, there isn't a reference for something like that.
If the feature does resampling, and doesn't have it's own setting, then it uses the settings from preferences.
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Frederick Chipkin

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Thank you so much for your time, it was appreciated. If I find any other function that uses solely the interpolation in the preferences panel I'll post it here.