What Algorithm is Used for Transform?

Question

Background: In Photoshop when you transform you are resizing the image which resamples it using one of Photoshop 25.3.1’s seven algorithms. Question #1: Which one of Photoshop’s serven algorithms is being used?Possible answers:a) The last one used in Photoshop is the one Transform uses.b) “Automatic” is used. Question #2: If “Automatic” is the answer, does this use one of the following two depending if you enlarging the image or reducing it?Enlarge: uses Bicubic SmootherReduction: uses Bicubic Sharper Question #3: If the answer is “The last one used in Photoshop”, then the customer has to add an important step to their workflow.  They have to create a fake document, open an image, and perform a resizing on that document using the algorithm they want to use for the transform in the real document.  This adds the correct algorithm to Photoshop’s “the last one used” buffer.

Jeff Arola · Accepted Answer

Also worth mentioning is that Photoshop 7 has none of the Interpolation methods listed in your post.

In modern versions of Photoshop like the most recent 2024, one can chosse the Interpolation method to use for Transform in the tool options bar when Transform is enabled by going to, for example, Edit>Free Transform.

D Fosse · Answer

You set the default resampling algorithm in Preferences. This is used where it's not otherwise specified.

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