I'd expect Automate > Fit Image to use the interpolation method set in Preferences > General (but I don't know if it does).
EDIT: Fit Image doesn't use the interpolation from preferences, the code is old and the DOM only supports basic Preserve Details, so AM code would be needed:
// resize the image using a good conversion method while keeping the pixel resolution
// and the aspect ratio the same
app.activeDocument.resizeImage(newWidth, newHeight, resolution, ResampleMethod.BICUBIC);
You can use a conditional action:
A very quick, rough'n'ready script version of the action:
/*
// Enable Preserve Details 2 in Preferences/Technology Previews
var idset = stringIDToTypeID( "set" );
var desc2444 = new ActionDescriptor();
var idnull = stringIDToTypeID( "null" );
var ref135 = new ActionReference();
var idproperty = stringIDToTypeID( "property" );
var idexperimentalFeatures = stringIDToTypeID( "experimentalFeatures" );
ref135.putProperty( idproperty, idexperimentalFeatures );
var idapplication = stringIDToTypeID( "application" );
var idordinal = stringIDToTypeID( "ordinal" );
var idtargetEnum = stringIDToTypeID( "targetEnum" );
ref135.putEnumerated( idapplication, idordinal, idtargetEnum );
desc2444.putReference( idnull, ref135 );
var idto = stringIDToTypeID( "to" );
var desc2445 = new ActionDescriptor();
var idexpFeatureDeepUpscale = stringIDToTypeID( "expFeatureDeepUpscale" );
desc2445.putBoolean( idexpFeatureDeepUpscale, true );
var idexperimentalFeatures = stringIDToTypeID( "experimentalFeatures" );
desc2444.putObject( idto, idexperimentalFeatures, desc2445 );
executeAction( idset, desc2444, DialogModes.NO );
*/
// Pixel Width and Height Value
conditionalResize(1000, 1000);
function conditionalResize(W, H) {
if (activeDocument.width > activeDocument.height) {
var idimageSize = stringIDToTypeID("imageSize");
var desc2420 = new ActionDescriptor();
var idwidth = stringIDToTypeID("width");
var idpixelsUnit = stringIDToTypeID("pixelsUnit");
desc2420.putUnitDouble(idwidth, idpixelsUnit, W); // Width in px
var idscaleStyles = stringIDToTypeID("scaleStyles");
desc2420.putBoolean(idscaleStyles, true);
var idconstrainProportions = stringIDToTypeID("constrainProportions");
desc2420.putBoolean(idconstrainProportions, true);
var idinterfaceIconFrameDimmed = stringIDToTypeID("interfaceIconFrameDimmed");
var idinterpolationType = stringIDToTypeID("interpolationType");
var iddeepUpscale = stringIDToTypeID("deepUpscale");
desc2420.putEnumerated(idinterfaceIconFrameDimmed, idinterpolationType, iddeepUpscale);
var idnoise = stringIDToTypeID("noise");
desc2420.putInteger(idnoise, 0); // Noise value
executeAction(idimageSize, desc2420, DialogModes.NO);
} else {
var idimageSize = stringIDToTypeID("imageSize");
var desc2413 = new ActionDescriptor();
var idheight = stringIDToTypeID("height");
var idpixelsUnit = stringIDToTypeID("pixelsUnit");
desc2413.putUnitDouble(idheight, idpixelsUnit, H); // Height in px
var idconstrainProportions = stringIDToTypeID("constrainProportions");
desc2413.putBoolean(idconstrainProportions, true);
var idinterfaceIconFrameDimmed = stringIDToTypeID("interfaceIconFrameDimmed");
var idinterpolationType = stringIDToTypeID("interpolationType");
var iddeepUpscale = stringIDToTypeID("deepUpscale");
desc2413.putEnumerated(idinterfaceIconFrameDimmed, idinterpolationType, iddeepUpscale);
var idnoise = stringIDToTypeID("noise");
desc2413.putInteger(idnoise, 0); // Noise value
executeAction(idimageSize, desc2413, DialogModes.NO);
}
}
https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html
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