Hopefully the following script will suffice as a short term work-around. An action can also do similar. I also agree that this is a step backwards, not forwards and that having to come up with work-arounds is far from ideal.
/*
Transparency Bounding Pixels.jsx
Stephen Marsh
Version 1, 22nd September 2021
Adds a 1% white pixel to the upper left and lower right corners of the open document
Note: Assumes that the active layer is a raster layer can be filled!
https://community.adobe.com/t5/photoshop-ecosystem-discussions/export-as-now-crops-to-contents-instead-of-using-the-mask/td-p/12336888
Export As now crops to contents instead of using the mask
*/
#target photoshop
if (documents.length) {
// Main script
function main() {
var origRuler = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS;
var docWidth = app.activeDocument.width.value;
var docHeight = app.activeDocument.height.value;
setSelection(0, 0, 1, 1);
whiteFill(1.000000);
app.activeDocument.selection.deselect();
setSelection(docHeight - 1, docWidth - 1, docHeight, docWidth);
whiteFill(1.000000);
app.activeDocument.selection.deselect();
app.preferences.rulerUnits = origRuler;
}
app.activeDocument.suspendHistory("Run script", "main()");
/*********** Functions ***********/
function setSelection(top, left, bottom, right) {
var s2t = function (s) {
return app.stringIDToTypeID(s);
};
var descriptor = new ActionDescriptor();
var descriptor2 = new ActionDescriptor();
var reference = new ActionReference();
reference.putProperty(s2t("channel"), s2t("selection"));
descriptor.putReference(s2t("null"), reference);
descriptor2.putUnitDouble(s2t("top"), s2t("pixelsUnit"), top);
descriptor2.putUnitDouble(s2t("left"), s2t("pixelsUnit"), left);
descriptor2.putUnitDouble(s2t("bottom"), s2t("pixelsUnit"), bottom);
descriptor2.putUnitDouble(s2t("right"), s2t("pixelsUnit"), right);
descriptor.putObject(s2t("to"), s2t("rectangle"), descriptor2);
executeAction(s2t("set"), descriptor, DialogModes.NO);
}
function whiteFill(fillOpacity) {
var idfill = stringIDToTypeID("fill");
var desc279 = new ActionDescriptor();
var idusing = stringIDToTypeID("using");
var idfillContents = stringIDToTypeID("fillContents");
var idwhite = stringIDToTypeID("white");
desc279.putEnumerated(idusing, idfillContents, idwhite);
var idopacity = stringIDToTypeID("opacity");
var idpercentUnit = stringIDToTypeID("percentUnit");
desc279.putUnitDouble(idopacity, idpercentUnit, fillOpacity);
var idmode = stringIDToTypeID("mode");
var idblendMode = stringIDToTypeID("blendMode");
var idnormal = stringIDToTypeID("normal");
desc279.putEnumerated(idmode, idblendMode, idnormal);
executeAction(idfill, desc279, DialogModes.NO);
}
} else {
alert('There are no documents open.');
}
https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html
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