I would suggest a different approach. Create your watermark as a large document. A Canvas size that is many pixel wide and high. Use as many layers as you want and save it as a PSD file you can make modification in the future. However also save is as a large png file with a transparent background. Use this png file to watermark your images. The PNG will not be a very large files and it can be placed into your image documents and be sized and position via the place transform for the image. A single smart object layer the can repositioned and resized. All your watermark's pixels are in the object it will always resize well. I have posted a script that you can use to automate that process. You can even record using the script in an action and add a layer style to the layer. The action can be batch. The Watermark will be sized for the document for which it is place into.
Here is the script change line 3 through 6 to customize it for your use.
#target photoshop;
app.bringToFront();
var logoFile = "~/Desktop/JJMack.png"; // Watermark file should be large for resize down works better than up
var LogoSize = 10; // percent of document height to resize Watermark to
var LogoMargin = 1; // percent of Document height the Watermark should have as a margin
var BottomLetf = false; // false = Bottom Right true Bottom Left
placeWatermark(logoFile, LogoSize, LogoMargin); // Place Watermark into the bottom of the document
function placeWatermark(Image,Size,Margin){
if(!documents.length) return; // if no document return
try{
var doc = app.activeDocument; // set Doc object to active document
app.displayDialogs = DialogModes.NO; // Dialog off
var strtRulerUnits = app.preferences.rulerUnits; // Save Users ruler units
var strtTypeUnits = app.preferences.typeUnits; // Save Users Type units
app.preferences.rulerUnits = Units.PIXELS; // work with pixels
app.preferences.typeUnits = TypeUnits.PIXELS; // work with pixels
var fileObj = new File(Image); // the passed file
if(!fileObj.exists){ // If file does not exits tell user
alert(fileObj.name + " does not exist!");
return;
}
placeFile(fileObj); // Place in file the Watermark png file
activeDocument.activeLayer.resize(100 ,100,AnchorPosition.MIDDLECENTER); // Insure Place did not scale layer
var SB = activeDocument.activeLayer.bounds; // get layers bounds
var layerHeight = SB[3] - SB[1]; // get layers height
var resizePercent = (100/layerHeight)*(Size/100*doc.height.value); // Percent to resize by
activeDocument.activeLayer.resize(resizePercent ,resizePercent,AnchorPosition.MIDDLECENTER); // Resize width and height by percentage
SB = activeDocument.activeLayer.bounds; // get resized layers bounds
activeDocument.activeLayer.translate(-SB[0].value,-SB[1].value); // Move resized layer to top left canvas corner
var LayerWidth = (SB[2].value - SB[0].value);
var LayerHeight = (SB[3].value - SB[1].value);
marginSize = Margin/100*doc.height.value; // Margin size
// move resized watermark into the document lower right corner with some margin or lower left
if ( BottomLetf) {activeDocument.activeLayer.translate(marginSize,( doc.height.value -marginSize - LayerHeight));}
else {activeDocument.activeLayer.translate((doc.width.value -marginSize - LayerWidth),( doc.height.value -marginSize - LayerHeight));}
}
catch(e) { alert(e + ': on line ' + e.line); } // inform user of error
finally{
app.preferences.rulerUnits = strtRulerUnits; // Restore user ruler units
app.preferences.typeUnits = strtTypeUnits; // Restore user type units
};
};
function placeFile(placeFile) {
var desc21 = new ActionDescriptor();
desc21.putPath( charIDToTypeID('null'), new File(placeFile) );
desc21.putEnumerated( charIDToTypeID('FTcs'), charIDToTypeID('QCSt'), charIDToTypeID('Qcsa') );
var desc22 = new ActionDescriptor();
desc22.putUnitDouble( charIDToTypeID('Hrzn'), charIDToTypeID('#Pxl'), 0.000000 );
desc22.putUnitDouble( charIDToTypeID('Vrtc'), charIDToTypeID('#Pxl'), 0.000000 );
desc21.putObject( charIDToTypeID('Ofst'), charIDToTypeID('Ofst'), desc22 );
executeAction( charIDToTypeID('Plc '), desc21, DialogModes.NO );
};
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