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Copy and paste the following code into ExtendScript (this gets installed with Photoshop) and run the script.

It will prompt for the folder of files to be processed. (I am guessing they are JPG)

The files will be split and put into anew folder called Processed off the selected folder.

[code]

#target photoshop

app.bringToFront();

function main(){

var inputFolder= Folder.selectDialog ("Please select folder to process");

if(inputFolder == null) return;

var fileList = inputFolder.getFiles("*.jpg");

var outFolder = Folder(inputFolder +"/Processed");

if(!outFolder.exists) outFolder.create();

for(var z in fileList){

    open(fileList[z]);

var doc = activeDocument;

var Name = decodeURI(fileList[z].name.replace(/\.[^\.]+$/, ''));

var startRulerUnits = app.preferences.rulerUnits;

app.preferences.rulerUnits = Units.PIXELS;

var LB=[];

LB[0] = 0;

LB[1] = 0;

LB[2] = 512;

LB[3] = doc.height.value;

doc.selection.select([[LB[0],LB[1]], [LB[2],LB[1]], [LB[2],LB[3]], [LB[0], LB[3]]], SelectionType.REPLACE, 0, false);

var savedState = doc.activeHistoryState;

executeAction( charIDToTypeID( "Crop" ), undefined, DialogModes.NO );

saveFile= File(outFolder + "/" + Name + "-512.jpg");

SaveForWeb(saveFile,80);

doc.activeHistoryState = savedState;

doc.selection.invert();

executeAction( charIDToTypeID( "Crop" ), undefined, DialogModes.NO );

saveFile= File(outFolder + "/" + Name + "-rest.jpg");

SaveForWeb(saveFile,80);

app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);

app.preferences.rulerUnits = startRulerUnits;

}

}

main();

function SaveForWeb(saveFile,jpegQuality) {

var sfwOptions = new ExportOptionsSaveForWeb();

   sfwOptions.format = SaveDocumentType.JPEG;

   sfwOptions.includeProfile = false;

   sfwOptions.interlaced = 0;

   sfwOptions.optimized = true;

   sfwOptions.quality = jpegQuality; //0-100

activeDocument.exportDocument(saveFile, ExportType.SAVEFORWEB, sfwOptions);

}

[/code]