Batch Crop & Straighten

Just a heads up, I tried to run the script but it didn't work. I discovered the script seems to have errors in it. This line for example is wrong:

               var doc= open(fileList);

This line says "open an array of files". The open command doesn't work like that though. It can only open one file.

In fact, the script fails before this, at this line:

          if(fileList instanceof File){

This line says "if my list of files is a file, then carry on". A list of files isn't a file, so the script skips everything after this.

So I fixed the script so it works now. See below. It works on a folder of images. Just make sure there are no subfolders in the folder, otherwise the script will give an error. 

#target Photoshop
app.bringToFront;
var inFolder = Folder.selectDialog("Please select folder to process");
var outfolder = inFolder;
if(inFolder != null){
     var fileList = inFolder.getFiles();
     for(var a = 0 ;a < fileList.length; a++)
     {
          var doc= open(fileList[a]);
          doc.flatten();
          var docname = fileList[a].name.slice(0,-4);
          CropStraighten();
          doc.close(SaveOptions.DONOTSAVECHANGES);
          var count = 1;
          while(app.documents.length)
          {
               var saveFile = new File(decodeURI(outfolder) + "/" + docname +"#"+ zeroPad(count,3) + ".png");
               SavePNG(saveFile);
               activeDocument.close(SaveOptions.DONOTSAVECHANGES);
               count++;
          }
     }
};
function CropStraighten() 
{
     function cTID(s) { return app.charIDToTypeID(s); };
     function sTID(s) { return app.stringIDToTypeID(s); };
     executeAction( sTID('CropPhotosAuto0001'), undefined, DialogModes.NO );
};
function SavePNG(saveFile)
{
    pngSaveOptions = new PNGSaveOptions();
    pngSaveOptions.embedColorProfile = true;
    pngSaveOptions.formatOptions = FormatOptions.STANDARDBASELINE;
    pngSaveOptions.matte = MatteType.NONE;
    pngSaveOptions.quality = 1;
    pngSaveOptions.PNG8 = false; //24 bit PNG
    pngSaveOptions.transparency = true;
    activeDocument.saveAs(saveFile, pngSaveOptions, true, Extension.LOWERCASE);
}
function zeroPad(n, s) 
{
     n = n.toString();
     while (n.length < s) n = '0' + n;
     return n;
};

The approaches mentioned in the link provided by Paul are pretty good.  Thanks for sharing.  The procedure below (duplicated from another similar post I made) may help automate the process a little more.  This approach does assume that there is at least 1 pixel more around your image than the 30(or whatever) pixels you want to add to the image(s).  This is done as an action

- Select entire image
- Select Border with 1 pixel
- Select Grow
At this point a selection should be around your image(s)  with no border.
- Invert Selection

- Expand Selection by number of pixels for desired border extension

- Cmd+J (Ctrl+J for PCs) to copy just the selections to new layer

- File>Automate>Crop & straighten

That should crop and staighten the image(s) to individual image(s) including the extended border.

If you are using a script, you can either call the script from the action or call the action from the script.  Hope that helps.

Here you are, this should do it....

#target Photoshop
app.bringToFront;
var inFolder = Folder.selectDialog("Please select folder to process"); 
if(inFolder != null){
var fileList = inFolder.getFiles(/\.(jpg|tif|psd|)$/i);
var outfolder = new Folder(decodeURI(inFolder) + "/Edited");
if (outfolder.exists == false) outfolder.create();
for(var a = 0 ;a < fileList.length; a++){
if(fileList instanceof File){
var doc= open(fileList);
doc.flatten();
var docname = fileList.name.slice(0,-4);
CropStraighten();
doc.close(SaveOptions.DONOTSAVECHANGES); 
var count = 1;
while(app.documents.length){
var saveFile = new File(decodeURI(outfolder) + "/" + docname +"#"+ zeroPad(count,3) + ".jpg");
SaveJPEG(saveFile, 12);
activeDocument.close(SaveOptions.DONOTSAVECHANGES) ; 
count++;
  }
 }
 }
};
function CropStraighten() {
executeAction( stringIDToTypeID('CropPhotosAuto0001'), undefined, DialogModes.NO );
};
function SaveJPEG(saveFile, jpegQuality){
jpgSaveOptions = new JPEGSaveOptions();
jpgSaveOptions.embedColorProfile = true;
jpgSaveOptions.formatOptions = FormatOptions.STANDARDBASELINE;
jpgSaveOptions.matte = MatteType.NONE;
jpgSaveOptions.quality = jpegQuality; 
activeDocument.saveAs(saveFile, jpgSaveOptions, true,Extension.LOWERCASE);
}
function zeroPad(n, s) { 
n = n.toString(); 
while (n.length < s) n = '0' + n; 
return n; 
};