Photoshop "save for web" JavaScript

This is a JavaScript function for Photoshop which saves the active document as a 24-bit PNG file. It is equivalent to manually selecting File > Save for Web & Devices… which means that the file size of the resulting PNG will be smaller than would be the case using PNGSaveOptions().

function saveForWebPNG(outputFolderStr, filename)
{
    var opts, file;
    opts = new ExportOptionsSaveForWeb();
    opts.format = SaveDocumentType.PNG;
    opts.PNG8 = false;
    opts.quality = 100;
    if (filename.length > 27) {
        file = new File(outputFolderStr + "/temp.png");
        activeDocument.exportDocument(file, ExportType.SAVEFORWEB, opts);
        file.rename(filename + ".png");
    }
    else {
        file = new File(outputFolderStr + "/" + filename + ".png");
        activeDocument.exportDocument(file, ExportType.SAVEFORWEB, opts);
    }
}

Photoshop on Mac limits the length of a File object's file name to 31 characters. Credit for the rename workaround should go to Mark Walsh who posted the solution on the Adobe forums in a thread titled Save for web filename problems.

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