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POPhotoshop Javascript for resize based on filesize
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copied!<p>I have a folder with a <em>lot</em> of subfolders, each with a bunch of TIFs and PSD files inside. Some of these have transparency in them while some don't. These files vary massively in size.</p> <p>I need all the files to be turned into JPGs, or if they contain transparency, PNGs. I require the files to be 200kb or less and don't really mind how large they are as long as they aren't scaled up.</p> <p>Someone on a forum (who I'm insanely thankful for) wrote a fair bit of code for it, which my friend modified to suit exactly what I was asking and we're nearly there now. </p> <p>It worked fine, the only problem being that a lot of images came out 1x1 pixel and a solid block of colour.</p> <p>We've found this was consistently happening with the same images for some reason, but couldn't work out what exactly it was in these images.</p> <p>Now Mr forum blokey ( <a href="http://www.photoshopgurus.com/forum/members/paul-mr.html" rel="nofollow">http://www.photoshopgurus.com/forum/members/paul-mr.html</a> ) modified the script and it now seems to work fine with PSDs.</p> <p>It's working with TIFs with transparency but some of the TIFs with 100% opacity it just won't work on. I can't find much that's consistent with these files other than the colour blue, though this just could be a massive coincidence and probably is (there's a lot of blue in the images I've been dealing with).</p> <p>Below is a link to the thread in which the code was first written. Paul MR seems to think the colorsampler bit is a little suspect so perhaps that's what's causing the problems (blueness?).</p> <p><a href="http://www.photoshopgurus.com/forum/photoshop-actions-automation/34745-batching-tiffs-jpg-png-w-automatic-resize-based-filesize.html" rel="nofollow">http://www.photoshopgurus.com/forum/photoshop-actions-automation/34745-batching-tiffs-jpg-png-w-automatic-resize-based-filesize.html</a></p> <p>I wish I could do a little more to try and work this out myself but I've barely a speck of understanding on this stuff, I just know when there's a situation where a bit of scripting could help out.</p> <p>Below is the script as it currently stands:</p> <pre><code>#target PhotoshopString.prototype.endsWith = function(str) { return (this.match(str + "$") == str) } String.prototype.startsWith = function(str) { return this.indexOf(str) == 0; }; var desiredFileSize = 200000; app.bringToFront(); app.displayDialogs = DialogModes.NO; main(); //app.displayDialogs = DialogModes.YES; function main() { var topLevelFolder = Folder.selectDialog("Please select top level folder."); if (topLevelFolder == null)return; var FileList = []; getFileList(topLevelFolder); var startRulerUnits = app.preferences.rulerUnits; app.preferences.rulerUnits = Units.PIXELS; for (var f in FileList) { app.open(FileList[f]); activeDocument.changeMode(ChangeMode.RGB); try { activeDocument.mergeVisibleLayers(); } catch(e) {} var Name = decodeURI(app.activeDocument.name).replace(/.[^.] + $ /, ''); if (hasTransparency(FileList[f])) { var saveFile = File(FileList[f].path + "/" + Name + ".png"); SavePNG(saveFile); app.activeDocument.close(SaveOptions.DONOTSAVECHANGES); } else { var saveFile = File(FileList[f].path + "/" + Name + ".jpg"); SaveForWeb(saveFile, 80); app.activeDocument.close(SaveOptions.DONOTSAVECHANGES); } app.preferences.rulerUnits = startRulerUnits; } function getFileList(folder) { var fileList = folder.getFiles(); for (var i = 0; i < fileList.length; i++) { var file = fileList[i]; if (file instanceof Folder) { getFileList(file); } else { if ((file.name.endsWith("tiff") || file.name.endsWith("tif") || file.name.endsWith("psd")) && ! file.name.startsWith("._"))FileList.push(file); } } } alert(FileList.length + " files have been modified."); } function hasTransparency(file) { if (file.name.endsWith("tiff") || file.name.endsWith("tif")) { var sample = app.activeDocument.colorSamplers.add([new UnitValue(1.5, 'px'), new UnitValue(1.5, 'px')]); try { sample.color.rgb.hexValue; sample.remove(); return false; } catch(e) { sample.remove(); return true; } } var doc = activeDocument; if (doc.activeLayer.isBackgroundLayer)return false; var desc = new ActionDescriptor(); var ref = new ActionReference(); ref.putProperty(charIDToTypeID("Chnl"), charIDToTypeID("fsel")); desc.putReference(charIDToTypeID("null"), ref); var ref1 = new ActionReference(); ref1.putEnumerated(charIDToTypeID("Chnl"), charIDToTypeID("Chnl"), charIDToTypeID("Trsp")); desc.putReference(charIDToTypeID("T "), ref1); executeAction(charIDToTypeID("setd"), desc, DialogModes.NO); var w = doc.width.as('px'); var h = doc.height.as('px'); var transChannel = doc.channels.add(); doc.selection.store(transChannel); if (transChannel.histogram[255] != (h * w)) { transChannel.remove(); return true; } else { transChannel.remove(); return false; } }; function SavePNG(saveFile) { pngSaveOptions = new PNGSaveOptions(); activeDocument.saveAs(saveFile, pngSaveOptions, true, Extension.LOWERCASE); var actualFilesize = saveFile.length; var ratio = desiredFileSize / actualFilesize; if (ratio < 1) { var imageScale = Math.sqrt(ratio); activeDocument.resizeImage(activeDocument.width * imageScale, activeDocument.height * imageScale, activeDocument.resolution, ResampleMethod.BICUBICSMOOTHER); activeDocument.saveAs(saveFile, pngSaveOptions, true, Extension.LOWERCASE); } } function SaveForWeb(saveFile, jpegQuality) { var sfwOptions = new ExportOptionsSaveForWeb(); sfwOptions.format = SaveDocumentType.JPEG; sfwOptions.includeProfile = false; sfwOptions.interlaced = 0; sfwOptions.optimized = true; sfwOptions.quality = jpegQuality; activeDocument.exportDocument(saveFile, ExportType.SAVEFORWEB, sfwOptions); var actualFilesize = saveFile.length; var ratio = desiredFileSize / actualFilesize; if (ratio < 1) { var imageScale = Math.sqrt(ratio); activeDocument.resizeImage(activeDocument.width * imageScale, activeDocument.height * imageScale, activeDocument.resolution, ResampleMethod.BICUBICSMOOTHER); activeDocument.exportDocument(saveFile, ExportType.SAVEFORWEB, sfwOptions); } } </code></pre>

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