The problem is each smart object layer in each layer group needs to be either be replaced using Replace Content with an exactly same size object or the object opened and edited manualy so you can handle miss matches in size, aspect ratio and resolution. Replace Content is like using Place. Place does some resizing based on object print resolution. While the Layer content will have the same print resolution as the template the object may have a different Print Resolution and Place will resize the object based one the different Print resolution. So the replacement object must have exactly the same aspect ration, the same width and height at the same print resolution as the object in the template. Otherwise the Smart object layer will be a different size and the transform associate with the smart object layer will not work corrected for the transform is not replace or altered with replace content..
My script can do what is required for templates with a single collage. Templates with more than one layout would require a custom script for each layout in the template IMO it not a viable solution. When you consider how easy it is to create a single layout template. A single template like this layout would require a background layer and 5 alpha channel.]
The Templates like that I saw where from Adobe. Each collage layout was in a separate Layer Group. So you can control which Layout is visible using the Viability control of the groups groups. With one Group visible you save out the populated collage into an Image file. That kind of template used manually and you normally open smart Object layers to edit their content to populate a layout. The template would be very hard to Automat it population. If you want to Populate Templates and Mockup look at my Photoshop Photo Collage and Mockup Toolkit. I added mockup support not long ago. Templaye only have a single layout so the can be populate easily via a Photoshop Scripts. The script are part og the toolkit.
Photo Collage and Mockup Toolkit
Photoshop scripting is powerful and I believe this package demonstrates this. Here is a video showing a 5 image collage PSD template being populated with images
The package includes four simple rules to follow when making Photo Collage Template PSD files so they will be compatible with my Photoshop scripts.
Size the photo collage templates for the print size you want - width, height and print DPI resolution.
Photo collage templates must have a Photoshop background layer. The contents of this layer can be anything.
Photo collage templates must have alpha channels named "Image 1", "Image 2", ... "Image n".
Photo collage templates layers above the background layers must provide transparent areas to let the images that will be placed below them show through.
There are eighteen scripts in this package they provide the following functions:
HelpPhotoCollageToolkit.jsx - Online Help
TestCollageTemplate.jsx - Used to test a Photo Collage Template while you are making it with Photoshop.
CollageTemplateBuilder.jsx - Can build Templates compatible with this toolkit's scripts.
LayerToAlphaChan.jsx - Used to convert a Prototype Image Layer stack into a template document.
InteractivePopulateCollage.jsx - Used to interactively populate Any Photo Collage template. Offers most user control inserting pictures and text.
ReplaceCollageImage.jsx - use to replace a populated collage image Smart Object layer with an other image correctly resized and positioned.
ChangeTextSize.jsx - This script can be used to change Image stamps text size when the size used by the populating did not work well.
PopulateCollageTemplate.jsx - Used to Automatically populate a Photo Collage template and leave the populated copy open in Photoshop.
BatchOneImageCollage.jsx - Used to Automatically Batch Populate Collage templates that only have one image inserted. The Collage or Image may be stamped with text.
BatchMultiImageCollage.jsx - Used to Automatically Batch Populate Any Photo Collage template with images in a source image folder. Easier to use than the interactive script. Saved collages can be tweaked.
PasteImageRoll.jsx - Paste Images into a document to be print on roll paper.
BatchPicturePackage.jsx - Used to Automatically Batch Populate Any Photo Collage template with an image in a source image folder. Images Rotates for best fit.
BatchPicturePackageNoRotate.jsx - Used to Automatically Batch Populate Any Photo Collage template with an image in a source image folder.
PopulatePicturePackage.jsx - Used to Automatically populate a Photo Collage template Fill with the same single image and leave the populated copy open in Photoshop.
PCTpreferences.jsx - Preferences Use in several of the above scripts. Edit this file to change default settings and add layer styles.
BatchReplaceOneObject.jsx - Used to populate simple Mockup templates. Simple Mockup have one rule the top layer must be a Smart Object Layer it contents will be replaced and a Jpeg file saved.
BatchUpdateSmartObject.jsx - Used to populate simple Mockup templates like BatchReplaceOneObject script but can update more than a single smart object layer.
BatchMockupTemplates.jsx - Used to populate mutiple Mockup Template that need to be populated eith the same replacement image objects.
Mockup Support Added
I created my Photoshop Photo Collage Toolkit nine years ago and Avoided supporting Templates that used Smart Object layers to warp, to add perspective, to rotate, add any distortion to images. Because replacement Image file needed to have exactly the same Aspect Ratio, Size and Print resolution as the Object in the Template's smart object layers object. Lately there have been some threads in Adobe Photoshop scripting forums dealing with updating/populating products Mockups Templates that have prototype smart object layers that need to be updated to create the output mockup files. These were good threads and prompted me to do some thinking.
So like my Photo Collage Template design has four simple rules. I came up with four simple rules for Mockup templates. I find that I can easily modify Photo Collage Templates and Mockup Template files I download from the web so they comply with my Photo Collage Template rules or my Simple Mockup Template rules. Mockup templates may be far from simple the only simple part is they are easy to update. So I have add support to my Photo Collage Toolkit to support Mockup templates.
Simple Mockup Templates Four Rules
Simple Mockup Templates Only the Smart Object Layer on the top of the Template layers stack will be updated then a Jpeg file saved.
Only Photoshop Objects are support in the top smart objects layers. That is they can not be Object File that are not supported by Photoshop like Camera RAW Files or Illustrator file like .ai, .svg. I suggest these objects should be PSD or PSB that Photoshop creates. Avoid using PNG objects in Mockup template. For when replace content is used to replace .png objects within a .psd template which has your png's object the replace content operation is very slow.
The first None Smart Object Layer near the top of the layer stack Marks the end of Smart Object Layers the will be updated. Lower Smart Object Layers only update if they share top layers objects.
The Replacement Image Collection need to be in sub folders named obj0, obj1, obj2, .... objN. Each folder must contains the same number of replacement Image files.
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