To address the issue of exporting multiple layers with different blending modes in Photoshop for use in Spine, you can use a script to streamline the process. The key is to ensure that the layers are exported in a way that allows you to use Spine's linked mesh feature, which can save time by reusing mesh and weight data across similar images.
One approach is to use a Photoshop script that exports each layer as a PNG file while maintaining the same size and position. This ensures that when you import these images into Spine, they align correctly, allowing you to use linked meshes. You can find a script for exporting layers from Photoshop to Spine here. This script can be customized to handle specific requirements, such as maintaining layer sizes and positions.
Additionally, you can manually adjust the blending modes in Spine after importing the images. Spine supports different blending modes, and you can set these for each slot in the Spine editor.
By using a script to export layers consistently and leveraging Spine's linked mesh feature, you can significantly reduce the amount of repetitive work required for setting up meshes and weights for similar parts across different layers.