One use case that the psd crate is designed to support is an asset pipeline where you're extracting image data from PSD files in order to convert it into the format that your application works with (such as PNG).

In order to support that use case we grant control over exactly which layers in your PSD get exported via the flatten_layers_rgba funcion.

You provide a filter function and any layers that pass your filter (return true) will get blended from top to bottom into a final image.

Here's an example of compositing a final image from layers that do not have names that begin with an underscore.

let psd = include_bytes!("./my-psd-file.psd");

let pixels: Vec<u8> = psd.flatten_layers_rgba(&|(_idx, layer) {
   !layer.name().started_with("_")
}).unwrap();