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Layers file extension of downloaded PSD file
This is a downloaded PSD file. You can see there are seven layers in the file. Is it possible to find out the file extension of individual layers?
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File extension is a document property, not a layer property. Layers don't have extensions.
The extension signifies a file format, and a file format is a storage container. It's a protocol for packaging the data for disk storage or transfer. Some file formats support layers, others not. The packaging may or may not include data compression.
An open file doesn't have a file format. It is unpacked and un-compressed, so the file format no longer applies. It is just data sitting in computer memory.
The extension tells the operating system and application what the file format is, and so the application can use the correct protocol for unpacking the data.
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