You’re pushing it through one system that converts a PDF file into printer instructions, and then through another system that converts printer instructions into a PDF file. Each step probably has to make adjustments with the data it’s pushing through.
Without looking deeply into the systems involved, I have to assume it’s not a lossless process.
Why would it cause degradation? You’re not recompressing anything, you’re taking the visible content and writing it to a new PDF file.
You’re pushing it through one system that converts a PDF file into printer instructions, and then through another system that converts printer instructions into a PDF file. Each step probably has to make adjustments with the data it’s pushing through.
Without looking deeply into the systems involved, I have to assume it’s not a lossless process.