On 04/06/2019 11:57, Mouse wrote:
I don't recall enough details to know whether FlateDecode's compression algorithm is close enough to any of the general-purpose compression
FlateDecode uses the core algorithm from gzip (and also PNG), but won't have the metadata.
DCTDecode uses the JPEG (discrete cosine transform) algorithm, again metadata will be outside the compressed stream.
There is also one for Group 4 Fax, which is what should be, but often isn't, used for bi-level scans of documents, and older PDFs have LZWDecode, which is compress.
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