Let’s start by clarifying the most important concept first: the document. For Papermerge a document is anything which is a good candidate for archiving - some piece of information which is not editable but you need to store it for future reference. For example receipts - you don’t need to edit receipts or read them everyday, but eventually you will need them for your tax declaration. In this sense - scanned documents, which are usually in PDF or TIFF format, are perfect match.
Another important thing - if you take a picture of a paper document with your mobile phone - you’ll have a file in jpeg format (or maybe png file format). In context of Papermerge that picture of a document (though just a single jpeg file) is a valid one page document. Generally speaking, pictures of the documents produced by your camera - might be regarded as bad quality scans.
On the other hand, if you take a picture of a flower and upload that jpeg image to Papermerge - the ‘document’ will be processed. However, that jpeg format flower image is not a document in Papermerge sense.
Usually office formats with .docx (Microsoft Word), .odt (Libre Office), .txt (plain text) are not good candidates for archiving - as by their nature they are meant to be changed/edit regularly. However, once converted to PDF format (for instance Contract_C2.docx to Contract_C2.pdf) they are full fledged documents in Papermege sense.
By default, Papermerge works with documents in 4 (four) file formats: pdf, tiff, jpeg and png. However, many other formats (even email messages) can be imported as documents by converting incoming file automatically to PDF format. This is possible due to Document Pipelines feature.
Optical Character Recognition (OCR)
OCR is a technique to extract text information from binary image formats. This technique enables users to:
copy/paste text from the document’s content
search documents by document’s actual text content
OCR is essential tool (or technique if you will) which helps basically to extract textual information and thus derive useful work-flows (based on document’s actual content) with the documents. Papermerge relies on external open source specialized tools like Google’s Tesseract OCR
An informal, more detailed, explanation of term OCR is provided in glossary.
Many times scanning documents in bulk yields documents with blank pages; some pages my be out of order or maybe part of totally different document. Even if you notices these flaws immediately it is time consuming and frustrating to redo scanning process. Papermerge helps you with your scanned documents like no other tool. With Papermerge you can delete blank or erroneous pages, you can move pages from one document into another (with cut and paste) and most importantly you can reorder document pages in case you need to do so.
There is a separate chapter about Page Management where you can learn details about this feature.
Metadata is a very powerful concept and it marks the clear differences between an usual file browser and a system dedicated to manage your documents. Metadata is additional information about your folders, documents and pages. In other words - data about your data. Following picture is a (scanned document) receipt with highlighted shop name, price and date on it.
This additional information - shop name, price and date is so called
document’s metadata. It has two parts a label (in picture above
price are all labels) and a value (in example above values
1.49 for shop label, date label and
price label respectively). Many times instead of term label term key is
Metadata is extremely useful as search criteria when you need to locate specific document among many other very similar documents: for example if you need to find specific receipt issued by Mäc-Geiz company on May 27th, 2018 among other several thousands Mäc-Geiz receipts.
In Papermerge you can set metadata on folders, on documents and on each individual page of the document. Document’s metadata can be viewed and edited on the right side in widgets panel. Additionally if you are inside folder with metadata attributes set, metadata information about each document (of current parent folder) is displayed in so called metacolumns as highlighted in Figure 5.
Read more on this topic in chapter dedicated to Metadata.