Daniel Reetz, the founder of the DIY Book Scanner community, has recently started making videos of prototyping and shop tips. If you are tinkering with a book scanner (or any other project) in your home shop, these tips will come in handy. https://www.youtube.com/channel/UCn0gq8 ... g_8K1nfInQ

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by zbgns
31 Jan 2021, 10:51
Forum: Scan Tailor
Topic: Combining Split output into PDF
Replies: 9
Views: 1100

Re: Combining Split output into PDF

What I don't understand, better, I don't know is how to achieve the 2 passages after scantailor: PDF size 50% JPEG -G4 and PDF at 150dpi scaling (I am on linux). Can you explain me what have I to do? What do you mean by 'PDF size 50% JPEG -G4'? Do you want to have JPEG compression applied to color ...
by zbgns
22 Jan 2021, 08:02
Forum: Scan Tailor
Topic: Combining Split output into PDF
Replies: 9
Views: 1100

Re: Combining Split output into PDF

Adobe Acrobat in more recent versions does a good job with Scan Tailor output and creates such 'optimized' pdf files, where color and b&w content is segmented and compressed separately. The result seems to me to be similar to Abbyy FineReader MRC compression model.
by zbgns
26 Nov 2020, 07:57
Forum: Tutorials/How-To's
Topic: How to convert a book to serchable pdf using open source software
Replies: 28
Views: 136674

Re: How to convert a book to serchable pdf using open source software

Actually, each book created by me using the described method has a colored front cover and back cover. Contents between covers are binarized (B&W). There may be added pictures in color, but it would be necessary to manually convert them to appropriate format and turn into pdf, and afterwards insert ...
by zbgns
24 Nov 2020, 15:40
Forum: Scan Tailor
Topic: output dimensions ratio
Replies: 2
Views: 1066

Re: output dimensions ratio

In the bottom part, near the right-hand corner you have information on dimensions of the image. Width and height may be adjusted at the 'Margins' stage. You may change units by selecting 'Tools' and 'Units'.
by zbgns
14 May 2020, 14:21
Forum: Tutorials/How-To's
Topic: How to convert a book to serchable pdf using open source software
Replies: 28
Views: 136674

Re: How to convert a book to serchable pdf using open source software

My bad. I was convinced that OCRmyPDF supports jbig2 but apparently this applies only to regular pdfs.
by zbgns
06 May 2020, 09:34
Forum: Tutorials/How-To's
Topic: How to convert a book to serchable pdf using open source software
Replies: 28
Views: 136674

Re: How to convert a book to serchable pdf using open source software

Thank you for your comments and sharing details of your workflow. Nice to see, that someone found useful the thread I wrote. First I think the cover should be at the same size when scrolling the pdf file. I had some problem since I scanned the covers at higher resolutions. You are right. The scripts...
by zbgns
22 Feb 2020, 19:06
Forum: Tutorials/How-To's
Topic: From tiff-scans, ScanTailor and Tesseract to djvu-files - how?
Replies: 2
Views: 2456

Re: From tiff-scans, ScanTailor and Tesseract to djvu-files - how?

By far the most time consuming part is the OCR. I am wondering, if the -j option from ocroodjvu would speed this up (number of OCR threads)? Is there a relation between the threads and the cpu-cores. What amount of threads would be meaningful (I have an AMD cpu with 6 cores, and an nivida GPU) I gu...
by zbgns
20 Jan 2020, 18:15
Forum: Scan Tailor
Topic: What to do with a page with text and graphics
Replies: 4
Views: 2205

Re: What to do with a page with text and graphics

I attach some screenshots and hope you will find them useful. 1. Let's say there is a page with pictures and text (doesn't matter there are in grayscale, the same apply to color ones) Zrzut ekranu z 2020-01-17 22-00-59.png 2. In the "Output" stage: a. Change "Mode" from "Black and White" to "Mixed" ...
by zbgns
09 Jan 2020, 21:17
Forum: Tutorials/How-To's
Topic: How to convert a book to serchable pdf using open source software
Replies: 28
Views: 136674

Re: How to convert a book to serchable pdf using open source software

As you already wrote it was the sorting problem due to inconsistent naming of files. BTW this is not the Tesseract issue as it cannot process batch of separate files directly and the workaround is necessary by creating a list of files in right order which Tesseract may follow. This list was created ...
by zbgns
09 Jan 2020, 06:50
Forum: Scan Tailor
Topic: What to do with a page with text and graphics
Replies: 4
Views: 2205

Re: What to do with a page with text and graphics

In case where there are pages with text and photos it would be possible to apply the "mixed output" (text areas are binarized but pictures remain in color). Picture areas should be selected and indicated as picture zones and "Rectangular picture shape" mode from ST Advanced is really helpful for tha...