plotly.js VS OCRmyPDF

Plotly is based on D3. Has both open-source version and paid option.

https://plotly.com/javascript/

Plotly as our chart renderer

In this lesson, we will go through the steps of using Plotly.js in React. Plotly.js is an Open Source Graphing Library. At the end of this lesson, you should be able to do a simple plot with Plotly.js.

Well, MathML[1] support is (nearly) everywhere now, and as the docs say:

MathML Core is a subset with increased implementation details based on rules from LaTeX and the Open Font Format. It is tailored for browsers and designed specifically to work well with other web standards including HTML, CSS, DOM, JavaScript.

I don't have a lot of experience working with this stuff (yet) but if you can script your MathML objects with Javascript, you should be able to make whatever interactive "stuff" you want in terms of math notation. Now drawing objects and plots and stuff is a different question.

There's stuff like Plotly[2], D3[3], Sigma[4], etc. that might be useful depending on exactly what effects you're going for.

[1]: https://developer.mozilla.org/en-US/docs/Web/MathML

[2]: https://github.com/plotly/plotly.js

[3]: https://d3js.org/

[4]: https://www.sigmajs.org/

This is the end of the lesson. For more information on Plotly.js, check the documentation Plotly.

Try https://github.com/ocrmypdf/OCRmyPDF - it uses Tesseract behind the scenes and it absolutely brilliant.

I recommend running any such PDFs through OCRmyPDF.

https://github.com/ocrmypdf/OCRmyPDF

If by "like a photocopy" you mean the file contains images of text rather than text, the MacOS viewer presumably does OCR on the images. I don't know if there's a Linux document viewer with that capability built-in, but a quick search turned up the standalone tool OCRmyPDF.

For anyone interested I solved the problem by first ocr files through the free and open source software ocrmypdf avaible here

ocrmypdf is nice for stuff like that.

Use imagemagick to convert them to PDF and ocrmypdf to straighten and OCR. See this explanation.

Fair enough, maybe this might work for you, it should seperate the text from image anyway and if you have Adobe acrobat it should be able delete the background too with the edit function. It may already be able to do that if you haven't tried it