graphics

Using Tesseract 4 with standard settings for OCR, will you give you odd spaces in the Thai letters.

I found this command example to be a good option: tesseract image.png outfile -l Thai -c preserve_interword_spaces=1

In a lot of cases it is useful to convert bitmaps like jpg, png to vector graphics like SVG or AI.

Inkscape -> Path -> Trace Bitmap

BASH

convert file.png file.pnm
potrace file.pnm -s -o file.svg