Since Tiki20, file galleries can index the contents of files with images uploaded to Tiki, by means of "Optical Character Recognition" (OCR), and take the result to feed the search index also.
Tiki relies on https://github.com/tesseract-ocr/tesseract so you need to install as per https://tesseract-ocr.github.io/tessdoc/Installation.html
If you are using WikiSuite, Tesseract is installed by default: https://wikisuite.org/Differences-between-Virtualmin-and-WikiSuite
Server Check helps you confirm that Tesseract is working well, and available to Tiki.
Alias names for this page: OCR | OCRIndexing | Optical Character Recognition