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When TESSDATA_PREFIX points at a hand-assembled tessdata folder lacking the configs/ subdirectory (e.g. files pulled from tessdata_best), Tesseract prints "read_params_file: Can't open hocr/txt" and produces no output. The runtime now surfaces a clear error (v17.5.0); add the matching documentation: a new errors.md entry and a note on the TESSDATA_PREFIX docs.
80 lines
3.0 KiB
Markdown
80 lines
3.0 KiB
Markdown
% SPDX-FileCopyrightText: 2022 James R. Barlow
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% SPDX-License-Identifier: CC-BY-SA-4.0
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# Common error messages
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## Page already has text
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:::{code}
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ERROR - 1: page already has text! – aborting (use --force-ocr to force OCR)
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:::
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You ran ocrmypdf on a file that already contains printable text or a
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hidden OCR text layer (it can\'t quite tell the difference). You
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probably don\'t want to do this, because the file is already searchable.
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As the error message suggests, your options are:
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- `ocrmypdf --force-ocr` to
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`rasterize <raster-vector>`{.interpreted-text role="ref"} all vector
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content and run OCR on the images. This is useful if a previous OCR
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program failed, or if the document contains a text watermark.
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- `ocrmypdf --skip-text` to skip OCR and other processing on any pages
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that contain text. Text pages will be copied into the output PDF
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without modification.
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- `ocrmypdf --redo-ocr` to scan the file for any existing OCR
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(non-printing text), remove it, and do OCR again. This is one way to
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take advantage of improvements in OCR accuracy. Printable vector
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text is excluded from OCR, so this can be used on files that contain
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a mix of digital and scanned files.
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## Input file \'filename\' is not a valid PDF
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OCRmyPDF checks files with pikepdf, a library that in turn uses libqpdf
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to fixes errors in PDFs, before it tries to work on them. In most cases
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this happens because the PDF is corrupt and truncated (incomplete file
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copying) and not much can be done.
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You can try rewriting the file with Ghostscript:
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:::{code} bash
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gs -o output.pdf -dSAFER -sDEVICE=pdfwrite input.pdf
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:::
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`pdftk` can also rewrite PDFs:
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:::{code} bash
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pdftk input.pdf cat output output.pdf
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:::
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Sometimes Acrobat can repair PDFs with its [Preflight
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tool](https://helpx.adobe.com/acrobat/using/correcting-problem-areas-preflight-tool.html).
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(tesseract-config-missing)=
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## Tesseract cannot open its config file \'hocr\' or \'txt\'
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:::{code}
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ERROR - Tesseract cannot open its config file 'hocr'.
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:::
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OCRmyPDF asks Tesseract to produce `hocr` and `txt` output. Tesseract
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reads the instructions for these output formats from configuration files
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named `hocr` and `txt` that live in the `configs/` subdirectory of its
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`tessdata` folder. If those files are missing, Tesseract prints
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`read_params_file: Can't open hocr`, exits without error, and produces no
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output.
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This usually happens when a `tessdata` directory was assembled by hand --
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for example, by downloading individual `.traineddata` files from
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[tessdata_best](https://github.com/tesseract-ocr/tessdata_best) and
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pointing `TESSDATA_PREFIX` at them -- because those repositories do not
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include the `configs/` directory. A complete Tesseract installation from
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your operating system\'s package manager includes it.
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To fix this, ensure the `configs/hocr` and `configs/txt` files exist in
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the `tessdata` directory that Tesseract is using. Copying the `configs/`
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directory from a full Tesseract installation is sufficient. See
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{envvar}`TESSDATA_PREFIX` for more on selecting an alternate `tessdata`
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folder.
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