Using the PDF-OCR option I noticed that the Tesseract-generated mixed-mode 
PDFs (original image-PDF plus OCR-ed text) show coding artefacts which were 
not present in the input image files (I use ImageMagick convert to render 
one image (png or bmp) per PDF-input-page).

So I propose to change Tesseract PDF-OCR mode

   - do not use lossy compression
   - use lossless compression (png)

when rendering the final mixed-mode PDF output files.


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