Help:Smoothing text in PDF or DjVu scanned books/fr

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In some scanned PDF or DjVu books the text is not clear enough to read comfortably: the letters look a bit distorted, sharp and edgy. Here is how to smooth it out. The idea is to extract the pages as images and use ImageMagick convert utility to apply a tiny blur, then assemble the images back into a book format. Also, the free version PDF-XChange Viewer allows to view PDF documents with smoothing the text, without changing the file.

Afficher dans l'afficheur PDF X-Change

To view PDF books in PDF-XChange Viewer with smoothed text, enable the setting Edit -> Preferences... -> Rendering -> Smooth text. The file itself is not modified.

Etape 1 : extraire les pages en tant qu'images

See Extract PDF pages as images page.

Etape 2 : assouplir le texte

Use ImageMagick convert to apply a tiny blur.

Etape 3 : reconvertir les images en PDF ou dans le format DjVu

See Creating PDF from images page.

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