Conversion de Documents PDF en Formats d'Images Haute Résolution
Conversion de Documents PDF en Formats d'Images Haute Résolution
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Formule & Méthode de Calcul
Extraction = Decode(Binary Stream) ➔ Parse(Font Subsets) ➔ Render(Canvas Context)
To extract an image, the browser must act as a virtual printer. It reads the PDF drawing commands and mathematically paints the vectors and fonts onto an invisible HTML5 Canvas, which is then exported as a JPEG.
Bonnes Pratiques & Conseils
- Set High DPI for Print: If you are converting a PDF to a JPEG for professional printing, you must render the canvas at a minimum of 300 DPI (Dots Per Inch). Rendering at standard web 72 DPI will look horribly pixelated on paper.
- Understand Text Boundaries: PDF text is not structured like a Word document; it is just characters placed at exact X/Y coordinates. Extracting text often results in weird line breaks because the PDF has no concept of 'paragraphs'.
- Beware of Scanned PDFs: If a PDF is just a scanned photo of a piece of paper, the text extractor will find zero text. It will only see a single giant image.