Requirements for PDF imports
If you are delivering your e-paper content as a PDF for import via sFTP Upload (Purple Importer) or sending it to X-CAGO, it is important to follow the requirements in this article so that the content can be consumed by the Purple Platform.
To achieve a perfect result, the PDF files should meet the following specifications:
- Colour system: RGB
- PDF version > 1.6
- JPEG image compression
- dpi > 150 - 300 (only has an influence on the display quality), from 300 dpi onwards you should scale down to avoid errors caused by too large file sizes.
Note: Please do not use print PDFs, i.e. no CMYK images and no crop marks.
The PDF files supplied to be used in read mode in the app with our external supplier X-CAGO, must comply with separate specifications in order to exclude processing errors: If your issues will processed from X-CAGO, they have to be delivered as a ZIP file (PDF in ZIP). Learn more in XML (EPUB) Specification.
- No read-only PDFs may be used.
- All pages must be single pages (no double pages).
- All pages should be arranged in the order in which they will be displayed in the final result.
- Trim boxes should always be set correctly, i.e. contain only the relevant page information without bleed and should not overlap with the opposite side of the double page.
- All text and fonts must be fully embedded in the PDF.
- The text must not be rasterised or have paths.
- All text is extracted as it appears in the PDF. If glyphs or special fonts are used that change the appearance of a character, only the character will be extracted.
- Images should not be reduced to background so that they can be extracted as separate objects.
- Down-sampling should be avoided if possible. Some down-sampling is preferable for file size reasons.
- Aim to ensure sharpness in large images with a maximum width or height of 2400 px.
- Images larger than 300 dpi are preferred as long as the output size does not exceed ~300MB. If the output is larger than 300MB, please reduce the resolution to ~150 dpi and/or use better compression.
- RGB colour space