Rasterise pages

Use option 'Rasterise' for scanned pages that are not detected as scanned pages by the application.

Question: What happens when I rasterise a page?

Answer: Vector graphics, text documents, et cetera are converted into bitmaps when you rasterise a page. When an image is rasterised, the quality of the image decreases. Select the rasterise mode which best describes the pages that you want to rasterise. The best matching mode generates an optimal rasterise result and preview view.

Question: Why is the preview view of a rasterised page so poor?

Answer: When you rasterise an image you convert the image into a bitmap. For example, you convert a greyscale vector image. The created bitmap can only contain black and white pixels. The different shades of grey must be converted using black and white pixels. Dark grey is represented with more black pixels in a certain area. Light grey is represented with less black pixels in a certain area. The bitmap in the preview view must be resized to fit the preview window. Usually the bitmap is decreased and this results in the 'leaving out of pixels' in the preview view. This results in the poor review quality.

Question: Is the print result of a rasterised page of the same poor quality as the preview view?

Answer: No. The print result is almost the same as a pdf page, as long as you select the correct rasterise mode for the concerning page(s).

Rasterise one or more pages

You can rasterise pages in the clean-up workflow or directly via option rasterise.

1. Click [Pages] - [Rasterize]. Select which pages you want to rasterise.

   When you enter the clean-up workflow, you can rasterise all pages that are not detected as scanned pages. Select option:

   • [Continue scan clean-up with the scanned pages]

     One or more of the selected pages are not detected as scanned pages. Select this option to clean-up only the detected scanned pages.

   • [Rasterize]

     One or more of the selected pages are not detected as scanned pages. Select this option if the selected pages are scanned pages, but some are not detected as scanned pages.

2. Select the rasterise mode which best describes the pages that you want to rasterise:

   • Black and white

     Use this mode for text pages.

   • [Grayscale]

     Use this mode for text pages that contain greyscale images.

   • [Color]

     Use this mode for colour pages.

3. Select the resolution that is used by your printer. The application becomes slower when you select a high resolution.

4. Click [OK].