See it at the final size… finally!

Two previous Colecandoo articles (part one and part two) discussed the inability of InDesign to control the view size and appearance of PDFs that were exported using the Adobe PDF export function from the file menu.

Since the June release of Adobe InDesign CC 2015, this is no longer an issue. As part of the PDF export dialog box, a new “viewing” portion has been added to the interface that allows for the view size and the layout.

exportpdf1It is worth noting though that the compatibility dropdown of the PDF export options must be set to Acrobat 6 (PDF 1.5) before this feature will fully display all options in the layout dropdown field. If the compatibility dropdown is set to Acrobat 5 (PDF 1.4) or lower, then two of the layout options – Two-Up (Facing) and Two-Up (Cover Page) – will be greyed out.

exportpdf2It is great that this feature has been added to the PDF export interface. Let us see if future releases of InDesign CC can also incorporate other PDF export features such as:

  • Ability to create and export PDF comments directly in an InDesign file; and
  • More support for PDF forms.

Just to find fault however, I have noticed that the Pages portion of the PDF export Dialog box has NOT incorporated a change that was made to the print dialog box, and that was the inclusion of the option for “current page”.

Lineart vs Greyscale scans for text

When faced with creating artwork a black and white book from a previous print that has no digital artwork available, the fastest and cheapest option is to scan the book. This assumes that there are no changes to the text, that the book is for print only, and that the client has allowed the spine to be cut off of the book so that the pages can scan through a document feeder. If the book is text only with no halftone, I would recommend the scans end up as 1200 dpi linearts. This is fine if the book is text only, but if the text contains images such as photographs, then two scans are required – one for the text (linearts), and one for the images (300dpi greyscales). The two sets of scans then have to be combined by placing the images into InDesign.
One might ask “why not use greyscale scans at 1200dpi”? Apart from the filesize when printing – the text will look terrible. To understand why high resolution doesn’t always equal better quality, the answer lies in one process: Rasterising.
Regardless whether a greyscale scan is 300dpi, 600dpi or 1200dpi, the scan will still have to go through the rasterising stage on the copier where a filter is applied to make the shades of grey that the artwork may contain. This is usually done with a halftone filter in the copier’s RIP software. This is where the images are converted into halftone dots – measured in LPI – Lines (of dots) Per Inch.
nosharper1Using a 150lpi halftone filter, here is what happens when the same images are rasterised (click on the image to see at correct size):
nosharper2The 600dpi and 1200dpi images do look better than the 300dpi, but the type is still not sharp, and looks bumpy. This is because of the halftoning that is occurring in the RIP. Despite the resolution the text was scanned, the bumps on each image are in the same spots in each scan (though the severity of the “bumps” is different with the dpi)
Lineart images are different in that there are no shades of grey, and do not have halftone applied to them. So once passing through a 150lpi halftone filter, here is how the images look after being rasterised (click on the image to see at correct size):
nosharper3Here, the difference in dpi does matter, as the 1200dpi lineart is sharper than the 600dpi lineart, which is definitel­y sharper than the 300dpi lineart
Here is the side-by-side comparison (click on the image to see at correct size):
nosharper4So by creating the book with separate scans for the images and type, the quality will be greatly improved, but will take longer to set up.

See it at the final size – view size and Acrobat: Part 2

2015-07-03 NOTE: This article is now out of date since the release of Adobe InDesign CC 2015. However, I have left the article here for posterity.

A previous Colecandoo article presented a way of being able to control the view size and page presentation of PDFs used as soft-proofs for clients. The solution was to use the Actions tool in Adobe Acrobat to apply an appropriate action that contains the necessary view size/page presentation settings.

This method certainly works, but there is a far more easy method that can be done directly from Adobe InDesign, and that is to export as an interactive PDF.

As a printer that, I had created very little interactive content until recently. I felt that the “Export to Interactive PDF” was only of use for content that contained form fields or other interactive elements, so I had not considered this an option… until now. In fact, this method is much easier than the method described in the previous article. Once again though, this should only be used when a client is checking the content of the PDF only.

To do this, select File/Export (or command + e on a Mac) and from the dialog box, select Adobe PDF (Interactive) from the dropdown list and click Save.

interpic01A new dialog box will appear showing the available options for export, including the view and layout settings.

interpic02If preparing a proof that is to appear as readers spreads, be careful that it is possible to select the same view in two places in this dialog box, with some unwanted consequences.

interpic03To avoid this, use the Two-Up (Cover Page) option available from the Layout dropdown menu, rather than the Spreads option from the Pages/Spreads radio buttons.

The method still needs improvement…

One important note is that unlike the PDF export option for print, there is no way to save export presets for Interactive PDFs. Instead, the options used to last export an interactive PDF are maintained for the next export.

With this in mind, PDFs can also be exported en masse using Peter Kahrel’s batch convert script, but make sure that prior to using the script, one file is correctly exported to interactive PDF before using the script. Peter’s instructions do say this already, but it is worth writing it again.


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