Re: file formats - photos in Quark

Subject: Re: file formats - photos in Quark
From: Max Wyss <prodok -at- prodok -dot- ch>
To: Suzanne Pyle <comline -at- greennet -dot- net>
Date: Sun, 17 Sep 2000 16:44:37 +0200


at what screen will you have your publication output (lpi). At what resolution do you process your images? Do you plan to scale the images in Quark?

The rule of thumb is that your images should have a resolution in dpi of 2 to 2.5 times the screen value in lpi. It is not necessary to have a higher resolution. However, if you plan to scale the images in Quark, you would have to adjust your resolution, so that this double screen number will be correct with the scaled image. It may be worthwile to scale the images to their final resolution (and therefore size) in Photoshop.

Now, which compression setting you would need for your JPEG, it depends a lot on the kind of image. If it has a lot of texture, but not high contrasts, you can go to relatively high compression (meaning low quality), otherwise stay at lower compression values.

Also, keep in mind that the JPEG compression is lossy. Therefore, refrain from opening a JPEG image and process it again. Keep the Photoshop images around, and do all your processing with these files, and compress only as the last step.

Hope, this can help.

Max Wyss
PRODOK Engineering
Low Paper workflows, Smart documents, PDF forms
CH-8906 Bonstetten, Switzerland

Fax: +41 1 700 20 37
e-mail: mailto:prodok -at- prodok -dot- ch

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I'm doing layout for a magazine in Quark on the PC, and wanted to take
Photoshop files, which are quite huge, and bring them down to a
reasonable size/format. So I've discovered that .JPG seems to work,
whereas .BMP is still rather large. And .EPS format is very large too,
and for some reason Quark doesn't read it. My question for the Quark
layout gurus today is in your experience, has the .JPG format worked
well in terms of print quality (this isn't for the Web--but going to a
printer)? My photos are anywhere from 2 x3 to 5 x 7.

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