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Old 08-28-2010, 02:23 PM   #4
jswinden
Astrophotographer
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Posts: 6,167
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Join Date: Sep 2006
Location: Everman, Texas
Device: iPad Pro 9.7, iPad Mini 2, iPhone 6+, Voyage, Fire TV, Echo and Dot
I'm not sure where tomsem got his assumptions, but the contrast settings do help out with scanned black and white documents that were converted to PDFs.

Here is a complete set of five screenshots showing a scanned image PDF as viewed in all five contrast settings: Lightest, Lighter, Default, Darker, Darkest.

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Name:	1-pdf-lightest-contrast.gif
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ID:	57280   Click image for larger version

Name:	2-pdf-lighter-contrast.gif
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ID:	57281   Click image for larger version

Name:	3-pdf-default-contrast.gif
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Name:	4-pdf-darker-contrast.gif
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ID:	57283   Click image for larger version

Name:	5-pdf-darkest-contrast.gif
Views:	606
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ID:	57284  
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