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Poor image rendering quality  XML
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schlenol

Joined: 17/Jun/2005 00:00:00
Messages: 17
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Hi,

the attached pdf document contains screenshot. With the viewer ri (6.3-snapshot and 6.2.1, both OS) these images weren't rendered sharp. I tried to optimize rendering with the system property "org.icepdf.core.imageReference" (both inside the viewer ri through the preferences and inside our own application) and also with "org.icepdf.core.screen.render" but without success.

Do you have any suggestions how to improve the quality of image rendering (Adobe Reader shows sharp images, so it should be principally possible).

Regards,
Oliver Schlenzka
 Filename Druckbild.pdf [Disk] Download
 Description
 Filesize 251 Kbytes
 Downloaded:  880 time(s)

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patrick.corless

Joined: 26/Oct/2004 00:00:00
Messages: 1982
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Outside of the system property org.icepdf.core.imageReference there isn't much else we have to improve image quality. If the images are large enough "smoothScaled" usually produces the best results. However if the images are larger then 7000x7000 we don't scale to save memory.
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schlenol

Joined: 17/Jun/2005 00:00:00
Messages: 17
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So there's no way to show the attached document in ICEpdf with roughly similar quality as Adobe Reader?
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patrick.corless

Joined: 26/Oct/2004 00:00:00
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Can you tell me a little about your environment as well has how you are using the library: Viewer RI or page capture?
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schlenol

Joined: 17/Jun/2005 00:00:00
Messages: 17
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We have the viewer ri embedded in our application (Java 1.8.0_131, Windows 7 Enterprise SP1), but I also opened the document directly with viewer ri (6.3-snapshot, OS).
The appearance of the document is identical in both cases and changes of "Preferences/Imaging/Image Reference Type" didn't make any difference.
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patrick.corless

Joined: 26/Oct/2004 00:00:00
Messages: 1982
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Thanks, I'll take a closer look for you and see if we can adjust anything on our end. Most of the image references config options were intended for black and white images. I"ll get back to you tomorrow.
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