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https://issues.apache.org/jira/browse/PDFBOX-2302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Hewson updated PDFBOX-2302:
--------------------------------
Attachment: mori-cvpr01.pdf
The attached PDF file shows that when the "Interpolate" flag is not set, then
non-interpolated rendering is required for correct rendering of some PDFs.
Despite the fact that the spec says that a conforming reader "may use any
specific
implementation of interpolation that it wishes".
> Make better use of RenderingHints
> ---------------------------------
>
> Key: PDFBOX-2302
> URL: https://issues.apache.org/jira/browse/PDFBOX-2302
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.0
> Reporter: John Hewson
> Assignee: John Hewson
> Priority: Minor
> Attachments: mori-cvpr01.pdf
>
>
> PageDrawer doesn't make effective use of Java 2D's RenderingHints. The
> situation now is a little odd due to code having been moved around and copied
> and pasted. Most of the time we're not making use of higher quality
> renderings which are available to us.
> Some examples of strangeness:
> - drawTilingPattern sets VALUE_FRACTIONALMETRICS_ON, yet this applies only to
> AWT fonts
> - drawGlyph2D sets VALUE_ANTIALIAS_ON but strokePath and fillPath set it to
> VALUE_ANTIALIAS_OFF
> - drawBufferedImage sets KEY_INTERPOLATION to
> VALUE_INTERPOLATION_NEAREST_NEIGHBOR which is the lowest quality image
> scaling method
> - shadingFill sets VALUE_ANTIALIAS_OFF (but that might make more sense
> because we're Paint-ing these ourselves, OTOH if the canvas is buffered
> already for anti-aliasing do we save anything by disabling it?)
> - drawPage sets VALUE_ANTIALIAS_ON but this is always overridden by the
> various drawing methods
> Currently we're missing out on anti-aliasing for paths (other than glyphs)
> and we're getting low-quality resizing of images, which makes Type 3 fonts
> look particularly ugly. Setting the appropriate rendering hints would improve
> this greatly.
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