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https://issues.apache.org/jira/browse/PDFBOX-4285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16570481#comment-16570481
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Alexandre Moraes do Nasciment commented on PDFBOX-4285:
-------------------------------------------------------
The only thing that I changed to test the JPEG compression was in the
setCompressionType function in TIFFUtil class.
{code:java}
// code placeholder
public static void setCompressionType(ImageWriteParam param, BufferedImage
image){
// avoid error: first compression type is RLE, not optimal and incorrect for
color images
// TODO expose this choice to the user?
if (image.getType() == BufferedImage.TYPE_BYTE_BINARY &&
image.getColorModel().getPixelSize() == 1)
{
param.setCompressionType("CCITT T.6");
}
else
{
param.setCompressionType("JPEG");
}
}
{code}
But the TiffImageWriter that I´m using is from the package
com.sun.media.imageioimpl.plugins.tiff.TIFFImageWriter. I don´t know if the
implementation is different ffrom the com.github.jaiimageio package.
Here is the dependency that I used:
<dependency>
<groupId>javax.media</groupId>
<artifactId>jai_imageio</artifactId>
<version>1.1.1</version>
</dependency>
from this repository:
<repository>
<id>Geotoolkit</id>
<name>Geotoolkit</name>
<url>http://maven.geotoolkit.org/</url>
</repository>
> Expose the tiff compression type to the user.
> ---------------------------------------------
>
> Key: PDFBOX-4285
> URL: https://issues.apache.org/jira/browse/PDFBOX-4285
> Project: PDFBox
> Issue Type: Improvement
> Components: Writing
> Affects Versions: 2.0.11
> Reporter: Alexandre Moraes do Nasciment
> Priority: Major
> Labels: TIFF
>
> Allow the user to set the compression type of Tiff files externally.
> In the current version, the class ImageIOUtil uses
> TIFFUtil.setCompressionType and this sets the compression only to "CCITT T.6"
> or "LZW".
> Other choice could be allow the jpeg compression that is more efficient.
> It already has a TODO in code (// TODO expose this choice to the user?)
> Thank you.
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