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https://issues.apache.org/jira/browse/IMAGING-170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14804468#comment-14804468
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Gary Lucas edited comment on IMAGING-170 at 9/18/15 1:03 PM:
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This change turned out to be fairly easy. I added the predictor to Apache
Commons Imaging and ran your test image through the read/write process. The
original kwf00346.tif is uncompressed and has a file size of 3623 KB. When
stored with the existing LZW compression, it drops slightly to 3325 KB. WIth
the predictor, it's 2515 KB. Both LZW compressions occur without any loss of
data. The predictor result is only slightly larger than a PNG of the same
image would be.
Of course, now that Damjan pointed out that ExifWriter is a better solution for
you anyway, it probably doesn't matter.
Anyway, my changes would be ready to go as soon as I do more testing, but
there's an issue... It's been quite awhile since I've worked on this project,
and my development space is out-of-date. I need get it set up again. So it may
take me some time before I can get this code turned in.
was (Author: gwlucas):
This change turned out to be fairly easy. I added the predictor to Apache
Commons Imaging and ran your test image through the read/write process. The
image size for kwf00346.tiff drops from 3623 KB to 2515 KB without any loss of
data. It's only slightly larger than a PNG of the same image would be.
Of course, now that Damjan pointed out that ExifWriter is a better solution for
you anyway, it probably doesn't matter.
Anyway, my changes would be ready to go as soon as I do more testing, but
there's an issue... It's been quite awhile since I've worked on this project,
and my development space is out-of-date. I need get it set up again. So it may
take me some time before I can get this code turned in.
> TIFF image gains significant size using TiffImageWriterLossless
> ---------------------------------------------------------------
>
> Key: IMAGING-170
> URL: https://issues.apache.org/jira/browse/IMAGING-170
> Project: Commons Imaging
> Issue Type: Bug
> Components: Format: TIFF
> Affects Versions: 1.0
> Environment: System: Fedora release 21, kernel version:
> 3.18.7-200.fc21.x86_64, JAVA: openjdk version "1.8.0_31", IDE: Eclipse Kepler
> 2, Build id: 20140224-0627
> Reporter: Remigiusz Malessa
> Priority: Minor
> Attachments: kwf00346.tif
>
>
> Good afternoon,
> I am posting an issue report as suggested by mr Benedikt Ritter. It's my
> first issue report and I've just recently started using the Commons Imaging,
> so please go easy on me.
> ------------------------------------------------
> Using Commons Imaging I am reading a Tiff image (will attempt to attach it to
> this ticket), then I remove a tag (Focal Plane Resolution Unit) and then I
> save the new TiffOutputSet to the system using TiffImageWriterLossless.
> The original image is 15MB, the new image (with the Tag removed) is 28MB.
> Here's how I do it:
> {code:title=RemoveTag.java|borderStyle=solid}
> import java.awt.image.BufferedImage;
> import java.io.File;
> import java.io.FileOutputStream;
> import java.io.IOException;
> import java.io.OutputStream;
> import java.util.HashMap;
> import java.util.List;
> import java.util.Map;
> import org.apache.camel.Exchange;
> import org.apache.commons.imaging.ImageFormats;
> import org.apache.commons.imaging.ImageReadException;
> import org.apache.commons.imaging.ImageWriteException;
> import org.apache.commons.imaging.Imaging;
> import org.apache.commons.imaging.common.ImageMetadata;
> import org.apache.commons.imaging.formats.tiff.TiffField;
> import org.apache.commons.imaging.formats.tiff.TiffImageMetadata;
> import org.apache.commons.imaging.formats.tiff.write.TiffImageWriterLossless;
> import org.apache.commons.imaging.formats.tiff.write.TiffOutputDirectory;
> import org.apache.commons.imaging.formats.tiff.write.TiffOutputSet;
> File tInputFile = new File("/home/rem/TEMP/tags.original.tif");
> File toutputFile = new File("/home/rem/TEMP/tags.new.tif");
> final BufferedImage image = Imaging.getBufferedImage(tInputFile);
> ImageMetadata tMetadata = Imaging.getMetadata(tInputFile);
> TiffImageMetadata imageMetadata = (TiffImageMetadata) tMetadata;
> outputSet = imageMetadata.getOutputSet();
> TiffOutputDirectory exifDirectory = outputSet.getExifDirectory();
> exifDirectory.removeField(41488);
> ImageFormats format = ImageFormats.TIFF;
> Map<String, Object> params = new HashMap<String, Object>();
> BufferedImage image = Imaging.getBufferedImage(tInputFile);
> byte[] bytes = Imaging.writeImageToBytes(image, format, params);
> TiffImageWriterLossless writerLossLess = new TiffImageWriterLossless(bytes);
> writerLossLess.write(os, outputSet);
> {code}
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