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https://issues.apache.org/jira/browse/IMAGING-126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910778#comment-13910778
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Gary Lucas commented on IMAGING-126:
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I don't have a solution just yet, but I may have an idea...
Can you include a code snippet showing which of the Apache Commons imaging
API's you are using to do your writing? Are you using the main Imaging class,
or one of the internal format-specific image writers?
I might have some insight in terms of TIFF images. I'm not sure about PNGs.
The original authors of the API set up their method calls so that you would
pass in a HashMap containing options for storing files. Unless you pass in an
option for data compression, it isn't applied (at least for TIFFs, I am not
sure about PNGs).
To make that happen, you need to pass in a compression parameter into the
writeImage call. The following is what I do in my ow code which uses one
of the internal TiffWriter classes. You could probably do something analogous
if you were using the main Image class.
HashMap<String, Object> params = new HashMap<String, Object>();
params.put(ImagingConstants.PARAM_KEY_COMPRESSION,
new Integer(TiffConstants.TIFF_COMPRESSION_LZW));
TiffimageWriterLossy tiffWriter = new TiffImageWriterLossy(eTiffByteOrder);
tiffWriter.writeImage(outputImage, outputFileStream, params);
> TIFF and PNG images should not be bigger than the ones created by java ImageIO
> ------------------------------------------------------------------------------
>
> Key: IMAGING-126
> URL: https://issues.apache.org/jira/browse/IMAGING-126
> Project: Commons Imaging
> Issue Type: Improvement
> Components: Format: PNG, Format: TIFF
> Affects Versions: 1.0
> Environment: W7
> Reporter: Tilman Hausherr
> Priority: Minor
> Attachments: pdfbox-1870-devicen3-01.png,
> pdfbox-1870-devicen3-01.tif, pdfbox-1870-devicen3.pdf-1.png,
> pdfbox-1870-devicen3.pdf-1.tif
>
>
> I tried to use Apache Imaging for the PDFBOX project (PDFBOX-1734) because of
> problems with setting the tiff resolution in java imageio.
> While the code is pretty nice, I found that the generated images are
> sometimes much bigger in size than the ones generated by java imageio.
> Example:
> pdfbox-1870-devicen3-01.png 50 KB (imageio)
> pdfbox-1870-devicen3.pdf-1.png 70 KB (imaging)
> pdfbox-1870-devicen3-01.tif 401 KB (imageio)
> pdfbox-1870-devicen3.pdf-1.tif 1063 KB (imaging)
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