Jesse Long created PDFBOX-4300:
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Summary: Reduce im memory buffers when creating grayscale images
Key: PDFBOX-4300
URL: https://issues.apache.org/jira/browse/PDFBOX-4300
Project: PDFBox
Issue Type: Improvement
Components: PDModel
Affects Versions: 2.0.11
Reporter: Jesse Long
LosslessFactory uses ByteArrayOutputStreams when creating PDF image data.
First, it creates a BAOS in which to store the data, then a BAOS in which to
store the flate encoded data. Finally the flate encoded data is written to the
PDImageXObject's stream.
We could instead create an empty PDStream, give it a filter, and write the
image data directly into the stream. We then instantiate a PDImageXObject
giving it the already created stream.
This would dramatically reduce RAM requirement if a scratchfile is in play.
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