Jakob Pyttlik created PDFBOX-2853:
-------------------------------------
Summary: CCITT: Background is rendered as transparent color
Key: PDFBOX-2853
URL: https://issues.apache.org/jira/browse/PDFBOX-2853
Project: PDFBox
Issue Type: Bug
Components: Rendering
Affects Versions: 1.8.9
Reporter: Jakob Pyttlik
CCITT-Images with colorspace different from PDIndexed are created using
{code title=PDCCitt.java/getRGBImage}
if (colorspace instanceof PDIndexed)
{
...
}
else
{
byte[] map = new byte[] { (byte) 0x00, (byte) 0xFF };
colorModel = new IndexColorModel(1, map.length, map, map, map,
Transparency.OPAQUE);
}
{code}
The value Transparency.OPAQUE (=1) is provided for the parameter
"transparentIndex" - this creates an image, in which the white color is treated
as transparent.
This bug is especially annoying for some OCR-documents I had to work with
(using PageDrawer). They consist of rendered text (as result of the OCR), that
has the original content as image rendered on top, fully covering the text.
When the white background is rendered as transparent, the rendered page gets
messed up, because both texts can be seen,
*Proposed Fix/Patch*
Replace the value *Transparency.OPAQUE* with *-1*, so that no color is
transparent.
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