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https://issues.apache.org/jira/browse/PDFBOX-2435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14175883#comment-14175883
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Tilman Hausherr commented on PDFBOX-2435:
-----------------------------------------
The decode array is also used in PDPixelMap. However changing the handling like
in PDCcitt has no effect on the rendering of 415 test files. This code segment
{code}
else if (bpc == 1)
{
byte[] map = null;
if (colorspace instanceof PDDeviceGray)
{
COSArray decode = getDecode();
// we have to invert the b/w-values,
// if the Decode array exists and consists of (1,0)
if (decode != null && decode.getInt(0) == 1)
{
map = new byte[] {(byte)0xff};
}
else
{
map = new byte[] {(byte)0x00, (byte)0xff};
}
}
else
{
map = new byte[] {(byte)0x00, (byte)0xff};
}
cm = new IndexColorModel(bpc, map.length, map, map, map,
Transparency.OPAQUE);
}
{code}
does the same, regardless which map type is created. There is a comment in
CCITTFaxFilter that IndexColorModel is unreliable.
Although a change apparently does no harm, I prefer to leave it as it is to
avoid any surprise.
> ConvertToImage Appears To Invert Colors
> ---------------------------------------
>
> Key: PDFBOX-2435
> URL: https://issues.apache.org/jira/browse/PDFBOX-2435
> Project: PDFBox
> Issue Type: Bug
> Components: Writing
> Affects Versions: 1.8.7, 1.8.8
> Reporter: lufeng
> Assignee: Tilman Hausherr
> Labels: CCITTFaxDecode, regression
> Fix For: 1.8.8
>
> Attachments: 123.PDF, 123.png, screenshot-1.png
>
>
> the colors are reversed when I call convertToImage API in PDPage class.
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