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https://issues.apache.org/jira/browse/PDFBOX-1022?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Roland Quast updated PDFBOX-1022:
---------------------------------
Attachment: tast_bb.pdf
An example of an incorrect image with PDIndexed colorspace.
> PDPage convertToImage creates inverted black and white image for indexed
> colorspace.
> ------------------------------------------------------------------------------------
>
> Key: PDFBOX-1022
> URL: https://issues.apache.org/jira/browse/PDFBOX-1022
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 1.5.0
> Environment: Java 1.6, Windows 7.
> Reporter: Roland Quast
> Attachments: tast_bb.pdf
>
>
> The attached PDF file demonstrates that line 178 of PDPixelMap.java does not
> try to determine what is the black value and what is the white value. The
> colorspace of the attached PDF file is PDIndexed.
> Inverting this value makes the file render correctly, but there needs to be
> some kind of way to determine what is black/white for a PDIndexed colorspace.
> 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 if (colorspace instanceof PDICCBased)
> {
> if ( ((PDICCBased)colorspace).getNumberOfComponents() ==
> 1)
> {
> map = new byte[] {(byte)0xff};
> }
> else
> {
> map = new byte[] {(byte)0x00, (byte)0xff};
> }
> }
> else
> {
> map = new byte[] {(byte)0x00, (byte)0xff}; // <---
> HAPPENS HERE - NO TEST FOR BLACK/WHITE LIKE OTHER CASES ABOVE.
> }
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