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https://issues.apache.org/jira/browse/PDFBOX-1445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496387#comment-13496387
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Andreas Lehmkühler commented on PDFBOX-1445:
--------------------------------------------
The idea is to replace your code with the code from PDPixelMap and remove the
code from PDPIxelMap. So that the ImageMask stuff will be used with all kind of
PDXObjectImages (PixelMap, Ccitt and Jpeg). WDYT
> /ImageMask true does not work. Patch included.
> ----------------------------------------------
>
> Key: PDFBOX-1445
> URL: https://issues.apache.org/jira/browse/PDFBOX-1445
> Project: PDFBox
> Issue Type: Bug
> Reporter: Dave Smith
>
> I have the following pdf...
> 10 0 obj
> <<
> /Type /Page
> /MediaBox [ 0 0 612.0 792.0 ]
> /Parent 3 0 R
> /Resources << /XObject << /Obj4 4 0 R /Obj5 5 0 R /Obj6 6 0 R /Obj7 7 0 R >>
> /ProcSet [ /PDF /Text /ImageB /ImageC /ImageI ] >>
> /Contents [ 8 0 R 9 0 R ]
> >>
> endobj
> Which then draws 4 images. The first one is a "base" and then rest are image
> masks
> 9 0 obj
> << /Filter /FlateDecode /Length 121 >>
> stream
> q
> 612.00 0 0 792.00 0.00 0.00 cm
> /Obj4 Do
> Q
> q
> 0.129 g
> 524.16 0 0 556.80 48.00 127.68 cm
> /Obj5 Do
> Q
> q
> 0.302 g
> 220.80 0 0 398.40 48.00 286.08 cm
> /Obj6 Do
> Q
> q
> 0.204 g
> 524.16 0 0 469.44 48.00 185.28 cm
> /Obj7 Do
> Q
> endstream
> endobj
> 4 0 obj
> << /Type /XObject /Subtype /Image /Width 1275 /Height 1650 /BitsPerComponent
> 8
> /ColorSpace /DeviceGray /Filter [ /FlateDecode /DCTDecode ] /Length 50485 >>
> stream
> endstream
> endobj
> 5 0 obj
> << /Type /XObject /Subtype /Image /Width 2184 /Height 2320 /BitsPerComponent
> 1
> /ImageMask true /Filter /CCITTFaxDecode /DecodeParms << /K -1 /Columns 2184
> >>
> /Length 15580 >>
> stream
> etc ...
> The current code simply treats the imagemask as an image. Since this is just
> a 1 bit image it has no Alpha channel it overwrites the existing image and we
> simply get the last image drawn.
> In
> org.apache.pdfbox.util.operator.pagedrawer.Invoke.java
> method
> public void process(PDFOperator operator, List<COSBase> arguments) throws
> IOException
> after
> if (awtImage == null)
> {
> LOG.warn("getRGBImage returned NULL");
> return;//TODO PKOCH
> }
> If you add the following code it fixes the problem. I can not provide the
> sample doc due to privacy reasons.
> /**
> * Spec 8.9.6.2
> * If ImageMask is true then the image is one bit. Black
> means draw the current colour and white means use the colour on the current
> image (ie Mask).
> * Convert the map to an image with an Alpha channel so we
> can lay it on top
> */
> if(image.getImageMask())
> {
> Color currentColour =
> drawer.getGraphicsState().getStrokingColor().getJavaColor();
> final int onColour = 0xff000000 |
> currentColour.getRGB();
> BufferedImage bia = new
> BufferedImage(awtImage.getWidth(),awtImage.getHeight(),BufferedImage.TYPE_INT_ARGB);
> for(int y=0;y<awtImage.getHeight();y++)
> {
> for(int x=0;x<awtImage.getWidth();x++)
> {
> bia.setRGB(x, y, (awtImage.getRGB(x, y)
> & 0x00ffffff) == 0xffffff ? 0x00ffffff : onColour);
> }
> }
> awtImage = bia;
> }
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