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https://issues.apache.org/jira/browse/PDFBOX-2917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14660211#comment-14660211
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Tilman Hausherr commented on PDFBOX-2917:
-----------------------------------------
I did some more tests:
- changing the two /GS objects to contain nothing: bad rendering
- change the colorspace of /X36 to /DeviceCMYK instead of icc: OK rendering
So it is something only related to the image and its colorspace.
I looked where the ICC profile is used, which is PDColorSpace.toRGBImageAWT(),
and changed this:
{code}
ColorConvertOp op = new ColorConvertOp(null);
op.filter(src, dest);
{code}
to this "simple" method:
{code}
for (int x = 0; x < raster.getWidth(); ++x)
for (int y = 0; y < raster.getHeight(); ++y)
dest.setRGB(x, y, src.getRGB(x, y));
{code}
or this
{code}
Graphics g = dest.getGraphics();
g.drawImage(src, 0, 0, null);
g.dispose();
{code}
and now the file renders properly. I then ran all the tests, there are many
slight changes. I looked closely at PDFBOX-2128-PORSCHE_CMYK.pdf, the car
images look slightly nicer with the "simple" convert method. The old rendering
has the images slightly too light. Another: for the file bugzilla867751.pdf,
the old version has two large rectangles on page 1 (best seen at the bottom
right), which cannot be seen in the new version, i.e. the version with the
simple conversion is better.
> PDF to Image, faint/dim Images
> ------------------------------
>
> Key: PDFBOX-2917
> URL: https://issues.apache.org/jira/browse/PDFBOX-2917
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.0
> Environment: Windows 8.1, jdk1.8.0_51, jre1.8.0_51
> Reporter: Samuil Goranov
> Priority: Trivial
> Labels: images, newbie
> Attachments: saved0.png, selection.pdf
>
>
> {code:title=pdftoimage.java|borderStyle=solid}
> PDDocument document = null;
> File file = new File("F:\\Projects\\java\\pdfbox\\complete.pdf");
> document = PDDocument.load( file );
> try {
> // retrieve image
> BufferedImage bi = new PDFRenderer(document).renderImageWithDPI(
> 0 , 150, ImageType.RGB );
> File outputfile = new File("saved0.png");
> ImageIO.write(bi, "png", outputfile);
> } catch (IOException e) {
> }
> {code}
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