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https://issues.apache.org/jira/browse/PDFBOX-5464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17557024#comment-17557024
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Tilman Hausherr commented on PDFBOX-5464:
-----------------------------------------
I suspect that something is wrong in PDSeparation.toRGBImage(WritableRaster
raster). The JPEG image itself is OK, it is a grey jpeg with a separation
colorspace.
The separation colorspace seems OK when displayed in PDFDebugger (blue). That
separation colorspace has a an ICC colorspace as alternate colorspace, but that
ICC colorspace is a LAB space.
Some of the values returned by tintTransform() are negative, and/or larger than
255, which is unusual, and I don't know if these values are properly stored in
"altRaster".
I was able to get it to work by using toRGB(). But this is only a proof of
concept, I don't know what's wrong.
{code}
public BufferedImage toRGBImage(WritableRaster raster) throws IOException
{
if (alternateColorSpace instanceof PDLab)
{
// PDFBOX-3622 - regular converter fails for Lab colorspaces
return toRGBImage2(raster);
}
int width = raster.getWidth();
int height = raster.getHeight();
float[] samples = new float[1];
BufferedImage bim = new BufferedImage(raster.getWidth(),
raster.getHeight(), BufferedImage.TYPE_INT_RGB);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
raster.getPixel(x, y, samples);
samples[0] /= 255.0;
float[] toRGB = toRGB(samples);
bim.setRGB(x, y, ((int) (toRGB[0] * 255)) << 16 | ((int)
(toRGB[1] * 255)) << 8 | ((int) (toRGB[2] * 255)));
}
}
return bim;
}
{code}
> White areas are rendered red when converting a pdf to png with pdfbox
> ---------------------------------------------------------------------
>
> Key: PDFBOX-5464
> URL: https://issues.apache.org/jira/browse/PDFBOX-5464
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.26, 3.0.0 PDFBox
> Reporter: Kirovj
> Priority: Major
> Attachments: err1-1.png, err1-2.png, err1-3.png, err1.pdf
>
>
> hi
> This may be a problem similar to PDFBOX-4470 Red areas around text when
> converting a pdf to png with pdfbox - ASF JIRA (apache.org)
> When I convert a pdf to png files with pdfbox, I find that the backgroud
> White color was rendered as Red. And this is unusual, I have only one pdf
> rendered like this. But in this pdf, almost all pages are rendered as Red
> color.
> Here's some of the code that I'm using:
> {code:java}
> try (PDDocument document = PDDocument.load(new File("example/" + file +
> ".pdf"))) {
> int numberOfPages = document.getNumberOfPages();
> PDFRenderer renderer = new PDFRenderer(document);
> for (int i = 0; i < numberOfPages; i++) {
> System.out.println("render " + i);
> BufferedImage bufferedImage = renderer.renderImage(i, 2,
> ImageType.RGB);
> ImageIO.write(bufferedImage, "png", new File("example/" + file + "-"
> + i + ".png"));
> }
> } {code}
> I also tried pdfbox 3.0.0-RC1, but result is the same.
> The red png files start at pdf page 3.
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