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https://issues.apache.org/jira/browse/PDFBOX-5171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17326728#comment-17326728
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Tilman Hausherr commented on PDFBOX-5171:
-----------------------------------------
Yes, it's that one.
> Slow PDColorSpace.toRGBImageAWT when processing many pixel sized chuncks
> ------------------------------------------------------------------------
>
> Key: PDFBOX-5171
> URL: https://issues.apache.org/jira/browse/PDFBOX-5171
> Project: PDFBox
> Issue Type: Bug
> Reporter: Oliver Schmidtmer
> Priority: Major
> Attachments: EloPdfPrint_20210420132413502.pdf
>
>
> The attached PDF has a table which is embedded as an image.
> This image is processed in PDColorSpace.toRGBImageAWT(...) as
> many little chuncks of mostly 1x1 or 2x1 pixels and takes very long.
> When changing the function from a ColorConvertOp to drawing this is much
> faster (~2s vs. ~60s). It seems for many small images the ColorConvertOp has
> a big overhead.
> So I propose to change the implementation to:
> {code:java}
> protected BufferedImage toRGBImageAWT(WritableRaster raster, ColorSpace
> colorSpace)
> {
> //
> // WARNING: this method is performance sensitive, modify with care!
> //
> // ICC Profile color transforms are only fast when performed using
> ColorConvertOp
> ColorModel colorModel = new ComponentColorModel(colorSpace, false,
> false,
> Transparency.OPAQUE, raster.getDataBuffer().getDataType());
> BufferedImage src = new BufferedImage(colorModel, raster, false,
> null);
> BufferedImage dest = new BufferedImage(raster.getWidth(),
> raster.getHeight(),
> BufferedImage.TYPE_INT_RGB);
> Graphics2D g2d = (Graphics2D) dest.getGraphics();
> g2d.drawImage(src, 0, 0, null);
> g2d.dispose();
> return dest;
> }
> {code}
> or
> {code:java}
> protected BufferedImage toRGBImageAWT(WritableRaster raster, ColorSpace
> colorSpace)
> {
> //
> // WARNING: this method is performance sensitive, modify with care!
> //
> // ICC Profile color transforms are only fast when performed using
> ColorConvertOp
> ColorModel colorModel = new ComponentColorModel(colorSpace, false,
> false,
> Transparency.OPAQUE, raster.getDataBuffer().getDataType());
> BufferedImage src = new BufferedImage(colorModel, raster, false,
> null);
> BufferedImage dest = new BufferedImage(raster.getWidth(),
> raster.getHeight(),
> BufferedImage.TYPE_INT_RGB);
> if (src.getWidth() > 1 && src.getHeight() > 1)
> {
> ColorConvertOp op = new ColorConvertOp(null);
> op.filter(src, dest);
> }
> else
> {
> Graphics2D g2d = (Graphics2D) dest.getGraphics();
> g2d.drawImage(src, 0, 0, null);
> g2d.dispose();
> }
> return dest;
> }
> {code}
> if the ColorConvertOp is still faster in the normal case.
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