Hi, I think those glitches are related to the theme support which I haven't put too much effort in yet. The themes.pptx in our testdata repo shows also similar color issues.
If you like, you could start from the DrawPaint class and check where it goes
wrong.
Otherwise I'll have a look at your files, if you upload them to a bugzilla
entry,
but I can't promise you immediately fixes.
Andi
On 3/6/18 3:52 AM, fridayeva wrote:
> Hi,
>
> I am using 3.17, trying to convert a PPT file to PNG, but some page preview
> image is missing background colors while others work fine. Similar things
> happens for PPTX files. The image background theme is black but it is
> supposed to be blue.
>
> My code to generate page preview is :
>
> public BufferedImage pdPageToBufferedImage(int pageNumber, int height, int
> width) {
> BufferedImage img = new BufferedImage(width, height,
> BufferedImage.TYPE_INT_RGB);
> Graphics2D graphics = img.createGraphics();
> //here I give examples for PPT files, for PPTX it is XSLFSlide instead of
> HSLFSlide, rest code is same.
> HSLFSlide slide = presentation.getSlides().get(pageNumber);
> graphics.setPaint(Color.white);
> graphics.fill(new Rectangle2D.Float(0, 0, width, height));
> slide.draw(graphics);
> return img;
> }
>
>
> Also, I have attached the two comparison images to show the difference. Left
> is png view, and right is powerpoint view.
>
> <http://apache-poi.1045710.n5.nabble.com/file/t340536/diff1.png>
>
>
>
> <http://apache-poi.1045710.n5.nabble.com/file/t340536/diff3.png>
>
> Thanks.
>
>
>
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