从pptx转换为图像时出现渐变颜色问题。 Apache POI

Question

我已经使用apache poi为图像创建了pptx和ppt转换器，但是在转换某些文件时，经过两次或三次转换后出现了异常。

线程“ main”中的异常java.lang.IllegalArgumentException：颜色参数超出预期范围：红色

pptx和ppt的主转换器

 import org.apache.poi.hslf.model.Slide;
import org.apache.poi.hslf.usermodel.SlideShow;
import org.apache.poi.xslf.usermodel.XMLSlideShow;
import org.apache.poi.xslf.usermodel.XSLFSlide;

import java.awt.*;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;

public class Application {


    public static void main(String[] args) throws Exception {

        System.out.println("working");

        String directory = System.getProperty("user.home") + "/Desktop/";

        //creating an empty presentation
        File file=new File(directory + "test6.pptx");
        String fileName = file.getName();
        // Identify the file whether it is ppt or pptx
        String extension = fileName.substring(fileName.lastIndexOf(".") + 1);

        FileInputStream inputStream = new FileInputStream(directory +  fileName);

        if (extension.equals("pptx")) {


            XMLSlideShow pptx = new XMLSlideShow(inputStream);

            //getting the dimensions and size of the slide
            Dimension pgsize = pptx.getPageSize();
            java.util.List<XSLFSlide> pptxSlide = Arrays.asList(pptx.getSlides());

            for (int i = 0; i < pptxSlide.size(); i++) {
                BufferedImage img = new BufferedImage(pgsize.width, pgsize.height,BufferedImage.TYPE_INT_RGB);

                Graphics2D graphics = createImage(img, pgsize);
                //render
                pptxSlide.get(i).draw(graphics);
                graphics.setComposite(AlphaComposite.DstOver);
                graphics.setPaint(Color.WHITE);

                //creating an image file as output
                imageFile(i, img);


                graphics.dispose();

            }


        }else if(extension.equals("ppt")){


            SlideShow ppt = new SlideShow(inputStream);

            //getting the dimensions and size of the slide
            Dimension pgsize = ppt.getPageSize();
            List<Slide> slide = Arrays.asList(ppt.getSlides());

            for (int i = 0; i < slide.size(); i++) {
                BufferedImage img = new BufferedImage(pgsize.width, pgsize.height,BufferedImage.TYPE_INT_RGB);

                //render
                slide.get(i).draw(createImage(img, pgsize));


                //creating an image file as output
                imageFile(i, img);
            }
        }else {
            throw new Exception("Not compatible type ");
        }
    }

    private static void imageFile(int i, BufferedImage img) throws IOException {
        FileOutputStream out = new FileOutputStream("ppt_image_" + i + ".png");
        javax.imageio.ImageIO.write(img, "png", out);
        System.out.println("Image successfully created");
        out.close();
    }


    private static Graphics2D createImage(BufferedImage img, Dimension pgsize){
        Graphics2D graphics = img.createGraphics();

        //clear the drawing area
        graphics.setPaint(Color.white);
        graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
        // default rendering options
        graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        graphics.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        graphics.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
        graphics.setComposite(AlphaComposite.DstOver);


        return graphics;
    }
}

  

主要问题是我想将任何具有渐变色或简单颜色的pptx文件转换为图像。

已转换的渐变幻灯片[灰色]