我试图使用J / Link从Mathematica获取图像到

Java.我可以在Mathematica中打印图像,如下所示：

Print[ Graphics[Raster[ img[[1]] ], AspectRatio->Automatic, ImageSize->530 ] ];

我试过以各种方式从Mathematica函数返回数据：

Return [ Image[Graphics[Raster[ img[[1]] ], AspectRatio->Automatic, ImageSize->530 ]] ];

Return [ Graphics[Raster[ img[[1]] ], AspectRatio->Automatic, ImageSize->530 ] ];

Return [ Raster[ note1[[1]] ] ];

Return [ note1[[1]] ];

我的Java代码：

ml.evaluate("tmp = renderImageGeneric[" + sampleId + ", noteText," + sizeX + "," + sizeY + ", margin," + dpi + "," + lineStep + "," + tabStep + "," + ligatureMatch + "," + maxLigHeightDiff + "," + mmSearch + "," + highToLowGap + "," + lowToHighGap + "," + wordBaselineVariance + "," + debugFlag + "]");

ml.discardAnswer();

byte[] res = ml.evaluateToImage("tmp", 0, 0);

ByteArrayInputStream strm = new ByteArrayInputStream(res);

BufferedImage imag = ImageIO.read(strm);

//BufferedImage imag = ImageIO.read(new InputStream(res));

if(imag != null) {

ImageIO.write(imag, "png", new File("/Users/Rebecca/","test.png"));

}else {

System.out.println("image is null");

}

调试时,我在res中得到一个大字节数组.图像确实被保存,但它是空白的(即白色图像).

如果我只返回一个字符串(“蓝色”),则会保存带有蓝色字符串的图像.

我假设我需要在renderImageGeneric中返回不同的东西,但我无法弄清楚是什么.

谢谢！