com.aspose.words

Example:

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

builder.getParagraphFormat().setStyle(doc.getStyles().get("Heading 1"));
builder.writeln("Hello world!");
builder.insertImage(getImageDir() + "Logo.jpg");

Assert.assertTrue(new File(getImageDir() + "Logo.jpg").length() < 21000);

// When we save the document as an image, we can pass a SaveOptions object to
// select a pixel format for the image that the saving operation will generate.
// Various bit per pixel rates will affect the quality and file size of the generated image.
ImageSaveOptions imageSaveOptions = new ImageSaveOptions(SaveFormat.PNG);
imageSaveOptions.setPixelFormat(imagePixelFormat);

// We can clone ImageSaveOptions instances.
Assert.assertNotEquals(imageSaveOptions, imageSaveOptions.deepClone());

doc.save(getArtifactsDir() + "ImageSaveOptions.PixelFormat.png", imageSaveOptions);

switch (imagePixelFormat) {
    case ImagePixelFormat.FORMAT_1_BPP_INDEXED:
        Assert.assertTrue(new File(getArtifactsDir() + "ImageSaveOptions.PixelFormat.png").length() <= 10000);
        break;
    case ImagePixelFormat.FORMAT_16_BPP_RGB_555:
    case ImagePixelFormat.FORMAT_32_BPP_RGB:
    case ImagePixelFormat.FORMAT_48_BPP_RGB:
        Assert.assertTrue(new File(getArtifactsDir() + "ImageSaveOptions.PixelFormat.png").length() < 156000);
        break;
    case ImagePixelFormat.FORMAT_24_BPP_RGB:
        Assert.assertTrue(new File(getArtifactsDir() + "ImageSaveOptions.PixelFormat.png").length() < 146000);
        break;
}