com.aspose.words

Example:

Document doc = new Document(getMyDir() + "Images.docx");

// Create a "PdfSaveOptions" object that we can pass to the document's "Save" method
// to modify how that method converts the document to .PDF.
// Set the "ColorMode" property to "Grayscale" to render all images from the document in black and white.
// The size of the output document may be larger with this setting.
// Set the "ColorMode" property to "Normal" to render all images in color.
PdfSaveOptions pdfSaveOptions = new PdfSaveOptions();
{
    pdfSaveOptions.setColorMode(colorMode);
}

doc.save(getArtifactsDir() + "PdfSaveOptions.ColorRendering.pdf", pdfSaveOptions);