Image is broken if interpolate is set to false in generated pdf

Hi @danfickle I'm trying to render a pdf which contains images more exactly some barcodes.
Initially I tried to render with interpolate set to true and I got blurry image. See (Picture_with_interpolate_true.pdf)
After I did some research I found your post in which you recommended to set interpolate to be false (image-rendering: pixelated;) I entered in debug mode and I saw that in PdfBoxSlowOutputDevice.class:712 PDImageXObject is set to true.
As result the image is broken. See (Picture_with_pixelated.pdf)
I have attached two pdfs with both cases.
I used version: '0.0.1-RC20' from 'openhtmltopdf-pdfbox'.
The image was created with code bellow :

````
private static String generateInterleafed25Image(String barcodeNumber) throws IOException {
BarcodeInter25 barcode = new BarcodeInter25();
barcode.setCode(barcodeNumber);
Image awtImage = barcode.createAwtImage(Color.BLACK, Color.WHITE);

BufferedImage newImage = new BufferedImage(
awtImage.getWidth(null), awtImage.getHeight(null),
BufferedImage.TYPE_INT_ARGB);
Graphics2D g = newImage.createGraphics();

g.drawImage(awtImage, 0, 0, null);
g.dispose();

ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(newImage, "png", baos);
baos.flush();

byte[] imageInByte = baos.toByteArray();
baos.close();
return Base64.getEncoder().encodeToString(imageInByte);
}
````

Thank you!

[Picture_with_interpolate_true.pdf](https://github.com/danfickle/openhtmltopdf/files/3272094/Picture_with_interpolate_true.pdf)
[Picture_with_pixelated.pdf](https://github.com/danfickle/openhtmltopdf/files/3272095/Picture_with_pixelated.pdf)