I have a page with the following styles:

@page {
        background: url(data:image/jpg;base64, --ENCODED IMG--) no-repeat 0 0;
        background-image-resolution: 300dpi, 300dpi;
        margin: 58mm 10mm 29mm 10mm !important;
        size: A4;
}

Encoded image is 794x1124px@300dpi.
No matter what value used for dpi, in output pdf the background is of very bad quality.
Is there a workaround of this problem?
PrinceXml version 8.0

Prince includes the images you supply; the background-image-resolution property can only change the size they appear on the page. If you need a better quality image with more pixels, you will need to find one and supply it to Prince.