Large images are split in two

I am using PDF Creator v1.7.2 and have come across some strange behaviour regarding the generation of embedded images with large dimensions.

If I convert a Word document (doc or docx format) containing an image with a height approximately greater than 810 pixels (1062x1501 in this case), in the resultant PDF the image is split - although it appears as one image, simple highlighting shows it is now two images. For a similar image but with dimensions 665x754, the image is not split.

I noticed this as I take the resultant PDF and extract the images from it. I am only expecting one image to be extracted but instead, I receive two.

Has anyone seen this behaviour before and if so, how do I configure PDF Creator to not split the image up.

Thanks in advance

James