300dpi images in HTML seem to be reset to screen resolution

I am using Aspose.Words to create documents containing several graphs. The complete content of the Word document is created through a WYSIWYG editor. The graphs are nothing more then JPG images at schreen resolution. When creating the Word document, I replace all 72 dpi images within the HTML by 300 dpi versions. When viewing the resulting document after InsertHTML the images look huge. It seems like the resolution of these images has been set back to 72 dpi.

Thank you for considering Aspose.
As I can see you are replacing some images with others programmatically. Have you tried to set their size? Please provide the code snippet operating with Aspose.Words and a sample document. The case is not quite clear.