I donât know what do you mean by pdf image, but if you want to simply convert pdf to an image you can easily do so. There are several applications to do that. For example, you can import the pdf page to Inkscape and then save the document as a png. There are other applications also, like libre office draw, etc. I think most of the drawing software can import pdf and then you can save as image. You can even take a screenshot of the page and save it.
Just for the record, I am not a professional photographer. None of this knowledge is particularly useful to anybody making or buying images. I am very much interested in the details behind the compression, and it is my wish to make this information free of charge. Please do not ask me for this information for any fee. I make this information free to show and to give. Please feel free to link this page anywhere (including any place you see this line about this page).