How can I export/print an Email or a Document as an Image to Photos

Photos is not a good choice to manage files other than images. There are better digital asset management apps that can handle both images and various types of documents.

An good candidate for what you want to do is NeoFinder. It can use your current folder organization to maintain your documents, pdfs, images, etc. It have a free demo version you can try to see if it will suit your needs.

If you still want to use Photos you can create an Automator workflow app to convert PDF files into images for each page, sequently numbered. You can adjust the quality of the image within Automator.

Save it as an app and just drag PDFs onto it to create jpeg files for each page.

If you import the folder with the image files into it you can use the "Keep Folder Organization" feature to create an album with the image files in it and with the same name as the folder.

Using Photos will require converting every document to an image which can be a lot of work. NeoFinder only requires you to organize your documents of any kind in folders on your hard drive.

While this doesn't answer your question, you may consider three reasons Photos isn't ideal for this purpose:

• PDF documents usually take up considerably less space on disk than images
• PDF documents can comprise more than one page, while images have no concept of pages
• PDF documents are usually searchable because the text is stored as characters rather than pixels in an image