How do get an image in a Mail signature to render sharp?

I have never seen those options in creating signatures under preferences in Mail. I resized the graphic to 200x86 @300 dpi.

My apologies. I meant to say ppi. Anyway, I don’t think you understand my issue. This is an issue which did not used to occur, then started occurring somewhere about El Capitan. It has been discussed in the past. I was trying to see if anyone had found a solution. When I attach an image inline to an email I use the small, medium, large, actual dropdown to size appropriately.

I am referring to using an image in the preset signature in Mail. They are found at Mail>Preferences>Signatures. You can create multiple standard email signatures to be used across multiple email accounts. You do not have to scale when composing because they are preset. In the past when you added a graphic file to your preset signature it would display properly. It does not do so now. Perhaps you could try it for yourself and see if you can recreate my problem.

In general this would be true. However it does not apply in this case. A 300 dpi .png while sharp when opened, renders “fuzzy” in the Mail signatures.

It appears as if it is in very low resolution on screen as I compose, printed & to the recipient. It is as if Mail downsizes the image in creating the signature.

Joel