Bad quality in signature inserted through Adobe Reader DC

Hi, i have a template of a document that i need to sign and send every now and then so i decided to leave the old print-sign-scan technic and go to the electronic signature using Adobe Acrobat Reader DC, it works but when i add an image of my signature the image added look awful, it seems like it was transformed to jpg with a lot of artifacs.

My original image is a 32 bits png from an scanned signature i did in white paper, and then using photoshop c6 i replaced the white background with transparency, this image looks great by its own, why is adobe getting so low quality when added to a pdf?

I have made this but the problem persist: https://answers.acrobatusers.com/Is-f...

The same happens in the ios mobile app. Thanks in advance!

gerardo garcia