I don't know if this helps at all, but I've always resized my images by adding, for example..

https://steemitimages.com/407x271/

on the front of the url.

Examples...

Original..


Altered..


Then I adjust it (the pixel size)to the particular size I want. Doesn't help with the picture quality, but I can get a larger or smaller picture in my post. It only shrinks my pic's in comments. I have no luck getting a larger picture in comments using this method.

I apologize in advance is what I say here is mute. If so just ignore ;-}