That solution is nice, but I have a couple of small problems:
Tumblr's RSS refers to small preview images.
I want the large version.
I want to skip entries without images.
InoReader can do that. However …
I want to skip small images.
InoReader can't do that.
I want to skip GIFs: they're small, low-quality, and rarely interesting.
InoReader can't do that either.
Thus, let's build a couple of workarounds!
I've parked the sources in a gist for you.
This small Python script scans one of my InoReader foldersm marking all entries as read which I want to skip.
This is a Greasemonkey / Tampermonkey script. It replaces all links to Tumblr preview images with the "large" version.
The whole thing needs a couple of API keys. There's no API to fetch these, so you need to do it yourself. The start of ino_mark_read.py tells you where to find them.