I have personally been in a very similar situation myself, in the print industry. There are a few very important things you should keep in mind going into your new job, which would have helped me had I known them earlier.
Your Job Is Not Resizing Images
It may very well be that your employers need to have images resized to allow them to do their work. In the print industry, I can say with authority that this is pretty well a universally encountered job task, particularly in areas of design and "pre-press technician" roles (I've done both, and more).
The first task you have at a new job is to learn what they need from you, and how to do that specific job - and do it extremely well. Do the job with high quality, and learn to do it as quickly as is deemed necessary in your position.
By all means, use tools to help you do your job, but please remember: they are just tools to help you do your job. If a tool chews up an image or forwards a file on to press that was not within acceptable specifications, who's fault will that be? The company did not buy a tool, and will not blame it. Your job role is likely to "ensure all files comply with required specifications", and a tool can help you do your job faster, more accurately, or even make your job a bit nicer to perform, but it will not take responsibility to ensure you are doing your entire job well.
Some Tasks Are Easily Automated
I personally wrote a script that massively decreased the amount of time it took to take a customer file and set it into an appropriate format for printing. It sure made setting those kinds of files nicer, and it was sent out to many other people who began to use it in their jobs too. I liked that, and realized I really liked working with tools that made people's job better.
My job did not go away, because that was just one tiny task in a large operation.
Most Whole Jobs (That Still Exist) Aren't So Easily Automated
Oh, you're done setting the files already? That was fast. Here then, I'll show you how to use the proof printer. Once you've got that figured out you can help with color-matching palettes, contact sheets, and running basic setups on some of the machines. Maybe we'll show you how to run a machine, help with finishing, help the design team, refill ink, or heck - here's a broom, maybe you can clean up around here. In most places there's plenty of work to be done, and when you run out and they don't have tasks for you right now - well, there's plenty of questions around here about that!
Always Learn More About What You Really Want To Do
There's a key problem with a lot of advice on this subject - which is that there are people who's job it is to develop custom software applications and automation scripts. They are not the same jobs as pre-press technicians or graphic designers, and they do not get paid the same, and they are generally not employed by the same people in the same businesses, either. A pre-press tech who spends all his time trying to automate things may come to be viewed as someone who isn't doing the job they were hired to do, and that's usually when things don't end well. And the employers aren't really wrong - they want someone to do a specific job that fits the needs of their business, not the needs of someone else's business.
If improving your tools makes the job you do better and faster, great! Understand the work output is still your responsibility, and don't think the entire job was really suppose to be open/resize/save all day. If that's all previous people did all day your employers will likely be thrilled you want to do better, learn more, and provide more value to them - at the same low, low price they hired you for a few weeks ago! Your job can grow with time - learn your new job, get good at it, and keep expanding and learning more.
You Might Find Out a Different Path Is Better For You
Now, my issue in the past was I fell into the earlier category - someone who really wanted to spend his time developing automated solutions, researching process improvements, and developing new methods to do work better and faster. My earlier employer did not offer that job, and I had to have some less than pleasant sit-downs to understand that the job I wanted to do was not what they hired me to do, so I had to put aside my interests and do the job they had available. Click-click-click, stare...click-click-click, stare... It was honest and fair work, and I was bored stiff.
It turned out I loved research, working with technology, programming, and designing new methods for work. So that's what I do now - back to school, different day job in programming, and published my first research paper. That path might not be for you - but realize that every job you have includes a lesson about what you like, what you don't like, what you are good at, and what you aren't.
Focus on doing a great job, take personal responsibility for your work, and play the rest by ear. Do things the way they teach you, test out your own faster/improved methods, and see how things go. Maybe you can automate, but pay attention - there might be a really, really good reason someone else hasn't done that already. It might just be that automation is 95% accurate, but if you process 100 files a day they are going to be livid if you screw up 5+ jobs every single day - but sure did that work quick! In which case you will use automation but still have to hand-check every single file - because sometimes that's what they pay you for.