I will certainly attempt this another day (tomorrow), it is late at night once again,and maybe one day soon I will be able to begin my video, I hope!!
As for the transition, I am not too bothered by that if this solves the issue of the aspect ratio.
Will post again tomorrow with the results, thanks for the help as always 
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No problem. It took a long time to get to this point. I wish I had thought of the Photoshop solution earlier.
Good night
Keep it simple.
All the contortions and gymnastics with Gimp and Photoshop are unnecessary.
One Filter To Rule Them All. Alpha Channel: Adjust.
The simple solution to your dilemma is here.
bonne nuit…
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Ah! This must be the thread (or one of the threads) that I vaguely remember seeing about this problem.
Works well.
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I think this is exactly the workaround that should apply to the bug I reported a while ago and is still not fixed: Clip transition applies to lower layers
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Sadly adding the alpha channel filter at 0%, 50%, 100% or anywhere in between the ‘amount’ setting to both images doesn’t seem to remove the background coming through the transition, but maybe I am doing it wrong.
@ineedhelp
The Alpha Channel: Adjust solution is just an easier method to use instead of my Photoshop suggestion.
It gets rid of the black background problem that occurs during the transition.
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I wish it would work for me - I can’t fathom why it does not… do you have the same setup as I do? Following all the same steps we have done so far with the same settings? Might be something there that is causing me to not be able to do what you can do
Also the black background is no longer a issue - it is the images changing sizes rather than remaining constant like in the video example I gave of what I am trying to imitate.
Did you remove the SP&R filter from the track head? It is no longer needed.
I have the same effect you have, yet it is not what is in the video example of what effect I need achieved, I have made a video example to illustrate better, of the video I am imitating with the correct transition, and then mine:
Also I do have the SP&R filter on, but I still have the pink background coming through… somewhat annoying, but not the biggest issue right now
Even without out it, it doesn’t make a difference for me - have no idea why…
One thing I should have asked in the first place is the original images YOU use.
If you could share them here, we would be on the same level.
The background image and 2 or 3 of your other images should be enough.
Don’t put them here separately, instead make a ZIP of all the images and share the ZIP file here.
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Should have done it earlier to be honest, but better late than never - the background image and several samples, of different sizes:
Thanks you. I hope this will help.
However, I won’t have time to test them now. I’m leaving soon for a Easter family diner.
Meanwhile, maybe someone else will jump into this discussion an come up with the perfect solution 
Have a good time, I will spending the rest of the night messing around and hoping I get lucky - it worked once before, so you never know, it might happen again 
Thank you.
By the way, what is the Video Mode (Size and frame rate) of your Shotcut project ?
Your background image (thumbnail.png) size is 1569x883. Is your project set to these dimensions as well?
To find out you project’s resolution, select Output in the Timeline look in the Properties tab
I am running 1280x720 based on that
@ineedhelp What you are trying to do will not work with the overlap transition.
You need to use a mask from file filter to do it. For this demo I used your samples. Added a crop rectangle filter to make the image heights the same.
Attached is the project for you to look at to see how it’s done.
Music-Sheet.zip (5.6 MB)
Good luck.
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While this has the right idea and is the exact effect I want - it creates another issue related to a post I made earlier, that all of the images were cropped specifically to show the music, which means if any are made smaller i.e. using the mask from file filter, it will ruin the purpose of the score-video, to show the music with score, as it cuts the images off…
for this I am thinking of a solution that I don’t necessarily like but it might be my only option as I am running out of ideas… to redo the entire score and make the images larger so that when they are made to fit, the cut off doesn’t remove the essential parts (the notes) - hope you understand what I mean, as the video is very music notation orientated and most people probably don’t understand what I am trying to do exactly.
But this is progress, so thank you