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Hi
You can easily resize image file size to post it directly in forum.
File as JPEG, quality set to 100% compression is 2.9MB (and 1.15MB with quality set to 95%)
At this encoding quality levels, there’s visualy no JPEG artifacts visible for a normal human 
Grum999
Thank you for your kind advise^^ I guess I will change the main file for this post. It surely is a little bit confusing how to post my images on this webpage.
it seems you’ve found how to process 
Grum999