So in the screen capture, ive got up 2 pages, and down, another 2 pages. From left to right up is cover 2 and then page 1, then down, page 2 and page 3. The psd files Ive used for all masters are the same, using the same color space, using the same save options. Up, the green displayed for both background images is lighter and looks more like a CMYK green. Down, the green displayed is the RGB correct green. As i checked many times psd files are good and is nothign wrong with them from what I saw. There must be something I do wrong or I didnt notice in InDesign. As I said, space it is set for RGB, blending mode it is RGB and I do not use any other transparency objects on any of the page. So, Ive got only the background images files, and text from indesign, that is all. Still, I might do something wrong and I am not aware of, because I work usualy only for offset printing purposes, not for screen purposes set as RGB.
My monitor behave the same as the example you gave, unevenly from top to bottom, still this is one of the first things I check if I see something wrong with colors, being aware of monitor behaviour.
As you said the difference is not that big, but it still is and bothers me as long as I want to look everything the way I designed. Not important for this topic, still I am explaining to understand why I need everything as good as it can be. The final pdf file will be available for download on a website I design for an artist. She created an art character who has a background story developed. It is a special page on her website, designed only for this character with his story. The site will be seen in some expositional spaces by many people, so, for this purposes, I really need everything to look good, without evident issues.
Thank you.