How to Make Every Image on a Page Fade In on Scroll - javascript

I'm polishing up one of my websites, and I would like to add in an effect to all the images on my page so they all fade in when the user scrolls down to each respective image.
I've seen several posts concerning this effect, but they all deal with only fading in one particular image.
Is there a way to have ALL the images on a page fade in when the user scrolls down to each one?
I've got quite a few images on this page, but I didn't want to have to go into each one and copy/paste the code to add the effect to each image individually if I can get away with it.
Bonus points for anyone who could also help me figure out how to reverse the effect when the user scrolls up.
This way, if the user scrolls back to the top (or another section of the page) all the images that have already faded in all fade back out once they are completely out of view.
This way, if the user decides to scroll back down, they get the same image fade in effect each time they scroll through the page.
Any help on this issue would be greatly appreciated. Thank you!

You could check on the scroll event if the offset of a image is reached, and them show the image, on the contrary you can make it work for hidding ;)

You're looking for something like Wow.js. It is very easy to implement.
http://mynameismatthieu.com/WOW/

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Here you have a good reference
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Change z-index of div with fade effect on mouse over

I have 4 images stacked on top of each other, see below:
I'm trying to achieve two things:
When the mouse is over an image that is in the background, that
image should come to the foreground with a fading effect. There is
also different text below each image, that text should come to the
foreground. (no fading needed there)
The result should be like this:
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Thanks!
Although it's impossible to control the fade of an element through his z-index
we can always trick what our eyes see.
DEMO GALLERY
To achieve that we can do:
Insert into our gallery a DIV element that will grab the src attribute of the current image and set it as his background image
hide the current image, position the DIV on this image .position()
fade our DIV in/out
reset image visibility
Let me know if you have some issues, I can comment my code to make clearer the steps I used.
Happy coding
Take a look at this plugin. Just explore it, this has got 100s of different effects which you might like to use in your case.
http://jquery.malsup.com/cycle/browser.html

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