Let me know if you have an questions.
Difficulty:

Step one:
Load your image:

Step two, inside the image window click Image>Mode>RGB
Step three: Add a new layer:


Step four, On the new transparent layer (its highlighted blue):

Grab the paintbrush, whatever color works.
Step five, Within the image window, hold down the Shift key, click in the bottom left corner of your image,
Drag the mouse (while still holding the Shift key) to the oppisate side of the image, while still holding the Shift key press the Ctrl key as well-this makes the line perfectly straight.

Left click once at the ending point to get a line started:
Repeat steps three through five but moving the starting point of the line up further each time.
The black background is for informational purposes only. Yours will not be a black layer
Okay, after creating new transparent layers, and moving the bar up on each layer we have this:
(all layers are visible)this isnt what the end product will look like.
Step six:
go to your original image (the one at the bottom) highlight it (in blue):
Duplicate it as many times as you have lines (i duplicated mine eight times as that is as many white bars as i have:

now before we move the duplicated original image layers we are going to go to each of the line layers and change the opacity on each layer to say 60%:


now that we can see through each of the line layers we need to put those lines on an image-thats why we duplicated the original image.
for each line layer we have we want one of the duplicated original images underneath it:
(drag and drop-again i assume you know how to do this-youd be surprised how many dont)on each line layer, right click, left click on 'merge down':

remember to do this on each line layer-not image layer.
after each white line layer is merged down into its companion image i have nine layers, each with a white line going through it:
(i made the preview window bigger so you can see them better)we are almost done!
In the image window Filters>Animation>Optimze for .gif
Then Filters>Animation>Playback to see your results
Then make sure you save as a .gif
all done!:

howd you do?

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