White booklet pages are prone to yellowing over time. The yellow can be removed fairly easily.
This tutorial builds off the methods used in
Solid Background Colors On Booklet Pages tutorial. That thread will further explain each of the steps used here.
This is what the image looks like initially
First remove the Yellow tint from the image. Go to Adjustments under the layers tab and add a Curves adjustment.
Select CMYK to get access to Yellow tint. Then change Master to Yellow. To get just a yellow adjustment curve.
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Drag the curve down and the yellow hue in the image will go away
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Here is Before & After of the Curves adjustment
Animated GIF image. Click to view.
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Next use the Magic Wand and select the white part. The rough selection might look something like this.
Go to Select Menu > Grow/Shrink and use a negative value to make the selection pull away from the font. Use the Marquee tool in ADD mode and fill in the selection holes as well as add the few pixels missing around the edge of the image from when the shrink was done.
Next use the Color Picker (Eye Dropper) and adjust the radius to get a good sample area (but not so big you get other colors in the area).
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The color will now show up in your color tab
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With the selection still active, add a new layer and use the paint bucket to fill the layer with the matched white.
Then use the paint brush and fix the spine/crease area by clicking once at the top of the crease and then shift click at the bottom to stroke a line between the two points. See the other tutorial to see this explained in more detail.
Next add a Levels adjustment to even out the white levels.
Animated GIF showing Before & After the final adjustments. Click to view the animated image.
