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Take both of your images, open them in your graphic program of choice, and resave them as jpg. Note that there should be an options settings somewhere that lets you set the amount of compression for saving in jpg. I use Paint Shop Pro, and it's a slider that goes by percentages as an option in the save window, not sure where you'll find it in Irfanview. For normal usage I keep that set to 5% compression, so the images lose very little quality usually not visible at all, yet have some compression. When I resave your images at that 5% setting, the sizes come down to only 77kb and 84kb for the larger scanned image. Since it'll be an image for an ebook, you can probably adjust the compression up a bit higher, you'll have to experiment with it.
If I set my compression to 25% through Paint Shop Pro, it reduces the file size down to only 42kb, so that pretty much matches what SmartSaver Pro can do as far as file size, it just tends to keep a bit sharper image using SmartSaver Pro. You can probably go lower for that type of image also and compress it even further.
But the important thing is you should never use the image from a direct scan without running it through some graphic program first. That's where you can adjust the file size... both dimensions if you need to change that, as well as file data size so the ebook doesn't balloon up to a unnecessarily huge file size.
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