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Image up-sampling

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Hi
This is my first post here, and I'm facing a small problem with the book I wish to print.

I wrote my first eBook which is about the program 3ds max. At first I started selling it as an eBook, but after some time I decided I would like to print it as a PDF book with Ceatespace.com. However, during the processes of having it printed, I discovered that all the images of the book do not meet the printing requirements, because the images have to be at least 300 dpi. Most of my images are not larger than 150 dpi because I use screen capturing to capture the images from the program. The problem I'm facing now is that I have more than 400 images in the book, which makes the re-capturing and re-editing process of all the images all over again very difficult.
My question is; Can you help me find a way to up-sample the images in a simple and easy way or to find any way to print my book with this low resolution?
Thank you

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