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Hi Catherine, I’m just another author here at Blurb. Did you create the book yourself? There are any number of reasons you can have quality problems, but I think most fall into a few categories that you (or the author) might want to investigate:
1. Conversion between formats. One example would be if you converted an image in a RAW format to a smaller image, then upsized that image to a larger one, using a smaller bit depth. There are so many possibilities between this one.
2. Resolution. You need a high enough resolution to convey all the color information in the image. If you used a 72 dpi resolution, for example, it’s not going to look very good. I assume all images are 300 dpi (though you can refine this if you know exactly what the resolution of the book is—often for printing, it is 240 dpi.
3. Color space. This is where a lot of people get messed up. If you have an image in RGB or CMYK, or some other format, and the publisher needs it in another format, then you will definitely have color problems.
4. Calibration of your monitor. If your colors look okay on your monitor, and you print them and they look awful, most often it is because your monitor is not producing the same color as your print/book.
You should be able to research any of these topics either here or elsewhere on the net. The fact that the book turned out okay on another service, could just be luck that your images were in the correct format for that service, but not for Blurb. ~ Axel
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