If the pictures you want to use in a book are dark or taken in poorly lit conditions or with a cellphone camera, we strongly recommend you correct them before ordering.
If you've specially corrected your images and you're confident your correction is accurate, please don't use "auto-correct" options, as it will alter the corrections you've made.
Bear in mind your monitor will always look brighter than a print as it's back-lit. This needs to be taken into consideration when correcting and comparing images.
For some more technical information about colour and print, please see our blog.