In Photoshop, you can embed a color profile from the "Image" tab, and then "Convert To Profile." You will need to make the decision on which color profile is appropriate for your images, but the most popular profiles are sRGB and AdobeRGB (1998). Some color profiles may cause errors in your product previews, so if your previews are blank or incorrect please switch to AdobeRGB (1998). To keep the colors the same, be sure to convert to a profile that is the same as your working space - have the "Source Space" and "Destination Space" be the same. An color profile is a set of instructions that is embedded or assigned to your image that tells our monitors how to display the colors accurately. Most images that come from a digital camera (and sometimes scanners) already contain an embedded ICC profile. Otherwise, you will want to embed a profile into your images using your photo editing software, prior to sending us your files.