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You may want to try to following workflow instead: 1. From Adobe RGB space, crop to the desired dimension. 2. Do not adjust the picture on screen according to the HP indigo printer soft proof. Instead, convert the image from Adobe RGB space to the HP indigo printer space. The color space conversion engine will do the out of gamut conversion for you. You don’t have to play with the saturation or hue sliders yourself. You will find your histogram now have clipped information on both sides, which is ok since you’re converting from a wide gamut space to a narrower gamut space. 3. After converting to HP indigo color space, if you don’t like what you see, you can play with the adjustments a bit with soft proofing on, making sure you don’t get out of gamut. This step is seldom necessary. 4. When you’re happy with the final look, convert the image to sRGB space. You’ll find the histogram well within the two boundary limits. Soft proofing the image with gamut warning should show no out of gamut areas. The image is now ready for import into the Blurb program. One other thing is where did you get the HP printer profile? How do you know that is the correct profile? Blurb has a B3 program and publishes an ICC profile. The profile is actually a CMYK profile. If you just take any HP printer profile downloaded from the Internet and use it to soft proof the image according to your described workflow, you have just included many outside factors, including the suitability of the profile, the accuracy of your monitor calibration, the accuracy of your own color judgement. I think if you use your original jpeg images and just do the crop and sRGB conversion without doing any soft proofing, you should expect a decent outcome from Blurb without any color cast. I made one book without softproofing and it worked out fine. If color accuracy is paramount, you should join the B3 program, Blurb will provide you with a printer profile and you will send them the book using the color profile workflow option, which costs a bit more.
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