The material in these guides is recommended for advanced users – such as creative professionals – who require the highest possible precision in rendering color. For most users, an understanding of the advanced concepts of color management is not necessary to produce a great-looking book with Blurb.
For more information, visit our Color Management Resource Center.
NOTE: This document details image prep for Blurb BookWright. For information about image prep for Adobe® InDesign® or Blurb’s PDF to Book workflow, see How to Prepare Images for InDesign and PDF to Book using Adobe Photoshop.
Once you’ve profiled your monitor and installed the Blurb ICC Profile, you are ready to prepare your images for BookWright.
Preparing files for BookWright consists of three steps:
Step 1: Convert images to sRGB (if necessary).
Step 2: Soft proof to preview how your image will print. Make any desired image edits.
Step 3: Save images as high-resolution files and import into BookWright.
BookWright currently accepts greyscale and RGB images with sRGB being the preferred colour space for RGB images. Do NOT place CMYK images into BookWright. Most JPEG images from digital cameras are already in the sRGB colour space so no need to change anything. All other RGB colour space images are converted to sRGB when imported into BookWright. However, this conversion is not always optimal and can lead to unexpected colour changes. For best results, if conversion is necessary, perform this conversion yourself in Photoshop prior to placing into BookWright.
If your images are in sRGB, you are ready to go. If you use Adobe RGB or some other RGB colour space, then you can use Adobe Photoshop to convert your images to sRGB before importing them into BookWright. Photoshop is a fully colour managed application and can convert your images with a minimal amount of coloor shift. Make sure to always work on a copy of your image to preserve your originals in their original colour space.
Once converted, choose File > Save As… to save a copy of your image that is now in sRGB – see Figure 3 on the right.
Once the image has been converted into sRGB, you can get a preview of how the image will print on paper by using the soft-proof option in Photoshop. Soft proofing allows you to see if you need to make adjustments to your file in order to compensate for the printing process. For example, soft-proofing will show you if the printed image will lose too much contrast. Or the printed image may be less saturated than your intent. With soft-proofing enabled, you can edit your image until you are happy with the preview, knowing that what you see with preview turned on is very close to what you’ll see in your printed book.
A high-quality monitor that has been recently calibrated and correctly profiled can display a preview that is greater than 95% accurate to the final printed book. Once you have made all your adjustments, you can then save the file and import it into BookWright.
When Soft Proof is on, your image title bar will indicate “RGB/8/Blurb ICC Profile.” You can toggle the soft-proof on/off by using View > Proof Colours.
Once you have made all your edits you are ready to save your files and import them into BookWright. We recommend that you save a copy of your Photoshop files that have been converted to sRGB and keep your originals as they are. The sRGB files should be saved as either JPEG or PNG format. Blurb recommends the JPEG format for almost all images unless you have incorporated text or vector artwork into the file. If this is the case, we recommend the PNG format to hold the details of this vector-based detail.
That’s it. You’re ready to create your book in BookWright.
Adobe®, Photoshop®, and InDesign® are registered trademarks of Adobe Systems Incorporated in the United States and/or other countries.