Gamut, Photoshop Bleeds & Color a Test Book
I received my test book today. My main objective was to evaluate for color & contrast and to better plan for gutter & trim issues.
I use a 24” iMac calibrated by a Pantone Huey.This is a very bright display—even at lowest setting.
The ICC profile provided by Sam Edge: http://www.blurb.com/assets/colormgt_dpreview-v3-1.pdf
Most photos were shot in RAW with a Canon 5d. Apple’s Aperture was used to process the raw files.
Heavy “photoshoping” including some Gamut correction. Uncorrected Gamut inserts use bright green to identify. (In the printed book, “out of gamut” images actually printed very well.)
You can view the photoshop created images at:
The yellow notations are comments made after receiving the printed book.
The final book will be a 13×11. These pages are cropped for the less expensive 8×10; therefore some the composition looks strange .
I had no complaints about Blurb. Blocked shadows are an inherent problem of book printing. My photos looker brighter on screen—checking the histogram & lightening the shadows would have helped. (Viewing the screen through squinted eyes can approximate the final print.) We’ll see when the final is published.
It is not meant to be a demo—just a way to answer a few of my questions. Maybe you’ll find it helpful, too.
Oops. Here is the link to the book:
After comparing the test book with the Photoshop images, I’ve found a way to produce a screen view (for my iMac 24 on lowest brightness setting) that very closely approximates the book result (better than “squinting”) :
44% may not apply to your monitor, so this is NOT a “recipe for your success”.
Allen – I’m just preparing my first Blurb book, and I’m using an iMac 24. All the pictures will be black and white. Do you think I should adjust the pictures for brightness in the way you describe? Did you print some B&W images? Any tips? Cheers, P.
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Softcover, Available in:
-(Check Blurb Book Title to determine book print type)
Hardcover out soon…
SEE THE BLURB BOOK HERE:
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There is only one (rather large) problem.
Blurb uses different printing partners for different areas. There is no guarantee that the colour profile used by each printer will be the same.
If you want colours to be exactly as how you intended then the only way is to have your books printed by a single printer; that isn’t something that Blurb is offering. Blurb is cheap for a reason!
I believe if you calibrate your monitor properly and submit images in sRGB space, Blurb does a pretty good job in printing them out. I just got my book back and the images are bright and vivid, but a shade less saturated than the originals. Afterall, we’re dealing with a 4 color printing process here. For prefessionals, you can join Blurb’s B3 service, which gives you an ICC profile and a dedicated calibrated printer. That’s what I’ll try next.
As for adjusting the image color so that it will fit into the printer color space, most people suggest using the Photoshop level, curve or saturation tools. The problem is the adjustments apply to the entire image even though only a small part of the image is out of gamut. One possible quick workaround is to use the color space conversion tool. Assuming you have an original image in sRGB space. You can convert it to the printer profile color space; select the appropriate rendering intent (e.g. perceptual, relative, absolute) that you think looks the best. After the conversion, convert the color space back to sRGB again. Check to see if there is any areas that are out of gamut using the View -> Gamut Warning selection. If everything checks out, bring the sRGB image into SmartBook.
For a more detail write up on this, check out my blog: