Book Design and Imaging

Locked White whites?

I’ve noticed that a pure white background in photographs (RGB values 255-255-255 in PSCS3) will still have a very slight grayish tone when printed in Blurb books. As a result when printed on white pages the picture box in the layout will be visible. I want the people in the pictures who were photographed on silhouette white background to be floating freely on the page, not contained in visible (slightly) boxes.
The slightly visible gray is even visible in preview mode within Booksmart.
I’m aware of the workaround method of extending the white background in Photoshop to the extent of being able to drop the images into the layout as full bleed pictures but then I lose the page numbers and other text.
Does anyone know if this slight gray can be eliminated by a better method?

Posted by
foto_grafika
Aug 14, 2008 8:57am PDT
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foto_grafika
 

I don’t know if you’ve already done this, but have you tried setting the page background color manually to the RGB values?

Just a thought…

Regi 

Posted by
rbgool
Aug 14, 2008 1:50pm PDT
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rbgool
 

Thanks Regi. I checked the RGB values in BookSmart and they are already 255 across the board for the white page background as I suspected. The page is paper white, it’s the 255-255-255 sRGB white in the photograph that doesn’t go completely paper white. This is somewhat of a drag when you do a lot of books with people photographed on silhouette white.

Posted by
foto_grafika
Aug 15, 2008 3:54am PDT
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foto_grafika
 

Hello foto_grafika;

That’s interesting… I took a look at my books on screen and in print, and I can’t discern any noticeable greying in the whites… but… I haven’t gone to the effort of scanning a printed page to test it!

But, it certainly should NOT be visible in Preview mode; that is simply looking at a low-res JPEG file! With respect, are you sure you have 255,255,255 set as your BG?

If so, I would guess that it must have something to do with the conversion from sRGB to CMYK, although I would have thought that pure white (255,255,255) and pure black (0,0,0) would NOT be affected by the conversion!

There is an alternative to your dilemma, which is to layer your subject onto a transparent background in PhotoShop, and save the image as a .PNG file. Drag the image into a container as normal, and the unused background in the container will take on the background colour selected in BookSmart…

Cheers;

Lee

 

Posted by
lkb-28
Aug 15, 2008 5:40am PDT
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lkb-28
 

The only other thing I can think of, is if you change the pictures to a transparent background, then save them as png files.  Depending on how many pictures you have, this could be quite tedious.

Sorry I couldn’t be of assistance.

Regi 

Posted by
rbgool
Aug 15, 2008 5:42am PDT
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rbgool
 

Thanks for your replies Lee and Regi. I tried the transparent PNG thing for my logo when using the custom logo option in BookSmart. Originally I had used a jpg image of my logo on a white background but it printed with a visible (albeit very slightly) grayish box around it on the white page. Switching to PNG with transparency for my logo in subsequent books solved the problem. However I didn’t feel the PNG quality was good enough for continuous tone images.

And yes Lee, I am sure the background is 255,255,255. I always make doubly sure of that by selecting the background area in the pictures in Photoshop and forcing it to white. Both the highlight clipping indicators in Curves/Levels and the info palette confirm the 255.255,255 white.

The slight tone, and it is veeery slight indeed, is actually visible in both edit and preview modes in BookSmart and on the printed page with the kind of images I described above, i.e. where the white background of the image meets the page. If I extend the background in Photoshop and drop the image into the layout as a full bleed image it isn’t noticeable any more.

With most other kinds of subject matter, like say landscape, this is not a problem since there’s no white background.

Posted by
foto_grafika
Aug 15, 2008 9:24am PDT
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foto_grafika
 

I’m having the same issue. The pure white 255/255/255 prints as a very light gray. This problem only appeared on my latest printing (May 2010) but did NOT appear with the same file printed last year. Could the new settings at the printer be introducing a minimum dot even when none is present?

Posted by
mrylander
May 11, 2010 10:54am PDT
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mrylander
 

Hi mrylander,

If you haven’t done so already, please contact Customer Support to get help with this.

I’ll be locking this thread as the original post is almost two years old.

-Craig

Posted by
csm
May 11, 2010 12:34pm PDT
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