Tips and Tricks

Call for Entry and BLURB Image Size Requirement

Hoping to kill two birds with one entry form.  Our second photography show is coming up.  Last year we had certain requirements for submissions to the show and later we went out to the photographers who were selected and asked for another set of the same images to include in our exhibition catalog.  The resulting catalog is here: http://www.blurb.com/bookstore/detail/1174771

This year we would like to use the call for entry images but what is the best size to keep the entries small for emailing in but big enough for a 7X7 blurb book?  Is 300 DPI and 1024 on the largest side adequate?  Looking for any suggestion.

Charlie

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Posted by
Nikon_Boy
Sep 2, 2010 5:37pm PDT
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Nikon_Boy
 

The ideal size photo for a full-bleed 7×7 page is 2063 × 2067 pixels. So going for 1024 on the ongest size would cause the photo to be scaled up to fit the page, scaling from 1024 to 2063 would roughly halve the dpi and would be just below the 150dpi which would would not print that well. The BookSmart warning kicks in when the dpi of the photo on the page is below 150 (not the dpi of the imported photo).

That would give a best quality JPEG file size of (roughly) between 2Mb and 4Mb depending on the nature of the photo (large areas of plain colour can be compressed more than a mass of fine detail).

In my experience you can increase the pixel size of a photo by 30% in BookSmart and still get acceptable results, that would lead to a maximum size of  (roughly) 1600 pixels on the long side and a file size below 2.5Mb which should be fine for e-mailing. 4Mb may be, that’s your judgement though.

…..Tony

 

Posted by
tfrankland
Sep 3, 2010 12:31am PDT
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tfrankland
 

So, Tony (or any others who want to reply) do you think we can set the call for entry to 150 dpi and 1600 on the longest side for the submissions and those dimensions would be adequate for a 7×7 book?  If so, can we ask the submitters to set the save to a quality of 10 on saving from Photoshop?  Well, of course, we can ask them this but will the resulting image be adequate for the catalog? 

 Charlie

Posted by
Nikon_Boy
Sep 3, 2010 11:39am PDT
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Nikon_Boy
 

You can EITHER specify the size in pixels OR in Inches/cm and dpi mixing the two is not helpful. Have a read of this sequence of posts to understand this.

So my recommendation to your contributers would be to supply photos

1) 1600pixels on the long edge

OR

5.5 inches at 300dpi on the long edge.

Saving to a quality of 10 from Photosjop is a good recommendation.

Either of those would resul in a good print.

…..Tony

Posted by
tfrankland
Sep 4, 2010 1:31pm PDT
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tfrankland