IPhoto Book linescreen, resolution, and color space

to maximize the quality of the iPhoto book I plan to preparemy image files, but I need to know some things about the printing process. Does anybody know the following for the production of the Large iPhoto books:
linescreen
print resolution
colorspace
ANY accepted file types (16 bit layered Tiffs, JPG, or other)
and possibly dot gain (?)
Anybody using Pixel Genius' PhotoKit Sharpener to prepare their files? If so which output sharpeneing settings did you use?
Thanks

Joe:
Welcome to the Apple Discussions. I'll try to answer those that I can.
Linescreen - not familiar with that term but read a while ago that 150 lpi printers were used. Don't know if that's related or not. Also there seems to be a difference (for large book at least) between those printed at the West coast site and those from the East coast site. The west coast books were reported better.
Print resolution - large books are printed at 150 dpi. However, you can change the dpi resolution of the pdf file that gets created for uploading and printing as follows:
Method to increase the print resolution for books:
1 - download and run Pref Setter.
2 - open the iPhoto preference file from within Pref Setter.
3 - locate the Keys titled BookTargetMediumImageDPI, BookTargetSmallImageDPI and BookTargetImageDPI.
4 - change their current values to 300.
5 - save and quit Pref Setter.
Colorspace - I've used sRGB but don't know if that's the optimal one. My results have been OK in my mind.
Files accepted - all those you've listed are acceptable. Tiff file shouldn't have alpha layers as iPhoto doesn't play well with them.
Dot gain - don't know what that is.
For sharpening of those I've sharpened I used Photoshop's Unsharp Mask filter.

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