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The gamma of a greyscale image should be between 2.2 and 2.4.
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For greyscale images, use ZIP encoding. Images should remain in their original profile (do not convert from CMYK to sRGB or vice versa). Artificial greyscale (sRGB or CMYK with near-matching channel values) can be printed with cyan or magenta hues within the image. If you are printing a color book with black and white images within it, the black and white images should have the colorspace set to greyscale. To reduce file size, JPEG -> High should be used. Image compression should be set to ZIP if you want lossless (no artifacts/distortion-free) images. 
Now you want to set the image files in the PDF, right? Here's some tips:
Image DPI, in its final document dimensions, should not exceed 600 dpi, and preferably should be about 300 DPI, to optimize RIP speed. If your Grayscale images have a Gamma of 1.8, they will print too dark. The DocuSP is optimized to best print Grayscale images whose "Gamma" is between 2.2 and 2.4. If an image is meant to be Gray, its color space should be gray. Do not use "Artificial" Grayscale, ie… sRGB or CMYK images with near matching channel values. Images that are Multi-Strip can print with lines between the strips. Do not use images that are Multi-Strip. LZW compression may produce Multi-Strip Image files, especially on TIFF images. Do not use images with LZW compression. Do not use images with CCITT compression. 
Do not change the colorspace of an image file, ie… if your original image file is in sRGB, DO NOT CONVERT to CMYK. Spot colors that are below an images transparency might not print. USE CMYK or sRGB Colors in Paths that are below Transparencies. Overprint and Simulate Overprint should be turned off. Keep in mind the larger the file, the longer it will take to upload. #Presto pagemaker pdf
Certain PDF Tools such as Pitstop may have problems.If fully rasterized and the DPI is greater than 300, downsample to 300. Do not downsample your images unless the images are fully rasterized.Aways ZIP Grayscale images, do not use CCITT.Leave the PDF colorspace in its original profile (Do not convert CMYK to sRGB or vice-versa).Set compatibility mode to Acrobat 6 or higher.Further, The RIP might reject the font resource entirely and substitute Courier. But since that font has multiple definitions in the PDF, the font resource that the rip builds can be garbled from being overwritten over and over again. Technical Note: The RIP works to build a single font resource for a multiply subsetted font. Subsetted fonts over multiple pages may cause problems when your PDF is rasterized for print resulting in text printed with symbols instead of fonts, garbled text, or missing text.
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If your book has text, ALWAYS embed the full font family for all fonts within the document.
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Here is a list of PDF Creation Software that can convert documents to press-ready PDFs. We recommend PDF 1.5 for files with heavy layering and transparencies. The printer software (known as a RIP) does not process all transparencies properly which may result in an unsatisfactory print, even if the same PDF prints properly on your home printer or computer screen. A particular problem is images with layers and transparencies will be placed as transparent elements into the PDF. If your PDF file is 1.4 or lower and the fonts or transparencies don't print properly we will NOT reprint the book. *NOTE* PDF 1.3 and 1.4 may work, However, with older formats, files with transparencies and layers may have issues.
When exporting to PDF, your file must be compatible with Acrobat 6 (PDF 1.5) or higher. We recommend all important visual elements are at least 3/4" (21mm) from the edges. Perfect bound books trim 1/8" from every edge, and hardcover books trim up to 1/4" from every edge. Our process automatically trims up to 1/4" from each edge. 
There should be no crop marks in your PDF. Make your PDF +.25" (+7mm) larger than your desired book size. Your cover must be uploaded as a separate file. We support the sRGB and CMYK color space for interior text blocks. View continuous, facing pages in your PDF application to see how the *inside* of your book will print. For all books, page 1 always prints on the right, opposite the blank inside front cover. Create your full wrap cover and interior pages as two separate documents - they are printed as separate documents. Please don’t add passwords or encryption to your PDF file or we won’t be able to print it!
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