#Adobe indesign classroom in a book pdf pdf#
#Adobe indesign classroom in a book pdf zip file#
#Adobe indesign classroom in a book pdf full#
#Adobe indesign classroom in a book pdf software#

#Adobe indesign classroom in a book pdf pdf#

If I was still printing my own work on a professional wide format printer I would leave the original archived file as a 16 Bit Tiff Pro Photo RGB, however, I am sending a 50 image PDF to outside printers. I fully understand that recompressing a jpeg is not optimal, although a 12 compression jpeg made directly from a 16 Bit Tiff is very difficult to tell apart if recompressed only one more time using 12 compression for less critical repro. My image files start off as RAW files are saved as 16 Bit Tiffs in Pro Photo RGB archived as master files in my library, saved to whatever format the client requests. I avoid jpegs like the plague, other than when forced to use them.

#Adobe indesign classroom in a book pdf full#

I have been scanning images and digital camera files since thge late 90s in my capacity as a full timne professional sports photographer - dug very deep on the technical aspects of digital photography and colour management.

InDesign jpeg Bicubic Maximum, using the same 50 images that were saved directly from Photoshop 16 bit Tiff (not recompressed jpegs) results a total of 85 meg PDF Photoshop - same 50 jpeg 12 compression images images 'recompressed' in Photoshop aklso using 12 compression files total 217 meg.ģ.

Photoshop - 50 images saved directly from 16 bit Tiff files totals 475.7 megĢ. For example I jave just performed the following tests:ġ.

#Adobe indesign classroom in a book pdf software#

I understand digital but I am new to the world of PDF software and don't understand why InDesigns algorithms throw away such much data compared to resaving the same files in Photoshop. It's kind of you to reply in such a comprehensive manner. It helps you find the 'sweet spot.' And hopefully get the PDF file size down to something your print shop can use. Knowing these three factors can help you have the ideal resolution in the final PDF and reduce the need to compress the photos again. Third, what are the compression settings in your PDF export options? The default setting is 'Bicubic downsampling to 300 ppi for images above 450 ppi.' If your print shop only wants 300, this setting needlessly bloats your file, and with 50 photos in your project, that will add a significant amount of data to the PDF. Note that as a photo is enlarged in the layout, the effective resolution is reduced, and as you scale down a photo it's effective resolution increases. Second, what is the effective resolution (number of pixels) of the photos in the InDesign layout file? That's the most critical number in the workflow. But you want to minimize how many other times you'll JPEG the same data to prevent it from being over-corrupted in the end.įirst, to better help you, what type of PDF are you trying to make from InDesign: a press-quality PDF? PDF/X? Print PDF?Īnd what final resolution do you want the photos to have in that final PDF you submit to a printer - 300? 400? 600? Your print shop determines the ideal resolution needed for the type of print technology, paper, quality, etc.

In today's world, it's tough to avoid working with JPEGs at the start of the project: your stock photos and camera shots are usually JPEGs.

Selecting the option to not compress the images embeds the original file format and its full resolution into the PDF. If the InDesign layout is exported using the preset PDF settings, the photos will be embeded as JPEGs in the PDF - and compressed again.If the original photos were JPEGs that were opened in Photoshop, they've already been compressed once, before the layout is created in InDesign and export to PDF.

#Adobe indesign classroom in a book pdf zip file#

The ZIP file format is also a compression format, but it's considered loss-less, that is the data is not corrupted.For a photo, this data loss causes fuzziness/blurriness, wierd colors, color shift, loss of detail and clairty, and halo artifacts where hi-contrast pixels meet. That means each time a file is saved as a JPEG/JPG file, it gets compressed again and data is lost. The JPEG file format is a lossy compression format.Some clarifications (for everyone who finds this discussion now and in the future):

It appears that the photos are being compressed 2 or more times in your workflow and that's not ideal for quality graphics.Īnd it sounds like you're also concerned about the final size of the file submitted to your print shop, correct? Hi Walker, I'm trying to follow your workflow and sort out where the solution lies.