![]() Seek help from an Information Technology Team when needed. If you get a color change after creating an optimized PDF, go back into the PDF Optimizer under Images and make sure Color Image Downsampling is set to Bicubic, at 150 pixels/inch for images above 225 pixels/inch. In that case, you may need to print a non-optimized PDF, or print to the non-postscript driver, or print directly from the program that you used to originally create the file. There are rare occasions when optimized PDFs don’t print correctly. Always use the Postscript version of the printer when sending files from Acrobat, Photoshop, Illustrator or InDesign. Reduce the resolution of the photos to 150 or 200 dpi before creating your PDF. Plus it can cause your file to take a very long time to process inside the plotter, and possibly fail to print. Using too many high resolution photos in Photoshop or Illustrator can cause problems when you save as a PDF and try to optimize. Flatten layers in Photoshop, Illustrator or InDesign before saving as a PDF. Add the word "opt" to your file name so you know it's been optimized (example: elevation-opt.pdf). Don't save over your original filename, in case you need to go back and adjust settings. Choose a location to save your optimized file. Make sure everything is checked (see Figure 4 below) Use Ghostscript ( gs ) to compress input.pdf into output.pdf Low compression: 300 dpi (large file size) BEST in my testing Medium compression (recommended). Make sure everything is checked (see Figure 3 below) ![]() Make sure everything is checked (see Figure 2 below) Change the two Quality settings to "High". Change "Make compatible with" to "Acrobat 7.0 and later" (see Figure 1 below ) This controls the file size and provides a way to reduce printing errors such as rotated and cut-off prints. If you want to print from Photoshop, Illustrator, or InDesign, DON'T DO IT! Instead, save the file as a PDF, open it in Acrobat Pro, optimize it, and print from Acrobat Pro. With Adobe Reader, all you can do is view a PDF. Need to print a large PDF file? Optimize it to shrink the file size, which will get your print through the queue faster and with fewer problems. Unfortunately, you cannot shrink the PDF file size with Adobe Reader because it does not support this process.
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