I’m looking for help and guidance with creating reduced file size PDFs from CorelDraw (Standard 2020). I am trying to publish an adult coloring book and I am limited to a 20MB file size. I have 55 designs that are all black and white line drawings. The Corel file is made up of importing these JPG designs into it, one per page. The Corel file is 100MB. When I export it to a PDF, the resulting PDF file is roughly 28MB. The file size reducer in Acrobat only can get it down to about 24MB. I don’t want to lose any of the line detail, so I’ve been trying to manipulate the JPG files to make this work. I cannot for the life of me figure out what is the best format for the JPG files to get the desired result. Low DPI and small dimensions? Low DPI and large dimensions? High DPI and large dimensions? High DPI and smaller dimensions? I started with 72 DPI files in Corel. This is the 100MB file. Then I replaced a bunch of the JPG files in Corel with 300 DPI files, and the Corel file went up to about 239MB, but the PDF export gave me roughly the same file sizes as before. Does anyone have any best practices for creating a smaller PDF file size with line art? I appreciate any suggestions.
How are you originally creating the black and white line drawings? Are they starting out as some sort of vector content, that you are then converting to .JPG?
Hello "Eskimo". The original files are exported from an app and are already in JPG format. They start at about 4000x4000 pixels and are about 7MB. So I already have to reduce them down.
There are PDF presets, document distribution downsamples images to 96 dpi. Since you don't tell me how you're going to view or use the PDF exact settings are impossible.
In the objectvtab of the PDF dialog you can set the resolution of the images in the PDF.
If is say downsample over 300 the resolution of higher resolution images will be reduced to 300, if you need lower change the values. For desktop print 200 usually works.
That's assuming the imagescare above 200 dpi to start.
BHarder said:The original files are exported from an app and are already in JPG format.
The reason I asked is that, from the standpoint of file size, .JPG might not be the best format for line art.
For some types of graphics, lossless compression (possible with .PNG) produces better results than the lossy compression of .JPG.
If you are limited to .JPG, then the level of compression can make a big difference when it comes to file size (sometimes involving a compromise in image quality; depends on the image).
it's for web or for print? if it's for web you don't need to use 300 dpi at all. Moreover, you can use JPG and increase file compression, such as 50%, in order to create a smaller file