PDF File Size Too Large After Adding Images — Any Compression Tips?

The one thing that often comes up is that people do not resize their images to the size they need. Yes, changing resolution is good, but the total number of pixels in width and height also makes a difference.

Consider: if you have an image that is 4000 pixels wide by 3000 pixels tall (12,000,000 megapixels) and you take that image and place it in a section on a page that is 4" x 3", it's still 12,000,000 megapixels because you did not resize the image, you only crammed it into a smaller space. 

Now, take that image and resize it to 4" (x 150= 600 pixels) x 3" (x 150=350 pixels) or 600 x 350 =210,000 pixels. That's 0.0175 of the size of the original.

Another way to think about this is if you halve the size of the image, you decrease its storage size by 3/4.

If you have Photoshop and need me to explain how to resize an image, I'll be glad to show you.

Oh, and yes; vector graphics can be considerably smaller than jpg images. As far as jpg versus png, think of it this way: jpg images of people and trees will be of much better quality than jpg images of text and objects. But, a png image of text and objects will be much better looking and smaller than if they were jpg images. In other words, use the image format best suited to the type of image. It may sound complicated, but it's really not once you understand the basics.