How to reduce size or compress PDF files?

Hi guys,
Does someone knows if there is a way  to reduce the size of the PDF file with good quality even on Pictures and Scanned documents? I know the option 'export', 'quartz filter' 'reduce size', but the compression is so extrem. Many files can't not been read, the quality is so bad. Is there a additional app, software or extension that let the user play with the compression on pdf files and let it be more personalized like the dopdf V7 available for windows? i am very dissapointed with this. Please help or suggestion. I will appreciate it. Thanks

I have used the excellent PDF Toolkit app for a while, and its preformed well. Occassionaly it makes the document into a negative image...which Im noyt sure why...
Mathishk, im trying your online version out, and am impressed and admire the fact that you have done this.
Well done. 
A TRICK i use often. Once all hires images are on the designed document - and its coming in at 15-20mb, just change the link to the images so they are 'missing' then make a pdf.
i.e 'Hi Res images' to HRes images - old'
The screen resolution of images is still great, but file comes in at fraction of the size.
You 'trick' the document to use screen images only. So my 18mb file comes in as 5.2mb.
Just remember to change the images folder name back, so files relink.
Andy

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