open the PDF in Acrobat Pro and use the PDF Optimizer feature and press the "Audit spage usage…" button.
You'll get an overview how much space in the file is used for what.
"Images" compared with "Document Overhead" perhaps will tell you a story.
If Document Overhead is huge, your image data could contain a huge amount of metadata.
Under "Settings" you could safe an PDF Optimizer set, that could consist of a check of "Discard User Data".
There you will see an option for "Discard document information and metadata".
Do not touch "Images" if not needed.
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Try to export your file to Adobe PDF (Interactive) to do this in Indesign
Press Ctrl+E (File > Export) and choose the save type as Adobe PDF (Interactive). It will help you. Thank you
Please stop to give silly and wrong recommendations.
If someone needs print PDFs he cannot use Export to interactive PDF.
The size depends on what you have done in Photoshop:
- What size does the graphic have?
- Why are you doing the graphic in Photoshop, not in Illustrator?
- Why are you not doing the graphic alone in Photoshop or Illustrator and place it in InDesign an do the rest here. This is the most recommended workflow!
If he/she is placing and images in Indesign and creating a pdf and asking about the pdf size then what is the silly suggestion do I have given.
If he/she is working in Indesign than exporting to Adobe PDF (Interative) is the best way to get the reduce pdf size. This is what I am doing for a many years and working fine. (You can check our digital site which i have reduce pdf size to below 5.00 mb, i.e, www.jaypeedigital.com)