I have a file in InDesign with two layers, each with a different version of the same graphic. The graphics in each layer are png files and they are basically exactly the same image except that one has lettering in English and the other has lettering in Spanish. The file size of each png is almost exactly the same (a few kb of difference between them). I want to create a PDF for each language, however one of the exported PDFs is twice the file size of the other and I cannot for the life of me understand why! The only difference between the two PDFs is the png image, but the original pngs have basically the same file size. So I cannot figure out why there is such a big difference in output file size between the two PDFs, generated from the same InDesign file! I export each PDF with exactly the same settings. I have tried clearing the cache, restarting, but it is same problem every time I export the two pdfs. Can anyone shed any light on what might be causing this? Thanks!
- Check if you have any leftover artwork outside the pages on any of the layers.
- Try exporting the EN and ES with the PNGs removed, obvioulsy without saving the INDD file. If you still get the file size difference, the problem is not in the PNGs.
- Otherwise, there must be something different in the PNGs. Check transparency, pixel size, etc.
PDF is not just a file format, it is a container. It can contain raster images, vector shapes, text, and fonts (among other things).
If your PDF weights double it is either because of different compression parameters (which sounds it is not the case) or simply has more information.
So you need to check the PDF to see what additional information it has.
Open it in Illustrator and remove the elements to see what elements are there.
I would suspect that the second raster image is below the first one.