Which Approach?---Scan into JPEGs and then save as PDF or scan into PDF?

I am now learning to use my Canon Pixma MX870. I installed the full suite of Canon printing, scanning, faxing and whatever else software they provide for this all-in-one.
There are several different ways you can approach things with this machine which makes it a little confusing. You can do things with a one touch kind of method or you can delve deeper into the menus and adjust lots of settings.
Right now I am working on scanning documents into PDFs. The Canon software lets me create multipage PDFs which is something I've been wanting to do. My question is, is it best to scan images as JPEGs and then save them as a multipage PDF or is it best to scan into PDF directly (which the scanner seems to offer as well) and then save as a multipage PDF? I'm thinking in terms of the best optimization of file size vs. image quality and things like that.
Is the scanner actually doing anything differently when scanning into JPEG vs. PDF? Or is the scanning all the same and it's just the saving of the file that is different?
In general what dpi setting is usually sufficient to use to scan a basic text document without taking up too much file space?
Thanks!
Regards,
Steve M.

Steve M. wrote:
I installed the full suite of Canon printing, scanning, faxing and whatever else software they provide for this all-in-one.
Maybe you don't need that. I prefer using Apple's Image Capture for scanning.
Right now I am working on scanning documents into PDFs. The Canon software lets me create multipage PDFs which is something I've been wanting to do. My question is, is it best to scan images as JPEGs and then save them as a multipage PDF or is it best to scan into PDF directly (which the scanner seems to offer as well) and then save as a multipage PDF? I'm thinking in terms of the best optimization of file size vs. image quality and things like that.
Let the software do it for you. That will be fewer steps for you. Image-based PDFs are going to be large. There is no way around that. If they are too large, you can use Preview's Save As feature and play around with the Quartz Filter.
Is the scanner actually doing anything differently when scanning into JPEG vs. PDF? Or is the scanning all the same and it's just the saving of the file that is different?
Scans are scans. The JPEG file format is lossly and will look worse than other types. If you are scanning in photographs, the JPEGs will look good. If you are scanning in crisp text, JPEGS will have lots of artifacts and look bad.
In general what dpi setting is usually sufficient to use to scan a basic text document without taking up too much file space?
I pretty much always keep it at 300 unless I need something special or when the original is really small and I intend to blow it up.

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