Out of control page size.

[Jaquick]

I'm running a Mac (10.11 at work, 10.12 at home, 2.8 GHz Intel Core i5 in both cases) with various all-in-one printer scanners. My best scans have been made by scanning color jp2 @ 600 dpi, then converting to pdf with a black and white filter. Lately, though I've been scanning at normal size, my pages have been coming out 8-10x larger (50"x80" for a 7 x 11 page). The computers are new, and I believe I have used them successfully in the past. I've tried updates of Apple software and scanner drivers. It seems to be an issue in Image Capture. does anyone have any advice?

[coulonnus]

Does this prevent you from printing a page on an A4 or letter paper with page scaling="fit to printable area" in Acrobat Reader? Many pdf made by libraries are also too large.

[Sallen112]

Maybe try updating or reinstalling the software for the scanner your using?

[coulonnus]

How do you convert to pdf? If you use the last version of Imagemagick I just learnt this trick: magick yourimage -density %[fx:w/8.26] yourimage.pdf

8.26 is for A4 format. Change it to 8.5 for letter. (desired width in inches)

You can do the monochrome conversion at the same time appending -threshold 50% (or another threshold) to this command.

[daphnis]

This is clearly an older thread, but why aren't you scanning natively in 1-bit mode (monochrome)? That's going to give you by far the lowest file size from the get-go.

[coulonnus]

In this context "size" means "paper dimensions". Not file size in kilo or megabytes.

[Jaquick]

I found out what this issue was. For some reason Preview defaults to 72 dpi. If I change the resolution to whatever my original scanning dpi was (generally 400), the pages size returns to the original scanned page size.