Hi, I am looking for an app to scan documents to PDF. I know apps like Tiny Scan, DocScan, Genius Scan, etc can do that, but I'm looking for one which scans in true black/white (monochrome or 1-bit) mode. All the apps I've tried do have a black/white mode, but in all cases this is simply grayscale, but with less grayscale levels. This way the result looks like black and white, but if you zoom in you still see shades of gray. This way the file size of the scan is always much more than of a scan that is really black and white. For me this is a reason not to use these apps because the resulting PDFs take unnecessarily much more storage space. Desktop scanners do have black/white modes, the iPhone scanners that I have tried do not. At this time an iPhone scanner is no alternative for my regular scanner because of the file size, but the desktop scanner is more hassle (taking it out, connecting to the pc, only able to scan while at the house, etc). Who knows of an iPhone scanner that can really scan in black/white (monochrome) mode? Just for illustration, a scanned page with my 5 year old Canon scanner is saved as a PDF of less than 20KB. The same page scanned with an iPhone PDF-Scanner is on average (multiple apps tested) around 200KB. Scan settings were always set at 300DPI, black/white and compression. If you want to scan 20 documents there's a difference of 0.4MB for the desktop scanner and 4MB for a mobile scanner.