I connected my Canon Lide 100 scanner to my Windows 8.1 PC, and Windows installed the driver automatically. Then I opened the Windows Scan app which showed the device name and options for file type, colour mode and resolution. I kept resolution at 300 dpi because that produced good results on my old PC, selected PDF as file type and used colour mode because I intended to scan a colour document. I clicked on 'Preview' and 'Scan', and the app told me that the scan was saved. However when I opened the file in Foxit Reader I was surprised to see that the document filled the width of the monitor screen at only 53% display, meaning that it was gigantically enlarged from A4. The file size of 18MB confirmed this.
I selected greyscale mode and scanned the document again which produced a 6.4MB file, but it was just as enlarged. Canon's own driver would produce a PDF file of about 500kB for such a document, in colour and at 300 dpi. I cannot install that on my new PC because it is for 32-bit versions of Windows only.
Is there any way to reduce the size of a PDF to a reasonable level?
