On Wed 02 Jan 2019 at 14:44:14 (+0000), Brian wrote: > On Tue 01 Jan 2019 at 22:41:06 -0500, kamaraju kusumanchi wrote: > > > On Tue, Jan 1, 2019 at 1:40 PM <to...@tuxteam.de> wrote: > > > > > > Yep. The one image is encoded as CCITT (aka Group 4, aka fax [1]), which > > > is > > > passable for low res B&W images, but not that much for hi-res or color (or > > > gray scale). It compresses much worse than the other which is JPEG, which > > > is > > > expressly made for hi-res and color (or grayscale) images. > > > > > > OTOH, CCITT is lossless and JPEG lossy ;-) > > > > > ok, thanks. > > > > > > Questions: > > > > 1) Does the large file size have anything to do with the printer > > > > itself? Is there anything I can do (ex:- update the driver/firmware or > > > > something)? > > > > > > That depends on what is encoding the images: does the scanner itself > > > "make" the PDF? Or some software, computer-side? > > > > > > > The scanner itself makes the pdf files. > > I'm intrigued; I hadn't realised that conversion of the scanned image > for some vendors' devices took place on the device itself. How do you > know this happens? It is the frontend to SANE (xsane or scanimage, for > example) which I've always associated with image aquisition conversion.
It really is rather easy. You insert a USB stick into the scanner, press scan, and later observe that a JPEG or PDF file has appeared on the stick, as appropriate. Cheers, David.
