This backend supports the C, Cxi and Cse series, because they only differ in the software shipped from Hewlett-Packard.
To correct image tone, you can use The GIMP or any other image manipulation program, but adjusting gamma tables you can get good results. All suggestions about how to set the gamma tables and what values are best will be appreciated.
You can still download old files from the HP4200 SANE backend - Downloads.
You will need a fairly new Linux kernel with USB and USB scanner support, either the 2.3.x or 2.4.x releases or the 2.2.x release with the USB backport. (Well, I have developed the backend using release 2.3.48 and above).
If you are using Linux 2.4.18 with sane 1.0.8 you will not have to modify your kernel if it's compiled with USB scanner support.
Important: If you are still using an old Linux kernel, you will need to uncomment the definition of the macro SCN_IOCTL in ``linux/drivers/usb/scanner.h'' as follows:
#define SCN_IOCTLinstead of
// #define SCN_IOCTLThis will remain until a unified access method to send and receive vendor-specific USB requests through the USB scanner driver or the USB filesystem is established.
Then read ``linux/Documentation/usb/usbscanner.txt'' and follow the instructions. By default the backend will look at the ``/dev/usbscanner'' device, but you can override this using the ``hp4200.conf'' file at the sane.d config directory.
gzip -dc sane-1.0.3.tar.gz | tar xvf -The directory `sane-1.0.3' will be created and the source files will be extracted.
gzip -dc ../sane-1.0.3-hp4200-0.2-p1.patch.gz | patch -p1
patching file `backend/Makefile.in' patching file `backend/dll.conf' patching file `backend/hp4200.c' patching file `backend/hp4200.conf' patching file `backend/hp4200.desc' patching file `backend/hp4200.h' patching file `backend/lm983x.c' patching file `backend/lm983x.h' patching file `backend/pv8630.c' patching file `backend/pv8630.h' patching file `tools/hp4200offd.c'all was right, and you can now start the ordinary SANE installation.