SCARSE:
Scanner CAlibration ReaSonably Easy

SCARSE is a tool that performs color calibration on scanned images. This is done by analyzing a reference image whose color composition is known. A color mapping is calculated from the data which is generated by the scanner and the desired color composition. This color mapping can then be applied to all images scanned with this scanner. SCARSE has been developed by Andrei Frolov. Please see the SCARSE homepage for more details.
Scarse 0.2-alpha needs TIFF-files as input. To use it with (x)scanimage from SANE, a PPM-input is needed. A patch to scarse 0.2-alpha that adds it can be dowloaded below. The patch is not required for scarse 0.3-alpha. It has the PPM-input already included.
Patches for Scarse 0.2-alpha:

A patch to the src-directory of scarse-0.2-alpha that adds PPM-input to the SCARSE tools. Download 6KB.
A patch to the SANEs v1.0.2 scanimage.c that allows to create 16bit binary PPM files that can be read by SCARSE after applying the patch above. Download 1KB.
A patch to the SANEs v1.0.2 xscanimage.c that allows to create 16bit binary PPM files that can be read by SCARSE after applying the patch above. Download 1KB.
A program that converts 16 bit binary PPM files to ASCII PPM. Download 1KB sources, Download 7KB Linux/i386 executable

The patch to SCARSE allows to read ASCII and binary PPM files. Moreover support for some kind of 16 bit binary PPM is included (netpbm only defines 8 bit binary PPM with maxval 255). If maxval is greater than 255, two bytes per channel are read. Byte ordering is the byte ordering of the local machine. This is what (x)scanimage can create with the above patches.

This is a sample what scarse can do:

Image as scanned
data from scanner

Image after color mapping with SCARSE

SCARSE:Scanner CAlibration ReaSonably Easy

SCARSE:
Scanner CAlibration ReaSonably Easy