A white point adjusting apparatus is provided to adjust an achromatic color level for an input video signal including a plurality of color signals, and display an adjusted image on a liquid crystal module. This adjusting apparatus comprises: a first table for setting a white point by deciding an offset quantity of at least one color signal from a highest gray level for each color temperature; a second table for setting an offset quantity of the color signal to converge a halftone white point for each color temperature set by the first table; and a white point adjusting unit for adding the offset quantities set by the first and second tables and to the input video signal.

A white balance adjusting apparatus includes a test signal source 13 for generating a black signal for testing and a white signal for testing, a first impedance means 1 for converting currents flowing through three drive transistors for amplifying primary color R, G, B signals into voltages, a second impedance means 5 connected in parallel with the first impedance means, a switch 6 which is selectively closed to flow a current through the second impedance means, a reference voltage source 7 for generating a first reference voltage at the time of performing the cut-off adjustment and a second reference voltage at the time of performing the drive adjustment, a comparator 8 for comparing the levels between the reference voltages of the reference voltage sources and the output voltage converted by the first or second impedance means, and a microcomputer 75 which generates a control signal for adjusting the white balance on the basis of the output signal of the comparator and adjusts the DC level and the AC level of each of the primary colors of R, G, B.

A magnetoresistive head assembly comprising: a paired magnetoresistive head including first and second magnetoresistive elements, and having a first electrically insulating spacer located between the elements; the first and second magnetoresistive elements being of nominally identical thickness, geometry, magnetic and electrical properties, with the exception that easy-axis of uniaxial anisotropy (excluding shape anisotropy) of the first MR element, is oriented at a first, substantially nonzero angle with respect to the geometrically defined longitudinal axis of the MR elements, and is substantially nonparallel to the easy-axis of uniaxial anisotropy (excluding shape anisotropy) of the second MR element, the easy-axis of uniaxial anisotropy of the second MR element being oriented at a second, substantially nonzero angle with respect to the geometrically defined longitudinal axis of the MR elements; means for making electrical contact to, and supplying a parallel bias current of nominally equal amplitude through both of the MR elements; and means for sensing the difference in voltage across the first and second MR elements.

A rapid white balance method for color digital image is disclosed. This method is applied to RGB color regions in an image. First, the image is divided into several blocks to obtain the G parameter, then the averaged R and B parameters of each block, thereby obtaining the R and B parameters of the whole image. Using the R and B parameters, the method obtains an R gain and a B gain. Finally, the image is adjusted. The method only uses one RGB value for each pixel. The processing time is reduced, while the quality of the image is increased.