Abstract: A colored composition for color filter contains a pigment carrier made of a transparent resin, a precursor thereof, or a mixture thereof, an organic pigment, and a pigment-dispersing agent containing a quinoline derivative having a formula as described in the specification or an amine or metal salt. The color filter contains filter segments formed with the color composition.

Abstract: An ?-diketopyrrolopyrrole pigment characterized by giving an X-ray diffraction spectrum in which the ratio of the peak density (I020) for plane index (020) to the peak intensity (I?141) for plane index (?141), I020/I?141 is 0.40 or lower and the ratio of the peak intensity (I?141) for plane index (?141) to the peak intensity (I111) for plane index (111), I?141/I111 is 1.28 or lower. Also provided are: a coloring composition containing this pigment; and a red film formed with this coloring composition. In a color filter formed with ?-diketopyrrolopyrrole pigment, which has that property, the red filter segments have a high contrast ratio and a small absolute value of birefringence. Consequently, a color liquid-crystal display or the like having small viewing-angle dependence and showing excellent display characteristics can be produced.

Abstract: A colored composition for color filter contains a pigment carrier made of a transparent resin, a precursor thereof, or a mixture thereof, an organic pigment, and a pigment-dispersing agent comprising a quinoline derivative represented by the following General formula (1) or (2), or an amine or metal salt thereof, and a color filter comprises filter segments formed with the color composition: where X represent a halogen atom selected from chlorine, bromine and iodine; n and m each independently represent the number of halogen atoms X, and are each an integer of 0 to 4.

Abstract: A colorless or only slightly colored pigment dispersing agent which is feasible as a pigment dispersing agent for pigments having various hues and has the general formula (1), ##STR1## wherein R.sub.1, R.sub.2, X.sub.1, Y.sub.1, Y.sub.2, k and h are as defined in claim 1.