Colored radiation-sensitive composition for color filter, pattern forming method, color filter and method of producing the same, and solid-state image sensor

A colored radiation-sensitive composition for a color filter, comprising (A) a pigment, (B) a photopolymerization initiator, and (C) a polymerizable compound, wherein:

• the total content of (A) the pigment is from 5% by mass to 50% by mass with respect to the total solids content of the colored radiation-sensitive composition;
• (B) the photopolymerization initiator comprises an oxime compound;
• and the colored radiation-sensitive composition satisfies the following conditions:
• when a colored radiation-sensitive composition layer is formed from the colored radiation-sensitive composition such that spectral transmittance at 600 nm becomes 30%, the colored radiation-sensitive composition layer comprises the following characteristics:
• (1) spectral transmittance at 400 nm is 20% or less;
• (2) spectral transmittance at 550 nm is 10% or less;
• (3) spectral transmittance at 700 nm is 70% or more;
• (4) a wavelength resulting in 50% spectral transmittance is in a range of from 650 nm to 680 nm;
• and
• (5) a film thickness of the colored radiation-sensitive composition layer is in a range of from 0.55 μm to 1.8 μm.