A method of operation within an integrated-circuit image sensor having a pixel array during an image frame interval, the method comprising: reading out the pixel array of the integrated circuit image array multiple times per frame interval to generate respective subframe readout results that include a non-final "full" readout result that corresponds to the total photocharge accumulated within the pixel array during a first non-final subframe interval, two or more "fractional" readout results each of which corresponds to a fractional portion of photocharge accumulated within the pixel array during a respective one of two or more second non-final subframe interval that occur later than the first non-final subframe interval, and a final full readout result that corresponds to the total photocharge accumulated within the pixel array during a final subframe interval plus the remainder of the photocharge accumulated during the last non-final subframe interval comprising: after a first exposure interval that constitutes a first fraction of a frame interval, full reading out of the pixel array by readout circuitry coupled to respective floating diffusion nodes to produce first readout signals, which represent the photocharge transferred from the photodiode to respective floating diffusion nodes, wherein the first signals are representative of total photocharge integrated within respective pixels and transferred in its entirety to respective floating diffusion nodes during the first exposure interval; after each second exposure interval each of which constitutes a further fraction of the frame interval and transpires after the first exposure interval or a preceding second exposure interval, fractional reading out of the pixel array by readout circuitry coupled to the respective floating diffusion nodes to produce second readout signals, which represent the photocharge integrated within the pixels in excess of a read-threshold level and transferred to respective floating diffusion nodes, the fractionally reading out including removing the photocharge in excess of the threshold level from the pixels and transferring the photocharge in excess of said threshold to the respective floating diffusion nodes and leaving residual photocharge within the pixels transferred from the photodiode to respective floating diffusion nodes; and after a third exposure interval that constitutes a final fraction of the frame interval and transpires after the last second exposure interval, full reading out of the pixel array by readout circuitry coupled to respective floating diffusion nodes to produce third readout signals, the third readout signals representative of a combination of the residual photocharge and photo charge integrated within the pixels and transferred to the respective floating diffusion nodes during the third exposure interval, wherein the floating diffusion nodes are charged to a reset state and the reset state is captured by a sample and hold element before each read out. after a first exposure interval that constitutes a first fraction of a frame interval, full reading out of the pixel array by readout circuitry coupled to respective floating diffusion nodes to produce first readout signals, which represent the photocharge transferred from the photodiode to respective floating diffusion nodes, wherein the first signals are representative of total photocharge integrated within respective pixels and transferred in its entirety to respective floating diffusion nodes during the first exposure interval; after each second exposure interval each of which constitutes a further fraction of the frame interval and transpires after the first exposure interval or a preceding second exposure interval, fractional reading out of the pixel array by readout circuitry coupled to the respective floating diffusion nodes to produce second readout signals, which represent the photocharge integrated within the pixels in excess of a read-threshold level and transferred to respective floating diffusion nodes, the fractionally reading out including removing the photocharge in excess of the threshold level from the pixels and transferring the photocharge in excess of said threshold to the respective floating diffusion nodes and leaving residual photocharge within the pixels transferred from the photodiode to respective floating diffusion nodes; and after a third exposure interval that constitutes a final fraction of the frame interval and transpires after the last second exposure interval, full reading out of the pixel array by readout circuitry coupled to respective floating diffusion nodes to produce third readout signals, the third readout signals representative of a combination of the residual photocharge and photo charge integrated within the pixels and transferred to the respective floating diffusion nodes during the third exposure interval, wherein the floating diffusion nodes are charged to a reset state and the reset state is captured by a sample and hold element before each read out.