A method for generating a High Dynamic Range (HDR) image with low bit width, comprising: determining (S21) a to-be-processed HDR image with high bit width; characterized in that the method further comprises: splitting (S22) the to-be-processed HDR image with high bit width to obtain N frames of split images which comprise a first frame to an Nth frame, wherein said splitting (S22) the to-be-processed HDR image with high bit width comprises: determining (S31) a total split gain, wherein the total split gain is a total gain of the N frames of split images; determining (S32) a number N of split frames based on a preset single frame gain and the total split gain, wherein the preset single frame gain is a preset gain of each of the N frames of split images; determining (S33) the first frame to an (N-1)th frame of split images based on the preset single frame gain and the to-be-processed HDR image with high bit width; and determining (S34) the Nth frame of split image based on at least the total split gain; performing (S23) bit width reduction processing on the N frames of split images respectively, to obtain N frames of low-bit-width images; and synthesizing (S24) the N frames of low-bit-width images to obtain the HDR image with low bit width. determining (S21) a to-be-processed HDR image with high bit width; characterized in that the method further comprises: splitting (S22) the to-be-processed HDR image with high bit width to obtain N frames of split images which comprise a first frame to an Nth frame, wherein said splitting (S22) the to-be-processed HDR image with high bit width comprises: determining (S31) a total split gain, wherein the total split gain is a total gain of the N frames of split images; determining (S32) a number N of split frames based on a preset single frame gain and the total split gain, wherein the preset single frame gain is a preset gain of each of the N frames of split images; determining (S33) the first frame to an (N-1)th frame of split images based on the preset single frame gain and the to-be-processed HDR image with high bit width; and determining (S34) the Nth frame of split image based on at least the total split gain; performing (S23) bit width reduction processing on the N frames of split images respectively, to obtain N frames of low-bit-width images; and synthesizing (S24) the N frames of low-bit-width images to obtain the HDR image with low bit width. splitting (S22) the to-be-processed HDR image with high bit width to obtain N frames of split images which comprise a first frame to an Nth frame, wherein said splitting (S22) the to-be-processed HDR image with high bit width comprises: determining (S31) a total split gain, wherein the total split gain is a total gain of the N frames of split images; determining (S32) a number N of split frames based on a preset single frame gain and the total split gain, wherein the preset single frame gain is a preset gain of each of the N frames of split images; determining (S33) the first frame to an (N-1)th frame of split images based on the preset single frame gain and the to-be-processed HDR image with high bit width; and determining (S34) the Nth frame of split image based on at least the total split gain; performing (S23) bit width reduction processing on the N frames of split images respectively, to obtain N frames of low-bit-width images; and synthesizing (S24) the N frames of low-bit-width images to obtain the HDR image with low bit width. <EOS>