Signal processing apparatus and non-transitory computer readable medium

A signal processing apparatus comprising:

• a first processor and a second processor that read and execute a program;
• and
• a memory, wherein:
• the first processor is configured to process a plurality of color signals at one time and output the plurality of color signals in parallel,
• the memory is configured to temporarily store the plurality of color signals output from the first processor,
• the second processor is configured to sequentially read and process a plurality of color signals processable at one time from the memory, and
• the first processor and the second processor are configured to process the plurality of color signals in units of bands each including a plurality of lines;
• after completion of processing of a first band, processing of a next second band starts;
• and the first processor is configured to start processing the second band at a time point which is before completion of processing of the first band by the second processor, and at which color signals of the first band remain in the memory.