Image processing apparatus including a division-conversion unit and a composing unit, image processing method, computer readable medium

An image processing method comprising:

• extracting data representing N pixels (N is an integer of two or greater) from image data, dividing the extracted data representing N pixels into k (2≦k≦N) divided data elements such that at least one pixel is described in each of the k divided data elements, and converting each of the k divided data elements into a single piece of data by using a conversion table, the conversion table being provided in accordance with the number of pixels described in each of the k divided data elements and being used for converting the corresponding k divided data element into the single piece of data by performing conversion processing including at least one of number-of-bits conversion processing for converting the number of bits per pixel and color space conversion processing;
• and
• combining the single pieces of data obtained by converting the k divided data elements so as to generate output data representing one pixel which is reduced from the extracted data representing N pixels with a reduction ratio of 1/N.

A non-transitory computer readable medium storing a program causing a computer to execute a process, the process comprising:

• extracting data representing N pixels (N is an integer of two or greater) from image data, dividing the extracted data representing N pixels into k (2≦k≦N) divided data elements such that at least one pixel is described in each of the k divided data elements, and converting each of the k divided data elements into a single piece of data by using a conversion table, the conversion table being provided in accordance with the number of pixels described in each of the k divided data elements and being used for converting the corresponding k divided data element into the single piece of data by performing conversion processing including at least one of number-of-bits conversion processing for converting the number of bits per pixel and color space conversion processing;
• and
• combining the single pieces of data obtained by converting the k divided data elements so as to generate output data representing one pixel which is reduced from the extracted data representing N pixels with a reduction ratio of 1/N.