Image reading device, image forming apparatus, and image reading method

An image reading device comprising:

• a light receiving array including multiple light receiving elements arrayed in a main scanning direction, the multiple light receiving elements to perform photoelectrical conversion for corresponding pixels and output analog data, respectively;
• multiple analog-to-digital converters to respectively convert the analog data converted by the multiple light receiving elements to digital data in parallel form;
• circuitry configured to convert the digital data in parallel form converted by the multiple analog-to-digital converters to first image data in serial form in the main scanning direction and output the first image data having a first resolution;
• and
• an image processor to perform an image processing to second image data having a second resolution different from the first resolution,
• wherein the circuitry is further configured to convert the first resolution of the first image data to the second resolution of the second image data and output the second image data to the image processor.