Image reading system and image reading device

An image reading system comprising:

• a housing;
• a pre-scanning processor that reads an image, recorded in a read object, with a first pitch which is coarser than a second pitch used in a regular scanning operation in which said image is read as a final reading operation, so that a pre-view image is obtained, said pre-scanning processor being provided in said housing;
• an image display processor that displays said pre-view image, said image display processor being provided in said housing;
• an image quality adjustment information input processor that inputs information for adjusting an image quality of said pre-view image, said image quality adjustment information input processor being provided in said housing;
• an image quality adjusting processor that adjusts an image quality of said pre-view image in accordance with said information, said image quality adjusting processor being provided to said housing;
• and
• an external device provided outside of said housing, said external device being configured to process an image signal corresponding to said image;
• wherein the image quality adjusting processor adjusts an image quality in accordance with information output from the external device when the external device is operably connected to the housing, and wherein the image quality adjusting processor adjusts an image quality in accordance with information output from the image quality adjusting information input processor when the external device is not connected to the housing.