An image reading and processing apparatus in which an image-carrying medium is scanned along a predetermined path in a line-by-line manner and, during each cycle of line scanning, image data is produced from a line of pixels on the scanned image-carrying medium and is stored into image data memories for each line of pixels on the image-carrying medium while data-write and data-read address signals are generated by first and second address generators and are supplied independently of each other to the image data memories, the second address generator being operative to supply the data-read address signal to the image data memories at a timing regulated on the basis of a signal indicative of a magnification/reduction ratio at which an image on an image-carrying medium is to be reproduced, wherein there are further provided an attribute data storage memory having a plurality of memory spaces respectively corresponding to a plurality of scanning areas, each memory space storing attribute data designating the conditions in which the image is to be reproduced, the attribute data storage memory being responsive to an attribute data address signal for outputting the attribute data corresponding to the attribute data address signals, wherein the image data output from the image data memory is processed on the basis of the attribute data output from the attribute data storage memory, and either the data-read address or the data-write address signal is supplied to the attribute data storage memory as the attribute data address signal.