Abstract: An image decoloring apparatus includes a reader configured to read an image on a sheet to acquire image data, a storage section configured to store the image data acquired by the reader, and a first heater configured to heat the sheet. The apparatus further includes a difference extractor configured to extract difference image data based on first image data read from the sheet before it is heated by the first heater and second image data read from the sheet after it is heated by the first heater. The apparatus additionally includes a setting section configured to set a password required to access the difference image data.

Abstract: An image decoloring apparatus includes a reader configured to read an image on a sheet to acquire image data, a storage section configured to store the image data acquired by the reader, and a first heater configured to heat the sheet. The apparatus further includes a difference extractor configured to extract difference image data based on first image data read from the sheet before it is heated by the first heater and second image data read from the sheet after it is heated by the first heater. The apparatus additionally includes a setting section configured to set a password required to access the difference image data.

Abstract: According to one embodiment, an image forming apparatus includes a speed information obtaining unit, a speed measuring unit, and a determining unit. The speed information obtaining unit obtains a printing speed of a rated value of the image forming apparatus. The speed measuring unit determines a measured speed which denotes a printing speed when a sheet is printed by the image forming apparatus. The determining unit determines that the image forming apparatus is subjected to a modification when the printing speed and the measured speed satisfy a predetermined condition.

Abstract: An image decoloring apparatus includes a reader configured to read an image on a sheet to acquire image data, a storage section configured to store the image data acquired by the reader, and a first heater configured to heat the sheet. The apparatus further includes a difference extractor configured to extract difference image data based on first image data read from the sheet before it is heated by the first heater and second image data read from the sheet after it is heated by the first heater. The apparatus additionally includes a setting section configured to set a password required to access the difference image data.

Abstract: An image decoloring apparatus includes a reader configured to read an image on a sheet to acquire image data, a storage section configured to store the image data acquired by the reader, and a first heater configured to heat the sheet. The apparatus further includes a difference extractor configured to extract difference image data based on first image data read from the sheet before it is heated by the first heater and second image data read from the sheet after it is heated by the first heater. The apparatus additionally includes a setting section configured to set a password required to access the difference image data.

Abstract: According to the embodiments, there is provided an erasing apparatus and an image-forming apparatus. The erasing apparatus prints a mark including printing information of a sheet before erasing processing on the sheet after erasing processing. The image-forming apparatus performs control such that an image to be printed is suppressed to be formed on an area on which a large number of images have been printed in the sheet before the erasing processing.

Abstract: According to the embodiments, there is provided an erasing apparatus and an image-forming apparatus. The erasing apparatus prints a mark including printing information of a sheet before erasing processing on the sheet after erasing processing. The image-forming apparatus performs control such that an image to be printed is suppressed to be formed on an area on which a large number of images have been printed in the sheet before the erasing processing.