A creased sticky note with a sticky body, an adhesive layer and at least one crease is provided. The sticky body has an adhesion portion and a flexible portion disposed adjacent to the adhesion portion. The adhesive layer is disposed on the adhesion portion. The at least one crease is disposed on the adhesion portion, or is disposed between the adhesion portion and the flexible portion, or is disposed on a stress hinders area of the flexible portion which is near the adhesion portion.

An image processing apparatus includes a first correction amount acquiring unit and a first correction unit. The first correction amount acquiring unit acquires a first luminance correction amount of each block based on the luminance of each pixel in the block obtained by diving a first image among multiple processing target images obtained by imaging a target object with multiple sheets bound together while opening the target object. The first correction unit corrects the luminance of each pixel in the multiple processing target images based on the first luminance correction amount of each block acquired by the first correction amount acquiring unit.