Blotting paper.
An irregularly shaped area.
An uneven patch of color or discoloration.
A bright or dark spot on old film caused by dirt and loss of the gelatin covering the film, due to age and poor film quality.
A dark spot on the skin; a pustule.
Any of various crop diseases that cause the plant to form spots.
Imperfection; blemish on one’s reputation, stain.
To develop blotches, to become blotchy.
To mark with blotches.
A translucent design impressed on the surface of paper and visible when the paper is held to the light.
A mark indicating the level to which water has risen.
A logo superimposed on a digital image, a television broadcast, etc.
A value stored in a datafile to ensure its integrity, so that if the file's contents are changed then the watermark will no longer match the contents.
To mark paper with a watermark.
To mark a datafile with a digital watermark.