Imagehiisacompressiontoolforonlineimages,supportingGIFcompression,PNGcompression,andJPGcompression.Itcanalsoaddwatermarkstoonlineimageswithotherfunctionslikerotatingimages,stitchinglongimages,changingimagecolors,addingtextstoimages,removingthebackgroundcolorsofimages,changingthebackgroundcolorsofIDphoto,conversingtheimageformat,addingimageborder,producingtheIDphotosofoneinchortwoinches,etc.