1Videobox 2-------- 3 4This plugin crops or enlarges the image. It takes 4 values as input, a 5top, bottom, left and right offset. Positive values will crop that much 6pixels from the respective border of the image, negative values will add 7that much pixels. When pixels are added, you can specify their color. 8Some predefined colors are usable with an enum property. 9 10The plugin is alpha channel aware and will try to negotiate with a format 11that supports alpha channels first. When alpha channel is active two 12other properties, alpha and border_alpha can be used to set the alpha 13values of the inner picture and the border respectively. an alpha value of 140.0 means total transparency, 1.0 is opaque. 15 16The videobox plugin has many uses such as doing a mosaic of pictures, 17letterboxing video, cutting out pieces of video, picture in picture, etc.. 18 19TODO 20 21- add enum to specify common aspect ratios/sizes and add borders/crop 22