| errors | Package errors implements functions to manipulate errors. |
| github.com/nfnt/resize | Package resize implements various image resizing methods. |
| golang.org/x/image/draw | Package draw provides image composition functions. |
| image | Package image implements a basic 2-D image library. |
| image/color | Package color implements a basic color library. |
| image/jpeg | Package jpeg implements a JPEG image decoder and encoder. |
| image/png | Package png implements a PNG image decoder and encoder. |
| io/ioutil | Package ioutil implements some I/O utility functions. |
| log | Package log implements a simple logging package. |
| math | Package math provides basic constants and mathematical functions. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| path/filepath | Package filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths. |
| time | Package time provides functionality for measuring and displaying time. |