| bytes | Package bytes implements functions for the manipulation of byte slices. |
| encoding/binary | Package binary implements simple translation between numbers and byte sequences and encoding and decoding of varints. |
| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/nfnt/resize | |
| github.com/pkg/errors | Package errors provides simple error handling primitives. |
| image | Package image implements a basic 2-D image library. |
| image/png | Package png implements a PNG image decoder and encoder. |
| io | Package io provides basic interfaces to I/O primitives. |
| io/ioutil | Package ioutil implements some I/O utility functions. |