pkg image/jpeg, const DefaultQuality ideal-int
pkg image/jpeg, func Decode(io.Reader) (image.Image, error)
pkg image/jpeg, func DecodeConfig(io.Reader) (image.Config, error)
pkg image/jpeg, func Encode(io.Writer, image.Image, *Options) error
pkg image/jpeg, method (FormatError) Error() string
pkg image/jpeg, method (UnsupportedError) Error() string
pkg image/jpeg, type FormatError string

pkg image, const YCbCrSubsampleRatio440 = 3
pkg image, const YCbCrSubsampleRatio440 YCbCrSubsampleRatio
pkg image, const YCbCrSubsampleRatio444 = 0
pkg image/draw, const Over = 0
pkg image/draw, const Src = 1
pkg image/jpeg, const DefaultQuality = 75
pkg io, type ByteWriter interface { WriteByte }
pkg io, type ByteWriter interface, WriteByte(uint8) error
pkg io, var ErrNoProgress error
pkg log, const Ldate = 1