imageutil

Documentation

Index

• Variables
• func CompressImage(raw []byte, originalMediaType string) ([]byte, string)
• func HumanFileSize(n int) string
• func IsImageFile(path string) bool
• func ReadImageFile(path string) (data string, mediaType string, err error)

Variables

var SupportedImageExts = map[string]string{
	".png":  "image/png",
	".jpg":  "image/jpeg",
	".jpeg": "image/jpeg",
	".gif":  "image/gif",
	".webp": "image/webp",
}

SupportedImageExts maps file extensions to MIME types.

Functions

func CompressImage

func CompressImage(raw []byte, originalMediaType string) ([]byte, string)

CompressImage attempts to reduce image size by re-encoding as JPEG at progressively lower quality. Returns the (possibly compressed) bytes and the resulting media type. Falls back to original bytes if compression fails.

func HumanFileSize

func HumanFileSize(n int) string

HumanFileSize returns a human-readable size string.

func IsImageFile

func IsImageFile(path string) bool

IsImageFile returns true if path has a supported image extension.

func ReadImageFile

func ReadImageFile(path string) (data string, mediaType string, err error)

ReadImageFile reads an image from disk and returns its base64 data and MIME type. Images larger than imageTargetBytes are compressed before encoding.