img4g

func (*Image) Composite ¶

func (this *Image) Composite(compositeImg *Image, x int64, y int64) error

Composite() composite one image onto another at the specified offset.

compositeImg: The composite image x: The column offset of the composited image. y: The row offset of the composited image.

func (*Image) CreateWand ¶

func (this *Image) CreateWand() error

CreateWand() creates a new wand for this Image by using Blob data

func (*Image) Crop ¶

func (this *Image) Crop(width int64, height int64, x int64, y int64) error

Crop() extracts a region of this image.

width: the region width height: the region height x: the region x offset y: the region y offset

func (*Image) DestoryWand ¶

func (this *Image) DestoryWand()

DestroyWand() deallocates memory associated with this Image wand.

func (*Image) DigitalWatermark ¶

func (this *Image) DigitalWatermark(copyright *Image) error

DigitalWatermark() embed copyright image information into this image. The watermark is imperceptible to human senses

copyright: The copyright image

func (*Image) Dissolve ¶

func (this *Image) Dissolve(dissolve int) error

Dissovle() sets transparency of this image to the specified value dissolve

dissolve: 0~100,0 means totally transparent while 100 means opa

func (*Image) GetFormat ¶

func (this *Image) GetFormat() (string, error)

GetFormat() return format of this image

func (*Image) GetHeight ¶

func (this *Image) GetHeight() (int64, error)

Returns the image height

func (*Image) GetWidth ¶

func (this *Image) GetWidth() (int64, error)

Returns the image width

func (*Image) Resize ¶

func (this *Image) Resize(width int64, height int64) error

Resize() resizes the size of this image to the given dimensions.

width: width of the resized image height: height of the resized image

func (*Image) Rotate ¶

func (this *Image) Rotate(degrees float64) error

Rotate() rotates an image the specified number of degrees.

degrees: degrees of the rotated image

func (*Image) Scale ¶

func (this *Image) Scale(columns int64, rows int64) error

Scale() scales the size of this image to the given dimensions.

columns: The number of columns in the scaled image. rows: The number of rows in the scaled image

func (*Image) SetCompressionQuality ¶

func (this *Image) SetCompressionQuality(quality int) error

Sets the image quality factor, which determines compression options when saving the file

quality: The image quality

func (*Image) SetFormat ¶

func (this *Image) SetFormat(format string) error

Sets the file or blob format (e.g. "BMP") to be used when a file or blob is read. Usually this is not necessary because GraphicsMagick is able to auto-detect the format based on the file header (or the file extension), but some formats do not use a unique header or the selection may be ambigious.

Use MagickSetImageFormat() to set the format to be used when a file or blob is to be written.

format: The file or blob format

func (*Image) Size ¶

func (this *Image) Size() (int64, int64, error)

func (*Image) Strip ¶

func (this *Image) Strip() error

Strip() removes all profiles and text attributes from this image.

func (*Image) Write ¶

func (this *Image) Write(p []byte) (int, error)

func (*Image) WriteImageBlob ¶

func (this *Image) WriteImageBlob() error

WriteImageBlob() writes this image wand to Blob