Method Image.JPEG.encode()

Method encode

string encode(object image)
string encode(string|object image, mapping options)

Description

Encodes an image object with JPEG compression. The image may also be a string containing a raw JPEG image. In the The options argument may be a mapping containing zero or more encoding options:

"quality" : int(0..100)	Set quality of result. Default is 75.
"optimize" : bool	Optimize Huffman table. Default is on (1) for images smaller than 50kpixels.
"progressive" : bool	Make a progressive JPEG. Default is off (0).
"grayscale" : bool	Make a grayscale JPEG instead of color (YCbCr).
"smooth" : int(1..100)	Smooth input. Value is strength.
"method" : int	DCT method to use. Any of IFAST, ISLOW, FLOAT, DEFAULT or FASTEST. DEFAULT and FASTEST is from the jpeg library, probably ISLOW and IFAST respectively.
"density_unit" : int(0..2)	The unit used for x_density and y_density. 0 No unit 1 dpi 2 dpcm
"x_density" : int	Density of image.
"y_density" : int
"comment" : string	Comment to be written in the JPEG file. Must not be a wide string.
"baseline" : bool	Force baseline output. Useful for quality<25. Default is off for quality<25.
"quant_tables" : mapping(int:array(array(int)))	Tune quantisation tables manually.
"marker" : mapping(int:string(8bit)|array(string(8bit)))	Application and comment markers; the integer should be one of Marker.COM, Marker.APP0, Marker.APP1, ..., Marker.APP15. The string is up to the application; most notable are Adobe and Photoshop markers.
"transform" : int	Lossless image transformation. Has only effect when supplying a JPEG file as indata. FLIP_H Flip image horizontally FLIP_V Flip image vertically ROT_90 Rotate image 90 degrees clockwise ROT_180 Rotate image 180 degrees clockwise ROT_270 Rotate image 270 degrees clockwise TRANSPOSE Transpose image TRANSVERSE Transverse image

Note

Please read some about JPEG files. A quality setting of 100 does not mean the result is lossless.