| "quality" : int(0..100) | Set quality of result. Default is 75.
|
| "optimize" : int(0..1) | Optimize Huffman table. Default is on (1) for
images smaller than 50kpixels.
|
| "progressive" : int(0..1) | Make a progressive JPEG. Default is off (0).
|
| "grayscale" : int(0..1) | 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.
|
| "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" : int(0..1) | 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) | 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
|
|
|
Image.JPEG.decode_header()