The default output file type.
The ratio of the image size to permit. The default is 1.0.
The directory to use for work files. The default, it's read from environment variables "TMPDIR", "TMP" or "TEMP" or chosen "/tmp".
Available value is...
Keep all work files.
Automatically remove all work files.
The default is On.
Specify the output image width. ex:
Same as with=, but use for image height.
Specify the manificient of the output image. size=x0.5 is same as width=0.5&height=x0.5
Specify the output file type. Available file types is...
Specify the output file position. ex: trim=10,20,320,480