this module allows you to crop and rotate an image. it also features a perspective correction button, which will let you pick a quad on the image and make these lines parallel after application.
auto crop removes rotation or perspective rims.
aspect is width/height: positive fixes it, 0 maximises area, and -1 uses the
original image aspect. it leaves up to a two-pixel resampling margin.
perspect the quad used for perspective correctioncrop the axis aligned quad used for cropping as (x, X, y, Y) as fractions of (wd,ht), i.e. (0,1,0,1) is the uncropped picture. (1,3,3,7) will result in a micro-cropped version that introduces resampling safety margin.rotate the rotation angle in degrees. if it is set to the special value
1337, it will pick the rotation angle from the orientation exif metadata if
it is passed along with the input image buffer. this is also the default.