You have your choice of these image enhancements:

affine
affine transform image. The parameter has this format:
    sx, rx, ry, sy, tx, ty

Crop
preferred size and location of the cropped image. The parameter has this format:
    <width>x<height>{+-}<x offset>{+-}<y offset>{%}

For example, 100x200+20+10.

To specify a percentage width or height instead, append %. For example to crop the image by ten percent on all sides of the image, use 10%.

Use cropping to apply image processing options to, or display, a particular area of an image. Omit the x and y offset to generate one or more subimages of a uniform size.


Chop
preferred size and location of the chopped image. See crop for the parameter requirements. Use this transform to remove a section of the image from it's interior. If you remove from the exterior of the image, chop behaves like crop.

Coalesce
merge a sequence of images. Requires an image sequence.

Deconstruct
break down an image sequence into constituent parts. Requires an image sequence.

Deskew
straighten an image. The parameter is the threshold (e.g. 40%).

Flip
create a mirror image by reflecting the image scanlines in the vertical direction.

Flop
create a mirror image by reflecting the image scanlines in the horizontal direction.

Layers
Optimize, merge, or compare image layers. Requires an image sequence.

Rotate right
rotate the image right 90 degrees.

Rotate left
rotate the image right -90 degrees.

Rotate
apply Paeth image rotation to the image. The parameter has this format:
    degrees{<}{>}

Use > to rotate the image only if its width exceeds the height. < rotates the image only if its width is less than the height. For example, if you specify -90> and the image size is 480x640, the image is not rotated by the specified angle. However, if the image is 640x480, it is rotated by -90 degrees.


Shave
shave pixels from the image edges. The parameter has this format:
    <width>x<height>

Shear
shear the image along the X or Y axis by a positive or negative shear angle. The parameter has this format:
    <x degrees>x<y degrees>

Shearing slides one edge of an image along the X or Y axis, creating a parallelogram. An X direction shear slides an edge along the X axis, while a Y direction shear slides an edge along the Y axis. The amount of the shear is controlled by a shear angle. For X direction shears, x degrees is measured relative to the Y axis, and similarly, for Y direction shears y degrees is measured relative to the X axis.


Roll
roll an image vertically or horizontally. The parameter has this format:
    {+-}<x offset>{+-}<y offset>

A negative x offset rolls the image left-to-right. A negative y offset rolls the image top-to-bottom.


Trim
remove edges that are the background color.

Unique Colors
discard all but one of any pixel color.



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