pygame.transform.flip - flip vertically and horizontally	flip vertically and horizontally
pygame.transform.scale - resize to new resolution	resize to new resolution
pygame.transform.rotate - rotate an image	rotate an image
pygame.transform.rotozoom - filtered scale and rotation	filtered scale and rotation
pygame.transform.scale2x - specialized image doubler	specialized image doubler
pygame.transform.smoothscale - scale a surface to an arbitrary size smoothly	scale a surface to an arbitrary size smoothly
pygame.transform.get_smoothscale_backend - return smoothscale filter version in use: 'GENERIC', 'MMX', or 'SSE'	return smoothscale filter version in use: 'GENERIC', 'MMX', or 'SSE'
pygame.transform.set_smoothscale_backend - set smoothscale filter version to one of: 'GENERIC', 'MMX', or 'SSE'	set smoothscale filter version to one of: 'GENERIC', 'MMX', or 'SSE'
pygame.transform.chop - gets a copy of an image with an interior area removed	gets a copy of an image with an interior area removed
pygame.transform.laplacian - find edges in a surface	find edges in a surface
pygame.transform.average_surfaces - find the average surface from many surfaces.	find the average surface from many surfaces.
pygame.transform.average_color - finds the average color of a surface	finds the average color of a surface
pygame.transform.threshold - finds which, and how many pixels in a surface are within a threshold of a color.	finds which, and how many pixels in a surface are within a threshold of a color.

A Surface transform is an operation that moves or resizes the pixels. All these functions take a Surface to operate on and return a new Surface with the results.

Some of the transforms are considered destructive. These means every time they are performed they lose pixel data. Common examples of this are resizing and rotating. For this reason, it is better to retransform the original surface than to keep transforming an image multiple times. (For example, suppose you are animating a bouncing spring which expands and contracts. If you applied the size changes incrementally to the previous images, you would lose detail. Instead, always begin with the original image and scale to the desired size.)

flip vertically and horizontally
pygame.transform.flip(Surface, xbool, ybool): return Surface


This can flip a Surface either vertically, horizontally, or both. Flipping a Surface is nondestructive and returns a new Surface with the same dimensions.

 

resize to new resolution
pygame.transform.scale(Surface, (width, height), DestSurface = None): return Surface


Resizes the Surface to a new resolution. This is a fast scale operation that does not sample the results.

An optional destination surface can be used, rather than have it create a new one. This is quicker if you want to repeatedly scale something. However the destination must be the same size as the (width, height) passed in. Also the destination surface must be the same format.

 

rotate an image
pygame.transform.rotate(Surface, angle): return Surface


Unfiltered counterclockwise rotation. The angle argument represents degrees and can be any floating point value. Negative angle amounts will rotate clockwise.

Unless rotating by 90 degree increments, the image will be padded larger to hold the new size. If the image has pixel alphas, the padded area will be transparent. Otherwise pygame will pick a color that matches the Surface colorkey or the topleft pixel value.

 

filtered scale and rotation
pygame.transform.rotozoom(Surface, angle, scale): return Surface


This is a combined scale and rotation transform. The resulting Surface will be a filtered 32-bit Surface. The scale argument is a floating point value that will be multiplied by the current resolution. The angle argument is a floating point value that represents the counterclockwise degrees to rotate. A negative rotation angle will rotate clockwise.

 

specialized image doubler
pygame.transform.scale2x(Surface, DestSurface = None): Surface


This will return a new image that is double the size of the original. It uses the AdvanceMAME Scale2X algorithm which does a 'jaggie-less' scale of bitmap graphics.

This really only has an effect on simple images with solid colors. On photographic and antialiased images it will look like a regular unfiltered scale.

An optional destination surface can be used, rather than have it create a new one. This is quicker if you want to repeatedly scale something. However the destination must be twice th