10 classes are annotated with ImageEffect in Drupal 9

AjaxTestImageEffect in core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/AjaxTestImageEffect.php

Provides a test effect using Ajax in the configuration form.

ConvertImageEffect in core/modules/image/src/Plugin/ImageEffect/ConvertImageEffect.php

Converts an image resource.

CropImageEffect in core/modules/image/src/Plugin/ImageEffect/CropImageEffect.php

Crops an image resource.

DesaturateImageEffect in core/modules/image/src/Plugin/ImageEffect/DesaturateImageEffect.php

Desaturates (grayscale) an image resource.

NullTestImageEffect in core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/NullTestImageEffect.php

Performs no operation on an image resource.

ResizeImageEffect in core/modules/image/src/Plugin/ImageEffect/ResizeImageEffect.php

Resizes an image resource.

RotateImageEffect in core/modules/image/src/Plugin/ImageEffect/RotateImageEffect.php

Rotates an image resource.

ScaleAndCropImageEffect in core/modules/image/src/Plugin/ImageEffect/ScaleAndCropImageEffect.php

Scales and crops an image resource.

ScaleImageEffect in core/modules/image/src/Plugin/ImageEffect/ScaleImageEffect.php

Scales an image resource.

UriDependentTestImageEffect in core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/UriDependentTestImageEffect.php

Performs an image operation that depends on the URI of the original image.