***
title: "ImageTransformStrategy"
generated: true
---------------
## ImageTransformStrategy
An injectable strategy which is used to determine the parameters for transforming an image.
This can be used to implement custom image transformation logic, for example to
limit transform parameters to a known set of presets.
This is set via the `imageTransformStrategy` option in the AssetServerOptions. Multiple
strategies can be defined and will be executed in the order in which they are defined.
If a strategy throws an error, the image transformation will be aborted and the error
will be logged, with an HTTP 400 response sent to the client.
```ts title="Signature"
interface ImageTransformStrategy extends InjectableStrategy {
getImageTransformParameters(
args: GetImageTransformParametersArgs,
): Promise | ImageTransformParameters;
}
```
* Extends: [`InjectableStrategy`](/current/core/reference/typescript-api/common/injectable-strategy#injectablestrategy)
## ImageTransformParameters
Parameters which are used to transform the image.
```ts title="Signature"
interface ImageTransformParameters {
width: number | undefined;
height: number | undefined;
mode: ImageTransformMode | undefined;
quality: number | undefined;
format: ImageTransformFormat | undefined;
fpx: number | undefined;
fpy: number | undefined;
preset: string | undefined;
}
```
### width
\
### height
\
### mode
\ImageTransformMode | undefined`} />
### quality
\
### format
\
### fpx
\
### fpy
\
### preset
\
## GetImageTransformParametersArgs
The arguments passed to the `getImageTransformParameters` method of an ImageTransformStrategy.
```ts title="Signature"
interface GetImageTransformParametersArgs {
req: Request;
availablePresets: ImageTransformPreset[];
input: ImageTransformParameters;
}
```
### req
\
### availablePresets
\ImageTransformPreset[]`} />
### input
\ImageTransformParameters`} />