imOverride

Property Manager name: Image and Video Manager: Set Parameter
Behavior version: The latest rule format supports the imOverride behavior v1.0.
Rule format status: Beta, possible breaking changes
Access: Read/Write
Allowed in includes: Not available for latest rule format

This specifies common query parameters that affect how imageManager transforms images, potentially overriding policy, width, format, or density request parameters. This also allows you to assign the value of one of the property's rule tree variables to one of Image and Video Manager's own policy variables.

Option	Type	Description	Requires
`override`	enum	Selects the type of query parameter you want to set.		{"displayType":"enum","options":["POLICY","POLICY_VARIABLE","WIDTH","FORMAT","DPR","EXCLUDE_QUERY"],"tag":"select"}
	`POLICY`	For the name of the Image and Video Manager policy you want to apply.
	`POLICY_VARIABLE`	Specify that you want to set an Image and Video Manager policy variable from a rule tree variable defined in the property.
	`WIDTH`	A predefined width to constrain the image to.
	`FORMAT`	For browser types.
	`DPR`	For pixel density.
	`EXCLUDE_QUERY`	Excludes the specified query parameters from the cache key.
`typesel`	enum	Specifies how to set a query parameter.	`override` is not `POLICY_VARIABLE` AND `override` is not `EXCLUDE_QUERY`	{"displayType":"enum","options":["VALUE","VARIABLE"],"tag":"select"} {"if":{"op":"and","params":[{"attribute":"override","op":"neq","value":"POLICY_VARIABLE"},{"attribute":"override","op":"neq","value":"EXCLUDE_QUERY"}]}}
	`VALUE`	Assign a specific value.
	`VARIABLE`	Assign a Property Manager rule tree `VARIABLE`.
`formatvar`	string (variable name)	This selects the variable with the name of the browser you want to optimize images for. The variable specifies the same type of data as the `format` option below.	`override` is `FORMAT` AND `typesel` is `VARIABLE`	{"displayType":"string","tag":"input","type":"text"} {"if":{"op":"and","params":[{"attribute":"override","op":"eq","value":"FORMAT"},{"attribute":"typesel","op":"eq","value":"VARIABLE"}]}}
`format`	enum	Specifies the type of the browser, or the encodings passed in the `Accept` header, that you want to optimize images for.	`override` is `FORMAT` AND `typesel` is `VALUE`	{"displayType":"enum","options":["CHROME","IE","SAFARI","GENERIC","AVIF_WEBP_JPEG_PNG_GIF","JP2_WEBP_JPEG_PNG_GIF","WEBP_JPEG_PNG_GIF","JPEG_PNG_GIF"],"tag":"select"} {"if":{"op":"and","params":[{"attribute":"override","op":"eq","value":"FORMAT"},{"attribute":"typesel","op":"eq","value":"VALUE"}]}}
	`CHROME`	Google Chrome.
	`IE`	Internet Explorer.
	`SAFARI`	Apple Safari.
	`GENERIC`	Generic.
	`AVIF_WEBP_JPEG_PNG_GIF`	Best of AVIF, WebP, JPEG, PNG, and GIF.
	`JP2_WEBP_JPEG_PNG_GIF`	Best of JP2, WebP, JPEG, PNG, and GIF.
	`WEBP_JPEG_PNG_GIF`	Best of WebP, JPEG, PNG, and GIF.
	`JPEG_PNG_GIF`	Best of JPEG, PNG, GIF.
`dprvar`	string (variable name)	This selects the variable with the desired pixel density. The variable specifies the same type of data as the `dpr` option below.	`override` is `DPR` AND `typesel` is `VARIABLE`	{"displayType":"string","tag":"input","type":"text"} {"if":{"op":"and","params":[{"attribute":"override","op":"eq","value":"DPR"},{"attribute":"typesel","op":"eq","value":"VARIABLE"}]}}
`dpr`	number	Directly specifies the pixel density. The numeric value is a scaling factor of 1, representing normal density.	`override` is `DPR` AND `typesel` is `VALUE`	{"displayType":"number","tag":"input","type":"number"} {"if":{"op":"and","params":[{"attribute":"override","op":"eq","value":"DPR"},{"attribute":"typesel","op":"eq","value":"VALUE"}]}}
`widthvar`	string (variable name)	Selects the variable with the desired width. If the Image and Video Manager policy doesn't define that width, it serves the next largest width.	`override` is `WIDTH` AND `typesel` is `VARIABLE`	{"displayType":"string","tag":"input","type":"text"} {"if":{"op":"and","params":[{"attribute":"override","op":"eq","value":"WIDTH"},{"attribute":"typesel","op":"eq","value":"VARIABLE"}]}}
`width`	number	Sets the image's desired pixel width directly. If the Image Manager policy doesn't define that width, it serves the next largest width.	`override` is `WIDTH` AND `typesel` is `VALUE`	{"displayType":"number","tag":"input","type":"number"} {"if":{"op":"and","params":[{"attribute":"override","op":"eq","value":"WIDTH"},{"attribute":"typesel","op":"eq","value":"VALUE"}]}}
`policyvar`	string (variable name)	This selects the variable with the desired Image and Video Manager policy name to apply to image requests. If there is no policy by that name, Image and Video Manager serves the image unmodified.	`override` is `POLICY` AND `typesel` is `VARIABLE`	{"displayType":"string","tag":"input","type":"text"} {"if":{"op":"and","params":[{"attribute":"override","op":"eq","value":"POLICY"},{"attribute":"typesel","op":"eq","value":"VARIABLE"}]}}
`policy`	string	This selects the desired Image and Video Manager policy name directly. If there is no policy by that name, Image and Video Manager serves the image unmodified.	`override` is `POLICY` AND `typesel` is `VALUE`	{"displayType":"string","tag":"input","type":"text"} {"if":{"op":"and","params":[{"attribute":"override","op":"eq","value":"POLICY"},{"attribute":"typesel","op":"eq","value":"VALUE"}]}}
`policyvarName`	string	This selects the name of one of the variables defined in an Image and Video Manager policy that you want to replace with the property's rule tree variable.	`override` is `POLICY_VARIABLE`	{"displayType":"string","tag":"input","type":"text"} {"if":{"attribute":"override","op":"eq","value":"POLICY_VARIABLE"}}
`policyvarIMvar`	string (variable name)	This selects one of the property's rule tree variables to assign to the `policyvarName` variable within Image and Video Manager.	`override` is `POLICY_VARIABLE`	{"displayType":"string","tag":"input","type":"text"} {"if":{"attribute":"override","op":"eq","value":"POLICY_VARIABLE"}}
`excludeAllQueryParameters`	boolean	Whether to exclude all query parameters from the Image and Video Manager cache key.	`override` is `EXCLUDE_QUERY`	{"displayType":"boolean","tag":"input","type":"checkbox"} {"if":{"attribute":"override","op":"eq","value":"EXCLUDE_QUERY"}}
`excludedQueryParameters`	string array	Specifies individual query parameters to exclude from the Image and Video Manager cache key.	`override` is `EXCLUDE_QUERY` AND `excludeAllQueryParameters` is `false`	{"displayType":"string array","tag":"input","todo":true} {"if":{"op":"and","params":[{"attribute":"override","op":"eq","value":"EXCLUDE_QUERY"},{"attribute":"excludeAllQueryParameters","op":"eq","value":false}]}}