@spec default_image_usage(platform()) :: image_usage()

Returns the default image type that an image is resized to for a given platform is no :type parameter is provided.

Arguments

• platform is any known social platform. See Image.Social.known_platforms/0.

Returns

• The default image type for the platform.

Example

@spec image_usages(platform()) :: [image_usage()]

Returns the image types for the given social platform.

Arguments

• platform is any known social platform. See Image.Social.known_platforms/0.

Returns

• A list of images uses available for the platform.

Example

@spec known_platforms() :: [platform()]

Returns a list of known social platforms.

Example

Return the map of social media image sizes.

The returned map of maps is of a standard form:

• The first key is the platform name (ie :twitter)
• The second key is the image type for the platform (ie :profile)
• The third level is optional. But if it exists it must have three keys: :landscape, :portrait and :square

The values are all of the form "WxH" where W is the width in pixels and H is the height in pixels.

@spec resize(Vix.Vips.Image.t(), platform(), Keyword.t()) ::
  {:ok, Vix.Vips.Image.t()} | {:error, Image.error_message()}

Resize an image for a particular social platform and usage.

This function:

• Resizes an image to the correct dimensions, including being image aspect aware
• Converts to the sRGB color space
• Minimises metadata (retains only Artist and Copyright)

Arguments

• image is any Vix.Vips.Image.t/0

• platform is the name of a known social media platform. See Image.Social.known_platforms/0.

• options is a keyword list of options.

Options

• :type is the image type within the social platform for which the image should be resized. See Image.Social.image_usages/1

• All other options are passed to Image.thumbnail!/3.

Returns

• {:ok, resized_image} or

• {:error, reason}

@spec resize!(Vix.Vips.Image.t(), platform(), Keyword.t()) ::
  Vix.Vips.Image.t() | no_return()

Resize an image for a particular social platform and usage.

This function:

• Resizes an image to the correct dimensions, including being image orientation aware
• Converts to the sRGB color space
• Minimises metadata (retains only Artist and Copyright)

Arguments

• image is any Vix.Vips.Image.t/0

• platform is the name of a known social media platform. See Image.Social.known_platforms/0.

• options is a keyword list of options.

Options

• :type is the image type within the social platform for which the image should be resized. See Image.Social.image_usages/1

• All other options are passed to Image.thumbnail!/3.

Returns

• resized_image or

• Raises an exception.