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image_get_intermediate_size

Retrieves the image’s intermediate size (resized) path, width, and height.

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wp_image_resize_identical_dimensions

Filters whether to proceed with making an image sub-size with identical dimensions with the original/source image. Differences of 1px may be due to rounding and are ignored.

image_resize_dimensions

Filters whether to preempt calculating the image resize dimensions.

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wp_constrain_dimensions

Calculates the new dimensions for a down-sampled image.

get_image_tag

Filters the HTML content for the image tag.

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get_image_tag_class

Filters the value of the attachment’s image tag class attribute.

get_image_tag

Gets an img tag for an image attachment, scaling it down if requested.