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=== Derived Images ===
Derived images enable non-destructive image editing, where the original coded images are kept in the file, while new images, called derived images, can be introduced by specifying a transformation operation that is applied to one or more input images. HEIF specifies the generic structures used for storing derived images as items as well as a few specific types of derived images. The item type of a derived image item indicates the transformation operation, while the item payload contains the input parameters to the operation. The input images can be coded images or derived images. The derived image types specified in the HEIF standard are listed below. Other types may be specified in other documents or later versions of the HEIF standard.
{| class="MsoNormalTable"
! colspan="3" |Derived Image Items
|-
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'''Name'''
|
'''Item 4CC'''
|
'''Description'''
|-
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Identity transformation
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iden
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Cropping and/or rotation by 90,
180, or 270 degrees, imposed through the respective transformative
properties.
|-
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Image overlay
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iovl
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Overlaying any number of input
images in indicated order and locations onto the canvas of the output image.
|-
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Image grid
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grid
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Reconstructing a grid of input
images of the same width and height.
|}
== References ==
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