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# 7.2.3 Z-Format Images

The image-z subtype represents an image as a two-dimensional array of pixels, in scanline order. The following paragraphs describe the additional CLX functions that can be used to access image-z objects.

image-z-bits-per-pixel | image | Function

| image An image-z object. Returns and (with setf) changes the number of bits per data unit used to contain a pixel value for the image. Depending on the storage format for image data, this value can be larger than the actual image depth. pixel-data-size One of 1, 4, 8, 16, 24, or 32.

image-z-pixarray | image | Function

| image An image-z object. Returns and (with setf) changes the two-dimensional array of pixel data for the image. pixarray Type pixarray .

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