# BNNSImageStackDescriptor ``` struct BNNSImageStackDescriptor ``` ## Overview\abstract Image stack descriptor (DEPRECATED, Use BNNSNDArrayDescriptor) \discussion An image stack is a sequence of images with the same width and height. Each image in the sequence is called a channel. For example, a RGB image will be stored as three separate channels. A pixel has only one scalar value, stored using the type described by data_type. Pixel P(c,x,y) at position (x,y) in channel c is stored in data[x + row_stride * y + image_stride * c], with x=0..width-1, y=0..height-1, c=0..channels-1. row_stride ≥ width, image_stride ≥ row_stride * height. Int types are converted to floating point using float Y = DATA_SCALE * (float)X + DATA_BIAS, and back to integer using Int X = convert_and_saturate(Y / DATA_SCALE - DATA_BIAS) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)