# vImageLookupTable_Planar16(_:_:_:_:) Uses a lookup table to transform a 16-bit planar image. ``` func vImageLookupTable_Planar16(_ src: UnsafePointer, _ dest: UnsafePointer, _ table: UnsafePointer, _ flags: vImage_Flags) -> vImage_Error ``` ## Parameters `src` The source vImage buffer. `dest` A pointer to the destination vImage buffer structure. You’re responsible for filling out the `height`, `width`, and `rowBytes` fields of this structure, and for allocating a data buffer of the appropriate size. On return, the data buffer this structure points to contains the destination image data. When you no longer need the data buffer, deallocate the memory to prevent memory leaks. `table` A lookup table that contains 65,536 [`Pixel_16U`](/documentation/Accelerate/Pixel_16U) values. `flags` The options to use when performing the operation. If your code implements its own tiling or its own multithreading, pass [`kvImageDoNotTile`](/documentation/Accelerate/kvImageDoNotTile); otherwise, pass [`kvImageNoFlags`](/documentation/Accelerate/kvImageNoFlags). ## Return Value [`kvImageNoError`](/documentation/Accelerate/kvImageNoError); otherwise, one of the error codes in . ## Discussion For each pixel, this function uses the value from the source image as an index to the 16-bit value from the table. The per-pixel conversion calculation is equivalent to the following: ```objc Pixel_16U table[0x10000]; Pixel_16U result_pixel = table[ input_16_bit_pixel ]; ``` You can use this function with multichannel data by scaling the width of the image to compensate for the additional channels. In this case, all channels use the same lookup table. This function works in place. --- 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)