# vImage.EdgeMode Constants that specify edge modes for convolution operations. ``` enum EdgeMode ``` ## Topics ### Enumeration Cases [`case copyInPlace`](/documentation/Accelerate/vImage/EdgeMode/copyInPlace) An edge mode that copies the value of the edge pixel in the source to the destination. [`case extend`](/documentation/Accelerate/vImage/EdgeMode/extend) An edge mode that extends the edges of the image infinitely. [`case fill(backgroundColor: PixelType)`](/documentation/Accelerate/vImage/EdgeMode/fill(backgroundColor:)) An edge mode that uses the background color for missing pixels. [`case truncateKernel`](/documentation/Accelerate/vImage/EdgeMode/truncateKernel) An edge mode that uses only the part of the kernel that overlaps the image. --- 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)