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Quicksilver Forums 1.4.2 (Default branch)
08-13-2008
Quicksilver Forums is a fast, feature rich bulletin board system. It is fully object oriented and optimized for speed, ease of use, and easy modification. It checks all inputs though a common interface, which drastically reduces the chances of exploitable bugs. A powerful and flexible skinning engine makes giving your board a new look very simple. An advanced permissions system allows for fine-grained group and user permissions. It is based on the popular MercuryBoard software. License: GNU General Public License (GPL) Changes:|
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MPSImageLaplacian(3) MetalPerformanceShaders.framework MPSImageLaplacian(3) NAME
MPSImageLaplacian SYNOPSIS
#import <MPSImageConvolution.h> Inherits MPSUnaryImageKernel. Properties float bias Additional Inherited Members Detailed Description The MPSImageLaplacian is an optimized variant of the MPSImageConvolution filter provided primarily for ease of use. This filter uses an optimized convolution filter with a 3 x 3 kernel with the following weights: [ 0 1 0 1 -4 1 0 1 0 ] The optimized convolution filter used by MPSImageLaplacian can also be used by creating a MPSImageConvolution object with kernelWidth = 3, kernelHeight = 3 and weights as specified above. Property Documentation - bias [read], [write], [nonatomic], [assign] The bias is a value to be added to convolved pixel before it is converted back to the storage format. It can be used to convert negative values into a representable range for a unsigned MTLPixelFormat. For example, many edge detection filters produce results in the range [-k,k]. By scaling the filter weights by 0.5/k and adding 0.5, the results will be in range [0,1] suitable for use with unorm formats. It can be used in combination with renormalization of the filter weights to do video ranging as part of the convolution effect. It can also just be used to increase the brightness of the image. Default value is 0.0f. Author Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code. Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSImageLaplacian(3)