mpsimagelanczosscale(3) [mojave man page]
MPSImageLanczosScale(3) MetalPerformanceShaders.framework MPSImageLanczosScale(3) NAME
MPSImageLanczosScale SYNOPSIS
#import <MPSImageResampling.h> Inherits MPSImageScale. Instance Methods (nonnull instancetype) - initWithDevice: (nullable instancetype) - initWithCoder:device: Additional Inherited Members Detailed Description Resize an image and / or change its aspect ratio The MPSImageLanczosScale filter can be used to resample an existing image using a different sampling frequency in each dimension. This can be used to enlarge or reduce the size of an image, or change the aspect ratio of an image. The filter uses a Lanczos resampling algorithm which typically produces better quality for photographs, but is slower than linear sampling using the GPU texture units. Lanczos downsampling does not require a low pass filter to be applied before it is used. Because the resampling function has negative lobes, Lanczos can result in ringing near sharp edges, making it less suitable for vector art. Method Documentation - (nullable instancetype) initWithCoder: (NSCoder *__nonnull) aDecoder(nonnull id< MTLDevice >) device NSSecureCoding compatability While the standard NSSecureCoding/NSCoding method -initWithCoder: should work, since the file can't know which device your data is allocated on, we have to guess and may guess incorrectly. To avoid that problem, use initWithCoder:device instead. Parameters: aDecoder The NSCoder subclass with your serialized MPSKernel device The MTLDevice on which to make the MPSKernel Returns: A new MPSKernel object, or nil if failure. Reimplemented from MPSImageScale. - (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device Standard init with default properties per filter type Parameters: device The device that the filter will be used on. May not be NULL. Returns: a pointer to the newly initialized object. This will fail, returning nil if the device is not supported. Devices must be MTLFeatureSet_iOS_GPUFamily2_v1 or later. Reimplemented from MPSImageScale. Author Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code. Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSImageLanczosScale(3)
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MPSImageThresholdToZeroInverse(3) MetalPerformanceShaders.framework MPSImageThresholdToZeroInverse(3) NAME
MPSImageThresholdToZeroInverse SYNOPSIS
#import <MPSImageThreshold.h> Inherits MPSUnaryImageKernel. Instance Methods (nonnull instancetype) - initWithDevice:thresholdValue:linearGrayColorTransform: (nullable instancetype) - initWithCoder:device: (nonnull instancetype) - initWithDevice: Properties float thresholdValue const float * transform Additional Inherited Members Detailed Description The MPSImageThresholdToZeroInverse filter applies a fixed-level threshold to each pixel in the image. The threshold functions convert a single channel image to a binary image. If the input image is not a single channel image, convert the inputimage to a single channel luminance image using the linearGrayColorTransform and then apply the threshold. The ThresholdToZeroINverse function is: destinationPixelValue = sourcePixelValue > thresholdValue ? 0 : sourcePixelValue Method Documentation - (nullable instancetype) initWithCoder: (NSCoder *__nonnull) aDecoder(nonnull id< MTLDevice >) device NSSecureCoding compatability While the standard NSSecureCoding/NSCoding method -initWithCoder: should work, since the file can't know which device your data is allocated on, we have to guess and may guess incorrectly. To avoid that problem, use initWithCoder:device instead. Parameters: aDecoder The NSCoder subclass with your serialized MPSKernel device The MTLDevice on which to make the MPSKernel Returns: A new MPSKernel object, or nil if failure. Reimplemented from MPSUnaryImageKernel. - (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device Standard init with default properties per filter type Parameters: device The device that the filter will be used on. May not be NULL. Returns: a pointer to the newly initialized object. This will fail, returning nil if the device is not supported. Devices must be MTLFeatureSet_iOS_GPUFamily2_v1 or later. Reimplemented from MPSUnaryImageKernel. - (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device(float) thresholdValue(const float *__nullable) transform initialize a MPSImageThresholdToZeroInverse filter Parameters: device The device the filter will run on thresholdValue The threshold value to use transform This matrix is an array of 3 floats. The default if no transform is specifed is BT.601/JPEG: {0.299f, 0.587f, 0.114f}; Property Documentation - thresholdValue [read], [nonatomic], [assign] The threshold value used to init the threshold filter - transform [read], [nonatomic], [assign] The color transform used to init the threshold filter Author Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code. Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSImageThresholdToZeroInverse(3)