.TH "MPSImageTent" 3 "Mon Jul 9 2018" "Version MetalPerformanceShaders-119.3" "MetalPerformanceShaders.framework" \" -*- nroff -*-
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.SH NAME
MPSImageTent
.SH SYNOPSIS
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\fC#import <MPSImageConvolution\&.h>\fP
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Inherits \fBMPSImageBox\fP\&.
.SS "Additional Inherited Members"
.SH "Detailed Description"
.PP 
The box filter, while fast, may yield square-ish looking blur effects\&. However, multiple passes of the box filter tend to smooth out with each additional pass\&. For example, two 3-wide box blurs produces the same effective convolution as a 5-wide tent blur: 
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1   1   1
    1   1   1
+       1   1   1
=================
1   2   3   2   1

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 Addition passes tend to approximate a gaussian line shape\&.
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The \fBMPSImageTent\fP convolves an image with a tent filter\&. These form a tent shape with incrementally increasing sides, for example: 
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1   2   3   2   1


1   2   1
2   4   2
1   2   1

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Like the box filter, this arrangement allows for much faster algorithms, espcially for for larger blur radii but with a more pleasing appearance\&.
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The tent blur is a separable filter\&. The implementation is aware of this and will act accordingly to give best performance for multi-dimensional blurs\&. 

.SH "Author"
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Generated automatically by Doxygen for MetalPerformanceShaders\&.framework from the source code\&.