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Sharpen an image.
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$im->Sharpen(radius => integer)
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Apply a convolution kernel to sharpen an image. Also see UnsharpMask() and Convolve().
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Shear()
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Shear an image.
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$im->Shear(geometry crop $im->Shear(x y crop => => => => => geometry, boolean) double, double, boolean)
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Shear an image along the x or y axis, by the number of degrees specified. If crop is true, the image will be cropped to its original size; otherwise the resulting size will be as large as is necessary to fit all of the pixels. Any newly created area in the resulting image will be filled with the current background color of the image. The geometry parameter can be used as a shortcut for the x and y parameters.
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Signature()
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Generate a signature for an image.
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$im->Signature()
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This method generates a signature for an image which can be used to verify the data integrity of the image after it has been stored on disk or transported elsewhere. This signature is stored in the image file, whenever the format allows it. In older versions of Image::Magick, the signature was an MD5 sum, but in later versions an SHA1-256 signature is generated. METHODS 273
Solarize()
Solarize an image.
$im->Solarize(factor => percentage)
Apply a solarization filter to an image, which negates all pixels above the specified threshold. This produces a similar effect to exposing a photographic film to light during the development process.
Figure A.7 The Spread (a), Swirl (b) and Wave (c) filters.
Spread()
Spread pixels in an image.
$im->Spread(amount => integer)
Randomly displace pixels in an image by (up to) the specified amount.
Stereo()
Create a stereographic image from two images.
$im->Stereo(image => image object)
This method takes two images (the image operated on, and the one specified as the argument), and produces a single stereographic image (stereo anaglyph). The left side is saved as the red channel and the right side as the green channel. You ll need the proper type of stereo glasses to view the image.
Stegano()
Hide one image in another.
$im->Stegano(image => image object, offset => integer)
This method invisibly hides (a grayscale version of) the image specified as the argument in the current image. See Hiding information in an image on page 150 for an example.
Swirl()
Swirl an image about the center.
$im->Swirl(degrees => double)
Swirls an image s pixels about the center by the number of degrees specified. 274
APPE NDIX A
IMAGE::MAGICK INTRODUCTION & REFERENCE
Texture()
Add a texture to an image.
$im->Texture(image => image object)
The image specified will be used as a tile on the background of the current image, instead of the background color.
Threshold()
Apply a threshold filter.
$im->Threshold(threshold => integer)
This method applies a threshold filter to the image, which results in an image with only two colors. Any pixel that falls above the threshold value will be set to the highest intensity value in the image, and the others will be set to the lowest.
Transform()
Scale or crop an image, applying a sharpening filter.
$new_im = $im->Transform(geometry => geometry, crop => geometry, filter => filter)
This method scales and crops the image according to the geometry specification (see page 277). The filter argument indicates an interpolation algorithm, and is one of Point, Box, Triangle, Hermite, Hanning, Hamming, Blackman, Gaussian, Quadratic, Cubic, Catrom, Mitchell, Lanczos, Bessel, or Sinc. If filter is unspecified, Lanczos will be used. Using Transform() instead of Scale() will often yield a better result, especially when scaling to a larger size. Also see Crop(), Scale(),and Resize().
Transparent()
Make a color transparent in an image.
$im->Transparent(color => color)
This method marks all the pixels that have the specified color as fully transparent. Also see MatteFloodfill() and Draw() with the matte primitive.
Trim()
Trim edges from an image.
$im->Trim()
A call to this method will remove any background color pixels at the edges of the image.
METHODS
UnsharpMask()
Sharpen an image.
$im->UnsharpMask(geometry => geometry, amount => double, threshold => double) $im->UnsharpMask(radius sigma amount threshold => => => => double, double, double, double)
Sharpen an image using the unsharp mask algorithm. The geometry parameter is a shortcut for radius and sigma. Also see Sharpen().
Wave()
Apply a sine wave filter to an image.
$im->Wave(amplitude => double, wavelength => double) $im->Wave(geometry => geometry)
Displace the pixels in an image according to the sine specified by amplitude and wavelength. The parameter geometry can be specified as a shortcut for amplitude and wavelength.
Write()
Write an image to disk.
$im->Write(file specification)
Write() takes any arguments that are settable image attributes. See the discussion on page 244 for more information. Write() can also be called with its lowercase name.
Zoom()
This is an alias for Resize()
$im->Zoom(geometry filter blur $im->Zoom(width height filter blur => => => => => => => geometry, filter, double) integer, integer, filter, double)
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