# 预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

`COLOR_*` constants

Colortype constants. These constants are mainly used with ImagickPixel.

`imagick::COLOR_BLACK` (int)
  Black color
`imagick::COLOR_BLUE` (int)
  Blue color
`imagick::COLOR_CYAN` (int)
  Cyan color
`imagick::COLOR_GREEN` (int)
  Green color
`imagick::COLOR_RED` (int)
  Red color
`imagick::COLOR_YELLOW` (int)
  Yellow color
`imagick::COLOR_MAGENTA` (int)
  Magenta color
`imagick::COLOR_OPACITY` (int)
  Color's opacity
`imagick::COLOR_ALPHA` (int)
  Color's alpha
`imagick::COLOR_FUZZ` (int)
  Color's fuzz

`DISPOSE_*` constants

Dispose type constants

`imagick::DISPOSE_UNRECOGNIZED` (int)
  Unrecognized dispose type
`imagick::DISPOSE_UNDEFINED` (int)
  Undefined dispose type
`imagick::DISPOSE_NONE` (int)
  No dispose type defined
`imagick::DISPOSE_BACKGROUND` (int)
  Dispose background
`imagick::DISPOSE_PREVIOUS` (int)
  Dispose previous

`COMPOSITE_*` constants
`imagick::COMPOSITE_DEFAULT` (int)
  The default composite operator
`imagick::COMPOSITE_UNDEFINED` (int)
  Undefined composite operator
`imagick::COMPOSITE_NO` (int)
  No composite operator defined
`imagick::COMPOSITE_ADD` (int)
  The result of image + image
`imagick::COMPOSITE_ATOP` (int)
  The result is the same shape as image, with composite image obscuring image where the image shapes overlap
`imagick::COMPOSITE_BLEND` (int)
  Blends the image
`imagick::COMPOSITE_BUMPMAP` (int)
  The same as COMPOSITE_MULTIPLY, except the source is converted to grayscale first.
`imagick::COMPOSITE_CLEAR` (int)
  Makes the target image transparent
`imagick::COMPOSITE_COLORBURN` (int)
  Darkens the destination image to reflect the source image
`imagick::COMPOSITE_COLORDODGE` (int)
  Brightens the destination image to reflect the source image
`imagick::COMPOSITE_COLORIZE` (int)
  Colorizes the target image using the composite image
`imagick::COMPOSITE_COPYBLACK` (int)
  Copies black from the source to target
`imagick::COMPOSITE_COPYBLUE` (int)
  Copies blue from the source to target
`imagick::COMPOSITE_COPY` (int)
  Copies the source image on the target image
`imagick::COMPOSITE_COPYCYAN` (int)
  Copies cyan from the source to target
`imagick::COMPOSITE_COPYGREEN` (int)
  Copies green from the source to target
`imagick::COMPOSITE_COPYMAGENTA` (int)
  Copies magenta from the source to target
`imagick::COMPOSITE_COPYOPACITY` (int)
  Copies opacity from the source to target
`imagick::COMPOSITE_COPYRED` (int)
  Copies red from the source to target
`imagick::COMPOSITE_COPYYELLOW` (int)
  Copies yellow from the source to target
`imagick::COMPOSITE_DARKEN` (int)
  Darkens the target image
`imagick::COMPOSITE_DSTATOP` (int)
  The part of the destination lying inside of the source is composited over the source and replaces the destination
`imagick::COMPOSITE_DST` (int)
  The target is left untouched
`imagick::COMPOSITE_DSTIN` (int)
  The parts inside the source replace the target
`imagick::COMPOSITE_DSTOUT` (int)
  The parts outside the source replace the target
`imagick::COMPOSITE_DSTOVER` (int)
  Target replaces the source
`imagick::COMPOSITE_DIFFERENCE` (int)
  Subtracts the darker of the two constituent colors from the lighter
`imagick::COMPOSITE_DISPLACE` (int)
  Shifts target image pixels as defined by the source
`imagick::COMPOSITE_DISSOLVE` (int)
  Dissolves the source in to the target
`imagick::COMPOSITE_EXCLUSION` (int)
  Produces an effect similar to that of imagick::COMPOSITE_DIFFERENCE, but appears as lower contrast
`imagick::COMPOSITE_HARDLIGHT` (int)
  Multiplies or screens the colors, dependent on the source color value
`imagick::COMPOSITE_HUE` (int)
  Modifies the hue of the target as defined by source
`imagick::COMPOSITE_IN` (int)
  Composites source into the target
`imagick::COMPOSITE_LIGHTEN` (int)
  Lightens the target as defined by source
`imagick::COMPOSITE_LUMINIZE` (int)
  Luminizes the target as defined by source
`imagick::COMPOSITE_MINUS` (int)
  Subtracts the source from the target
`imagick::COMPOSITE_MODULATE` (int)
  Modulates the target brightness, saturation and hue as defined by source
`imagick::COMPOSITE_MULTIPLY` (int)
  Multiplies the target to the source
`imagick::COMPOSITE_OUT` (int)
  Composites outer parts of the source on the target
`imagick::COMPOSITE_OVER` (int)
  Composites source over the target
`imagick::COMPOSITE_OVERLAY` (int)
  Overlays the source on the target
`imagick::COMPOSITE_PLUS` (int)
  Adds the source to the target
`imagick::COMPOSITE_REPLACE` (int)
  Replaces the target with the source
`imagick::COMPOSITE_SATURATE` (int)
  Saturates the target as defined by the source
`imagick::COMPOSITE_SCREEN` (int)
  The source and destination are complemented and then multiplied and then replace the destination
`imagick::COMPOSITE_SOFTLIGHT` (int)
  Darkens or lightens the colors, dependent on the source
`imagick::COMPOSITE_SRCATOP` (int)
  The part of the source lying inside of the destination is composited onto the destination
`imagick::COMPOSITE_SRC` (int)
  The source is copied to the destination
`imagick::COMPOSITE_SRCIN` (int)
  The part of the source lying inside of the destination replaces the destination
`imagick::COMPOSITE_SRCOUT` (int)
  The part of the source lying outside of the destination replaces the destination
`imagick::COMPOSITE_SRCOVER` (int)
  The source replaces the destination
`imagick::COMPOSITE_SUBTRACT` (int)
  Subtract the colors in the source image from the destination image
`imagick::COMPOSITE_THRESHOLD` (int)
  The source is composited on the target as defined by source threshold
`imagick::COMPOSITE_XOR` (int)
  The part of the source that lies outside of the destination is combined with the part of the destination that lies outside of the source

`MONTAGEMODE_*` constants

`imagick::MONTAGEMODE_FRAME` (int)
`imagick::MONTAGEMODE_UNFRAME` (int)
`imagick::MONTAGEMODE_CONCATENATE` (int)

`STYLE_*` constants

`imagick::STYLE_NORMAL` (int)
`imagick::STYLE_ITALIC` (int)
`imagick::STYLE_OBLIQUE` (int)
`imagick::STYLE_ANY` (int)

`FILTER_*` constants

`imagick::FILTER_UNDEFINED` (int)
`imagick::FILTER_POINT` (int)
`imagick::FILTER_BOX` (int)
`imagick::FILTER_TRIANGLE` (int)
`imagick::FILTER_HERMITE` (int)
`imagick::FILTER_HANNING` (int)
`imagick::FILTER_HAMMING` (int)
`imagick::FILTER_BLACKMAN` (int)
`imagick::FILTER_GAUSSIAN` (int)
`imagick::FILTER_QUADRATIC` (int)
`imagick::FILTER_CUBIC` (int)
`imagick::FILTER_CATROM` (int)
`imagick::FILTER_MITCHELL` (int)
`imagick::FILTER_LANCZOS` (int)
`imagick::FILTER_BESSEL` (int)
`imagick::FILTER_SINC` (int)

`IMGTYPE_*` constants

`imagick::IMGTYPE_UNDEFINED` (int)
`imagick::IMGTYPE_BILEVEL` (int)
`imagick::IMGTYPE_GRAYSCALE` (int)
`imagick::IMGTYPE_GRAYSCALEMATTE` (int)
`imagick::IMGTYPE_PALETTE` (int)
`imagick::IMGTYPE_PALETTEMATTE` (int)
`imagick::IMGTYPE_TRUECOLOR` (int)
`imagick::IMGTYPE_TRUECOLORMATTE` (int)
`imagick::IMGTYPE_COLORSEPARATION` (int)
`imagick::IMGTYPE_COLORSEPARATIONMATTE` (int)
`imagick::IMGTYPE_OPTIMIZE` (int)

`RESOLUTION_*` constants

`imagick::RESOLUTION_UNDEFINED` (int)
`imagick::RESOLUTION_PIXELSPERINCH` (int)
`imagick::RESOLUTION_PIXELSPERCENTIMETER` (int)

`COMPRESSION_*` constants

`imagick::COMPRESSION_UNDEFINED` (int)
`imagick::COMPRESSION_NO` (int)
`imagick::COMPRESSION_BZIP` (int)
`imagick::COMPRESSION_FAX` (int)
`imagick::COMPRESSION_GROUP4` (int)
`imagick::COMPRESSION_JPEG` (int)
`imagick::COMPRESSION_JPEG2000` (int)
`imagick::COMPRESSION_LOSSLESSJPEG` (int)
`imagick::COMPRESSION_LZW` (int)
`imagick::COMPRESSION_RLE` (int)
`imagick::COMPRESSION_ZIP` (int)
`imagick::COMPRESSION_DXT1` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.0 or higher.
`imagick::COMPRESSION_DXT3` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.0 or higher.
`imagick::COMPRESSION_DXT5` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.0 or higher.

`PAINT_*` constants

`imagick::PAINT_POINT` (int)
`imagick::PAINT_REPLACE` (int)
`imagick::PAINT_FLOODFILL` (int)
`imagick::PAINT_FILLTOBORDER` (int)
`imagick::PAINT_RESET` (int)

`GRAVITY_*` constants

`imagick::GRAVITY_NORTHWEST` (int)
`imagick::GRAVITY_NORTH` (int)
`imagick::GRAVITY_NORTHEAST` (int)
`imagick::GRAVITY_WEST` (int)
`imagick::GRAVITY_CENTER` (int)
`imagick::GRAVITY_EAST` (int)
`imagick::GRAVITY_SOUTHWEST` (int)
`imagick::GRAVITY_SOUTH` (int)
`imagick::GRAVITY_SOUTHEAST` (int)

`STRETCH_*` constants

`imagick::STRETCH_NORMAL` (int)
`imagick::STRETCH_ULTRACONDENSED` (int)
`imagick::STRETCH_CONDENSED` (int)
`imagick::STRETCH_SEMICONDENSED` (int)
`imagick::STRETCH_SEMIEXPANDED` (int)
`imagick::STRETCH_EXPANDED` (int)
`imagick::STRETCH_EXTRAEXPANDED` (int)
`imagick::STRETCH_ULTRAEXPANDED` (int)
`imagick::STRETCH_ANY` (int)

`ALIGN_*` constants

`imagick::ALIGN_UNDEFINED` (int)
`imagick::ALIGN_LEFT` (int)
`imagick::ALIGN_CENTER` (int)
`imagick::ALIGN_RIGHT` (int)

`DECORATION_*` constants

`imagick::DECORATION_NO` (int)
`imagick::DECORATION_UNDERLINE` (int)
`imagick::DECORATION_OVERLINE` (int)
`imagick::DECORATION_LINETROUGH` (int)

`NOISE_*` constants

`imagick::NOISE_UNIFORM` (int)
`imagick::NOISE_GAUSSIAN` (int)
`imagick::NOISE_MULTIPLICATIVEGAUSSIAN` (int)
`imagick::NOISE_IMPULSE` (int)
`imagick::NOISE_LAPLACIAN` (int)
`imagick::NOISE_POISSON` (int)
`imagick::NOISE_RANDOM` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.6 or higher.

`CHANNEL_*` constants

`imagick::CHANNEL_UNDEFINED` (int)
`imagick::CHANNEL_RED` (int)
`imagick::CHANNEL_GRAY` (int)
`imagick::CHANNEL_CYAN` (int)
`imagick::CHANNEL_GREEN` (int)
`imagick::CHANNEL_MAGENTA` (int)
`imagick::CHANNEL_BLUE` (int)
`imagick::CHANNEL_YELLOW` (int)
`imagick::CHANNEL_ALPHA` (int)
`imagick::CHANNEL_OPACITY` (int)
`imagick::CHANNEL_MATTE` (int)
`imagick::CHANNEL_BLACK` (int)
`imagick::CHANNEL_INDEX` (int)
`imagick::CHANNEL_ALL` (int)
`imagick::CHANNEL_DEFAULT` (int)

`METRIC_*` constants

`imagick::METRIC_UNDEFINED` (int)
`imagick::METRIC_MEANABSOLUTEERROR` (int)
`imagick::METRIC_MEANSQUAREERROR` (int)
`imagick::METRIC_PEAKABSOLUTEERROR` (int)
`imagick::METRIC_PEAKSIGNALTONOISERATIO` (int)
`imagick::METRIC_ROOTMEANSQUAREDERROR` (int)

`PIXEL_*` constants

`imagick::PIXEL_CHAR` (int)
`imagick::PIXEL_DOUBLE` (int)
`imagick::PIXEL_FLOAT` (int)
`imagick::PIXEL_INTEGER` (int)
  Only available for ImageMagick < 7.
`imagick::PIXEL_LONG` (int)
`imagick::PIXEL_QUANTUM` (int)
`imagick::PIXEL_SHORT` (int)

`EVALUATE_*` constants

`imagick::EVALUATE_UNDEFINED` (int)
`imagick::EVALUATE_ADD` (int)
`imagick::EVALUATE_AND` (int)
`imagick::EVALUATE_DIVIDE` (int)
`imagick::EVALUATE_LEFTSHIFT` (int)
`imagick::EVALUATE_MAX` (int)
`imagick::EVALUATE_MIN` (int)
`imagick::EVALUATE_MULTIPLY` (int)
`imagick::EVALUATE_OR` (int)
`imagick::EVALUATE_RIGHTSHIFT` (int)
`imagick::EVALUATE_SET` (int)
`imagick::EVALUATE_SUBTRACT` (int)
`imagick::EVALUATE_XOR` (int)
`imagick::EVALUATE_POW` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_LOG` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_THRESHOLD` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_THRESHOLDBLACK` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_THRESHOLDWHITE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_GAUSSIANNOISE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_IMPULSENOISE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_LAPLACIANNOISE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_MULTIPLICATIVENOISE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_POISSONNOISE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_UNIFORMNOISE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_COSINE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_SINE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.
`imagick::EVALUATE_ADDMODULUS` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.4 or higher.

`COLORSPACE_*` constants

`imagick::COLORSPACE_UNDEFINED` (int)
`imagick::COLORSPACE_RGB` (int)
`imagick::COLORSPACE_GRAY` (int)
`imagick::COLORSPACE_TRANSPARENT` (int)
`imagick::COLORSPACE_OHTA` (int)
`imagick::COLORSPACE_LAB` (int)
`imagick::COLORSPACE_XYZ` (int)
`imagick::COLORSPACE_YCBCR` (int)
`imagick::COLORSPACE_YCC` (int)
`imagick::COLORSPACE_YIQ` (int)
`imagick::COLORSPACE_YPBPR` (int)
`imagick::COLORSPACE_YUV` (int)
`imagick::COLORSPACE_CMYK` (int)
`imagick::COLORSPACE_SRGB` (int)
`imagick::COLORSPACE_HSB` (int)
`imagick::COLORSPACE_HSL` (int)
`imagick::COLORSPACE_HWB` (int)
`imagick::COLORSPACE_REC601LUMA` (int)
`imagick::COLORSPACE_REC709LUMA` (int)
`imagick::COLORSPACE_LOG` (int)
`imagick::COLORSPACE_CMY` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.2 or higher.

`VIRTUALPIXELMETHOD_*` constants

`imagick::VIRTUALPIXELMETHOD_UNDEFINED` (int)
`imagick::VIRTUALPIXELMETHOD_BACKGROUND` (int)
`imagick::VIRTUALPIXELMETHOD_CONSTANT` (int)
`imagick::VIRTUALPIXELMETHOD_EDGE` (int)
`imagick::VIRTUALPIXELMETHOD_MIRROR` (int)
`imagick::VIRTUALPIXELMETHOD_TILE` (int)
`imagick::VIRTUALPIXELMETHOD_TRANSPARENT` (int)
`imagick::VIRTUALPIXELMETHOD_MASK` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.2 or higher.
`imagick::VIRTUALPIXELMETHOD_BLACK` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.2 or higher.
`imagick::VIRTUALPIXELMETHOD_GRAY` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.2 or higher.
`imagick::VIRTUALPIXELMETHOD_WHITE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.2 or higher.
`imagick::VIRTUALPIXELMETHOD_HORIZONTALTILE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.3 or higher.
`imagick::VIRTUALPIXELMETHOD_VERTICALTILE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.3 or higher.

`PREVIEW_*` constants

`imagick::PREVIEW_UNDEFINED` (int)
`imagick::PREVIEW_ROTATE` (int)
`imagick::PREVIEW_SHEAR` (int)
`imagick::PREVIEW_ROLL` (int)
`imagick::PREVIEW_HUE` (int)
`imagick::PREVIEW_SATURATION` (int)
`imagick::PREVIEW_BRIGHTNESS` (int)
`imagick::PREVIEW_GAMMA` (int)
`imagick::PREVIEW_SPIFF` (int)
`imagick::PREVIEW_DULL` (int)
`imagick::PREVIEW_GRAYSCALE` (int)
`imagick::PREVIEW_QUANTIZE` (int)
`imagick::PREVIEW_DESPECKLE` (int)
`imagick::PREVIEW_REDUCENOISE` (int)
`imagick::PREVIEW_ADDNOISE` (int)
`imagick::PREVIEW_SHARPEN` (int)
`imagick::PREVIEW_BLUR` (int)
`imagick::PREVIEW_THRESHOLD` (int)
`imagick::PREVIEW_EDGEDETECT` (int)
`imagick::PREVIEW_SPREAD` (int)
`imagick::PREVIEW_SOLARIZE` (int)
`imagick::PREVIEW_SHADE` (int)
`imagick::PREVIEW_RAISE` (int)
`imagick::PREVIEW_SEGMENT` (int)
`imagick::PREVIEW_SWIRL` (int)
`imagick::PREVIEW_IMPLODE` (int)
`imagick::PREVIEW_WAVE` (int)
`imagick::PREVIEW_OILPAINT` (int)
`imagick::PREVIEW_CHARCOALDRAWING` (int)
`imagick::PREVIEW_JPEG` (int)

`RENDERINGINTENT_*` constants

`imagick::RENDERINGINTENT_UNDEFINED` (int)
`imagick::RENDERINGINTENT_SATURATION` (int)
`imagick::RENDERINGINTENT_PERCEPTUAL` (int)
`imagick::RENDERINGINTENT_ABSOLUTE` (int)
`imagick::RENDERINGINTENT_RELATIVE` (int)

`INTERLACE_*` constants

`imagick::INTERLACE_UNDEFINED` (int)
`imagick::INTERLACE_NO` (int)
`imagick::INTERLACE_LINE` (int)
`imagick::INTERLACE_PLANE` (int)
`imagick::INTERLACE_PARTITION` (int)
`imagick::INTERLACE_GIF` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.4 or higher.
`imagick::INTERLACE_JPEG` (int)
`imagick::INTERLACE_PNG` (int)

`FILLRULE_*` constants

`imagick::FILLRULE_UNDEFINED` (int)
`imagick::FILLRULE_EVENODD` (int)
`imagick::FILLRULE_NONZERO` (int)

`PATHUNITS_*` constants

`imagick::PATHUNITS_UNDEFINED` (int)
`imagick::PATHUNITS_USERSPACE` (int)
`imagick::PATHUNITS_USERSPACEONUSE` (int)
`imagick::PATHUNITS_OBJECTBOUNDINGBOX` (int)

`LINECAP_*` constants

`imagick::LINECAP_UNDEFINED` (int)
`imagick::LINECAP_BUTT` (int)
`imagick::LINECAP_ROUND` (int)
`imagick::LINECAP_SQUARE` (int)

`LINEJOIN_*` constants

`imagick::LINEJOIN_UNDEFINED` (int)
`imagick::LINEJOIN_MITER` (int)
`imagick::LINEJOIN_ROUND` (int)
`imagick::LINEJOIN_BEVEL` (int)

`RESOURCETYPE_*` constants

`imagick::RESOURCETYPE_UNDEFINED` (int)
`imagick::RESOURCETYPE_AREA` (int)
  Set the maximum width * height of an image that can reside in the pixel cache memory.
`imagick::RESOURCETYPE_DISK` (int)
  Set maximum amount of disk space in bytes permitted for use by the pixel cache.
`imagick::RESOURCETYPE_FILE` (int)
  Set maximum number of open pixel cache files.
`imagick::RESOURCETYPE_MAP` (int)
  Set maximum amount of memory map in bytes to allocate for the pixel cache.
`imagick::RESOURCETYPE_MEMORY` (int)
  Set maximum amount of memory in bytes to allocate for the pixel cache from the heap.
`imagick::RESOURCETYPE_THREAD` (int)
  Set maximum parallel threads. 此常量可用仅当Imagick编译于ImageMagick版本 6.7.8 or higher.

`LAYERMETHOD_*` constants

`imagick::LAYERMETHOD_UNDEFINED` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.2.9 or higher.
`imagick::LAYERMETHOD_COALESCE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.2.9 or higher.
`imagick::LAYERMETHOD_COMPAREANY` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.2.9 or higher.
`imagick::LAYERMETHOD_COMPARECLEAR` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.2.9 or higher.
`imagick::LAYERMETHOD_COMPAREOVERLAY` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.2.9 or higher.
`imagick::LAYERMETHOD_DISPOSE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.2.9 or higher.
`imagick::LAYERMETHOD_OPTIMIZE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.2.9 or higher.
`imagick::LAYERMETHOD_OPTIMIZEPLUS` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.2.9 or higher.
`imagick::LAYERMETHOD_OPTIMIZEIMAGE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::LAYERMETHOD_OPTIMIZETRANS` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::LAYERMETHOD_REMOVEDUPS` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::LAYERMETHOD_REMOVEZERO` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::LAYERMETHOD_COMPOSITE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::LAYERMETHOD_MERGE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.7 or higher.
`imagick::LAYERMETHOD_FLATTEN` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.7 or higher.
`imagick::LAYERMETHOD_MOSAIC` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.7 or higher.

`ORIENTATION_*` constants

`imagick::ORIENTATION_UNDEFINED` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::ORIENTATION_TOPLEFT` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::ORIENTATION_TOPRIGHT` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::ORIENTATION_BOTTOMRIGHT` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::ORIENTATION_BOTTOMLEFT` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::ORIENTATION_LEFTTOP` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::ORIENTATION_RIGHTTOP` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::ORIENTATION_RIGHTBOTTOM` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.
`imagick::ORIENTATION_LEFTBOTTOM` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.0 or higher.

`DISTORTION_*` constants

`imagick::DISTORTION_UNDEFINED` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.6 or higher.
`imagick::DISTORTION_AFFINE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.6 or higher.
`imagick::DISTORTION_AFFINEPROJECTION` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.6 or higher.
`imagick::DISTORTION_ARC` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.6 or higher.
`imagick::DISTORTION_BILINEAR` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.6 or higher.
`imagick::DISTORTION_PERSPECTIVE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.6 or higher.
`imagick::DISTORTION_PERSPECTIVEPROJECTION` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.6 or higher.
`imagick::DISTORTION_SCALEROTATETRANSLATE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.6 or higher.
`imagick::DISTORTION_POLYNOMIAL` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::DISTORTION_POLAR` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::DISTORTION_DEPOLAR` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::DISTORTION_BARREL` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::DISTORTION_BARRELINVERSE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::DISTORTION_SHEPARDS` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::DISTORTION_SENTINEL` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.

`ALPHACHANNEL_*` constants

`imagick::ALPHACHANNEL_ACTIVATE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.8 or higher.
`imagick::ALPHACHANNEL_DEACTIVATE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.8 or higher.
`imagick::ALPHACHANNEL_RESET` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.8 or higher.
`imagick::ALPHACHANNEL_SET` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.8 or higher.
`imagick::ALPHACHANNEL_UNDEFINED` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::ALPHACHANNEL_COPY` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::ALPHACHANNEL_EXTRACT` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::ALPHACHANNEL_OPAQUE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::ALPHACHANNEL_SHAPE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::ALPHACHANNEL_TRANSPARENT` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::ALPHACHANNEL_BACKGROUND` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.5.3 or higher.
`imagick::ALPHACHANNEL_REMOVE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.7.8 or higher.
`imagick::ALPHACHANNEL_ASSOCIATE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.9.0 or higher.
`imagick::ALPHACHANNEL_DISSOCIATE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.9.0 or higher.
`imagick::ALPHACHANNEL_ON` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 7.0.0 or higher.
`imagick::ALPHACHANNEL_OFF` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 7.0.0 or higher.
`imagick::ALPHACHANNEL_DISCRETE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 7.0.0 or higher.

`SPARSECOLORMETHOD_*` constants

`imagick::SPARSECOLORMETHOD_UNDEFINED` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::SPARSECOLORMETHOD_BARYCENTRIC` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::SPARSECOLORMETHOD_BILINEAR` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::SPARSECOLORMETHOD_POLYNOMIAL` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::SPARSECOLORMETHOD_SPEPARDS` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::SPARSECOLORMETHOD_VORONOI` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.

`FUNCTION_*` constants

`imagick::FUNCTION_UNDEFINED` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.9 or higher.
`imagick::FUNCTION_POLYNOMIAL` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.9 or higher.
`imagick::FUNCTION_SINUSOID` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.9 or higher.

`INTERPOLATE_*` constants

`imagick::INTERPOLATE_UNDEFINED` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.2 or higher.
`imagick::INTERPOLATE_AVERAGE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.2 or higher.
`imagick::INTERPOLATE_BICUBIC` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.2 or higher.
`imagick::INTERPOLATE_BILINEAR` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.2 or higher.
`imagick::INTERPOLATE_FILTER` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.2 or higher.
`imagick::INTERPOLATE_INTEGER` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.2 or higher.
`imagick::INTERPOLATE_MESH` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.2 or higher.
`imagick::INTERPOLATE_NEARESTNEIGHBOR` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.2 or higher.
`imagick::INTERPOLATE_SPLINE` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.3.4 or higher.

`DITHERMETHOD_*` constants

`imagick::DITHERMETHOD_UNDEFINED` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::DITHERMETHOD_NO` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::DITHERMETHOD_RIEMERSMA` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.
`imagick::DITHERMETHOD_FLOYDSTEINBERG` (int)
  此常量可用仅当Imagick编译于ImageMagick版本 6.4.6 or higher.

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