# 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。

Colortype constants
`Gmagick::COLOR_BLACK` (int)
  Black
`Gmagick::COLOR_BLUE` (int)
  Blue
`Gmagick::COLOR_CYAN` (int)
  Cyan
`Gmagick::COLOR_GREEN` (int)
  Green
`Gmagick::COLOR_RED` (int)
  Red
`Gmagick::COLOR_YELLOW` (int)
  Yellow
`Gmagick::COLOR_MAGENTA` (int)
  Magenta
`Gmagick::COLOR_OPACITY` (int)
  Opacity
`Gmagick::COLOR_ALPHA` (int)
  Alpha
`Gmagick::COLOR_FUZZ` (int)
  Fuzz

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

Montage Mode constants
`Gmagick::MONTAGEMODE_FRAME` (int)
`Gmagick::MONTAGEMODE_UNFRAME` (int)
`Gmagick::MONTAGEMODE_CONCATENATE` (int)

Style constants
`Gmagick::STYLE_NORMAL` (int)
`Gmagick::STYLE_ITALIC` (int)
`Gmagick::STYLE_OBLIQUE` (int)
`Gmagick::STYLE_ANY` (int)

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

Image type constants
`Gmagick::IMGTYPE_UNDEFINED` (int)
`Gmagick::IMGTYPE_BILEVEL` (int)
`Gmagick::IMGTYPE_GRAYSCALE` (int)
`Gmagick::IMGTYPE_GRAYSCALEMATTE` (int)
`Gmagick::IMGTYPE_PALETTE` (int)
`Gmagick::IMGTYPE_PALETTEMATTE` (int)
`Gmagick::IMGTYPE_TRUECOLOR` (int)
`Gmagick::IMGTYPE_TRUECOLORMATTE` (int)
`Gmagick::IMGTYPE_COLORSEPARATION` (int)
`Gmagick::IMGTYPE_COLORSEPARATIONMATTE` (int)
`Gmagick::IMGTYPE_OPTIMIZE` (int)

Resolution constants
`Gmagick::RESOLUTION_UNDEFINED` (int)
`Gmagick::RESOLUTION_PIXELSPERINCH` (int)
`Gmagick::RESOLUTION_PIXELSPERCENTIMETER` (int)

Compression constants
`Gmagick::COMPRESSION_UNDEFINED` (int)
`Gmagick::COMPRESSION_NO` (int)
`Gmagick::COMPRESSION_BZIP` (int)
`Gmagick::COMPRESSION_FAX` (int)
`Gmagick::COMPRESSION_GROUP4` (int)
`Gmagick::COMPRESSION_JPEG` (int)
`Gmagick::COMPRESSION_JPEG2000` (int)
`Gmagick::COMPRESSION_LOSSLESSJPEG` (int)
`Gmagick::COMPRESSION_LZW` (int)
`Gmagick::COMPRESSION_RLE` (int)
`Gmagick::COMPRESSION_ZIP` (int)

Paint constants
`Gmagick::PAINT_POINT` (int)
`Gmagick::PAINT_REPLACE` (int)
`Gmagick::PAINT_FLOODFILL` (int)
`Gmagick::PAINT_FILLTOBORDER` (int)
`Gmagick::PAINT_RESET` (int)

Gravity constants
`Gmagick::GRAVITY_NORTHWEST` (int)
`Gmagick::GRAVITY_NORTH` (int)
`Gmagick::GRAVITY_NORTHEAST` (int)
`Gmagick::GRAVITY_WEST` (int)
`Gmagick::GRAVITY_CENTER` (int)
`Gmagick::GRAVITY_EAST` (int)
`Gmagick::GRAVITY_SOUTHWEST` (int)
`Gmagick::GRAVITY_SOUTH` (int)
`Gmagick::GRAVITY_SOUTHEAST` (int)

Stretch constants
`Gmagick::STRETCH_NORMAL` (int)
`Gmagick::STRETCH_ULTRACONDENSED` (int)
`Gmagick::STRETCH_CONDENSED` (int)
`Gmagick::STRETCH_SEMICONDENSED` (int)
`Gmagick::STRETCH_SEMIEXPANDED` (int)
`Gmagick::STRETCH_EXPANDED` (int)
`Gmagick::STRETCH_EXTRAEXPANDED` (int)
`Gmagick::STRETCH_ULTRAEXPANDED` (int)
`Gmagick::STRETCH_ANY` (int)

Align constants
`Gmagick::ALIGN_UNDEFINED` (int)
`Gmagick::ALIGN_LEFT` (int)
`Gmagick::ALIGN_CENTER` (int)
`Gmagick::ALIGN_RIGHT` (int)

Decoration constants
`Gmagick::DECORATION_NO` (int)
`Gmagick::DECORATION_UNDERLINE` (int)
`Gmagick::DECORATION_OVERLINE` (int)
`Gmagick::DECORATION_LINETROUGH` (int)

Noise constants
`Gmagick::NOISE_UNIFORM` (int)
`Gmagick::NOISE_GAUSSIAN` (int)
`Gmagick::NOISE_MULTIPLICATIVEGAUSSIAN` (int)
`Gmagick::NOISE_IMPULSE` (int)
`Gmagick::NOISE_LAPLACIAN` (int)
`Gmagick::NOISE_POISSON` (int)

Channel constants
`Gmagick::CHANNEL_UNDEFINED` (int)
`Gmagick::CHANNEL_RED` (int)
`Gmagick::CHANNEL_GRAY` (int)
`Gmagick::CHANNEL_CYAN` (int)
`Gmagick::CHANNEL_GREEN` (int)
`Gmagick::CHANNEL_MAGENTA` (int)
`Gmagick::CHANNEL_BLUE` (int)
`Gmagick::CHANNEL_YELLOW` (int)
`Gmagick::CHANNEL_ALPHA` (int)
`Gmagick::CHANNEL_OPACITY` (int)
`Gmagick::CHANNEL_MATTE` (int)
`Gmagick::CHANNEL_BLACK` (int)
`Gmagick::CHANNEL_INDEX` (int)
`Gmagick::CHANNEL_ALL` (int)

Metric constants
`Gmagick::METRIC_UNDEFINED` (int)
`Gmagick::METRIC_MEANABSOLUTEERROR` (int)
`Gmagick::METRIC_MEANSQUAREERROR` (int)
`Gmagick::METRIC_PEAKABSOLUTEERROR` (int)
`Gmagick::METRIC_PEAKSIGNALTONOISERATIO` (int)
`Gmagick::METRIC_ROOTMEANSQUAREDERROR` (int)

Pixel constants
`Gmagick::PIXEL_CHAR` (int)
`Gmagick::PIXEL_DOUBLE` (int)
`Gmagick::PIXEL_FLOAT` (int)
`Gmagick::PIXEL_INTEGER` (int)
`Gmagick::PIXEL_LONG` (int)
`Gmagick::PIXEL_QUANTUM` (int)
`Gmagick::PIXEL_SHORT` (int)

Colorspace constants
`Gmagick::COLORSPACE_UNDEFINED` (int)
`Gmagick::COLORSPACE_RGB` (int)
`Gmagick::COLORSPACE_GRAY` (int)
`Gmagick::COLORSPACE_TRANSPARENT` (int)
`Gmagick::COLORSPACE_OHTA` (int)
`Gmagick::COLORSPACE_LAB` (int)
`Gmagick::COLORSPACE_XYZ` (int)
`Gmagick::COLORSPACE_YCBCR` (int)
`Gmagick::COLORSPACE_YCC` (int)
`Gmagick::COLORSPACE_YIQ` (int)
`Gmagick::COLORSPACE_YPBPR` (int)
`Gmagick::COLORSPACE_YUV` (int)
`Gmagick::COLORSPACE_CMYK` (int)
`Gmagick::COLORSPACE_SRGB` (int)
`Gmagick::COLORSPACE_HSB` (int)
`Gmagick::COLORSPACE_HSL` (int)
`Gmagick::COLORSPACE_HWB` (int)
`Gmagick::COLORSPACE_REC601LUMA` (int)
`Gmagick::COLORSPACE_REC709LUMA` (int)
`Gmagick::COLORSPACE_LOG` (int)

Virtual Pixel Method constants
`Gmagick::VIRTUALPIXELMETHOD_UNDEFINED` (int)
`Gmagick::VIRTUALPIXELMETHOD_BACKGROUND` (int)
`Gmagick::VIRTUALPIXELMETHOD_CONSTANT` (int)
`Gmagick::VIRTUALPIXELMETHOD_EDGE` (int)
`Gmagick::VIRTUALPIXELMETHOD_MIRROR` (int)
`Gmagick::VIRTUALPIXELMETHOD_TILE` (int)
`Gmagick::VIRTUALPIXELMETHOD_TRANSPARENT` (int)

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

Rendering Intent constants
`Gmagick::RENDERINGINTENT_UNDEFINED` (int)
`Gmagick::RENDERINGINTENT_SATURATION` (int)
`Gmagick::RENDERINGINTENT_PERCEPTUAL` (int)
`Gmagick::RENDERINGINTENT_ABSOLUTE` (int)
`Gmagick::RENDERINGINTENT_RELATIVE` (int)

Fillrule constants
`Gmagick::FILLRULE_UNDEFINED` (int)
`Gmagick::FILLRULE_EVENODD` (int)
`Gmagick::FILLRULE_NONZERO` (int)

Pathunit constants
`Gmagick::PATHUNITS_UNDEFINED` (int)
`Gmagick::PATHUNITS_USERSPACE` (int)
`Gmagick::PATHUNITS_USERSPACEONUSE` (int)
`Gmagick::PATHUNITS_OBJECTBOUNDINGBOX` (int)

Linecap constants
`Gmagick::LINECAP_UNDEFINED` (int)
`Gmagick::LINECAP_BUTT` (int)
`Gmagick::LINECAP_ROUND` (int)
`Gmagick::LINECAP_SQUARE` (int)

Line Join constants
`Gmagick::LINEJOIN_UNDEFINED` (int)
`Gmagick::LINEJOIN_MITER` (int)
`Gmagick::LINEJOIN_ROUND` (int)
`Gmagick::LINEJOIN_BEVEL` (int)

Resourcetype constants
`Gmagick::RESOURCETYPE_UNDEFINED` (int)
`Gmagick::RESOURCETYPE_AREA` (int)
`Gmagick::RESOURCETYPE_DISK` (int)
`Gmagick::RESOURCETYPE_FILE` (int)
`Gmagick::RESOURCETYPE_MAP` (int)
`Gmagick::RESOURCETYPE_MEMORY` (int)

Orientation constants
`Gmagick::ORIENTATION_UNDEFINED` (int)
`Gmagick::ORIENTATION_TOPLEFT` (int)
`Gmagick::ORIENTATION_TOPRIGHT` (int)
`Gmagick::ORIENTATION_BOTTOMRIGHT` (int)
`Gmagick::ORIENTATION_BOTTOMLEFT` (int)
`Gmagick::ORIENTATION_LEFTTOP` (int)
`Gmagick::ORIENTATION_RIGHTTOP` (int)
`Gmagick::ORIENTATION_RIGHTBOTTOM` (int)
`Gmagick::ORIENTATION_LEFTBOTTOM` (int)

Interlace constants
`Gmagick::INTERLACE_UNDEFINED` (int)
`Gmagick::INTERLACE_NO` (int)
`Gmagick::INTERLACE_NONE` (int)
`Gmagick::INTERLACE_LINE` (int)
`Gmagick::INTERLACE_PLANE` (int)
`Gmagick::INTERLACE_PARTITION` (int)

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