# Constants

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Constants — Imagick class constants

### Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

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

Dispose type constants
`imagick::DISPOSE_UNRECOGNIZED` (integer)
  Unrecognized
`imagick::DISPOSE_UNRECOGNIZED` (integer)
  Unrecognized
`imagick::DISPOSE_UNDEFINED` (integer)
  Undefined
`imagick::DISPOSE_NONE` (integer)
  None
`imagick::DISPOSE_BACKGROUND` (integer)
  Background
`imagick::DISPOSE_PREVIOUS` (integer)
  Previous

Composite Operator Constants
`imagick::COMPOSITE_OVER` (integer)
  Overlay one image over the next
`imagick::COMPOSITE_IN` (integer)
  Replaces the inside of one layer with another
`imagick::COMPOSITE_OUT` (integer)
  Replaces the outside of one layer with another
`imagick::COMPOSITE_ATOP` (integer)
  Composites the inside of one layer with the other
`imagick::COMPOSITE_XOR` (integer)
  The part of the source that lies outside of the destination is combined with the part of the destination that lies outside the source.
`imagick::COMPOSITE_PLUS` (integer)
  The source is added to the destination and replaces the destination.
`imagick::COMPOSITE_MINUS` (integer)
  The source is subtracted to the destination and replaces the destination.
`imagick::COMPOSITE_ADD` (integer)
  Deprecated
`imagick::COMPOSITE_SUBTRACT` (integer)
  Deprecated
`imagick::COMPOSITE_DIFFERENCE` (integer)
  The difference in color values. Good for comparing images.
`imagick::COMPOSITE_BUMPMAP` (integer)
  The same as COMPOSITE_MULTIPLY, except the source is converted to greyscale first.
`imagick::COMPOSITE_COPY` (integer)
  Simply place the source on top of the destination.
`imagick::COMPOSITE_DISPLACE` (integer)
`imagick::COMPOSITE_DEFAULT` (integer)

Montage Mode constants
`imagick::MONTAGEMODE_FRAME` (integer)
`imagick::MONTAGEMODE_UNFRAME` (integer)
`imagick::MONTAGEMODE_CONCATENATE` (integer)

Style constants
`imagick::STYLE_NORMAL` (integer)
`imagick::STYLE_ITALIC` (integer)
`imagick::STYLE_OBLIQUE` (integer)
`imagick::STYLE_ANY` (integer)

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

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

Resolution constants
`imagick::RESOLUTION_UNDEFINED` (integer)
`imagick::RESOLUTION_PIXELSPERINCH` (integer)
`imagick::RESOLUTION_PIXELSPERCENTIMETER` (integer)

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

Paint constants
`imagick::PAINT_POINT` (integer)
`imagick::PAINT_REPLACE` (integer)
`imagick::PAINT_FLOODFILL` (integer)
`imagick::PAINT_FILLTOBORDER` (integer)
`imagick::PAINT_RESET` (integer)

Gravity constants
`imagick::GRAVITY_NORTHWEST` (integer)
`imagick::GRAVITY_NORTH` (integer)
`imagick::GRAVITY_NORTHEAST` (integer)
`imagick::GRAVITY_WEST` (integer)
`imagick::GRAVITY_CENTER` (integer)
`imagick::GRAVITY_EAST` (integer)
`imagick::GRAVITY_SOUTHWEST` (integer)
`imagick::GRAVITY_SOUTH` (integer)
`imagick::GRAVITY_SOUTHEAST` (integer)

Stretch constants
`imagick::STRETCH_NORMAL` (integer)
`imagick::STRETCH_ULTRACONDENSED` (integer)
`imagick::STRETCH_CONDENSED` (integer)
`imagick::STRETCH_SEMICONDENSED` (integer)
`imagick::STRETCH_SEMIEXPANDED` (integer)
`imagick::STRETCH_EXPANDED` (integer)
`imagick::STRETCH_EXTRAEXPANDED` (integer)
`imagick::STRETCH_ULTRAEXPANDED` (integer)
`imagick::STRETCH_ANY` (integer)

Align constants
`imagick::ALIGN_UNDEFINED` (integer)
`imagick::ALIGN_LEFT` (integer)
`imagick::ALIGN_CENTER` (integer)
`imagick::ALIGN_RIGHT` (integer)

Decoration constants
`imagick::DECORATION_NO` (integer)
`imagick::DECORATION_UNDERLINE` (integer)
`imagick::DECORATION_OVERLINE` (integer)
`imagick::DECORATION_LINETROUGH` (integer)

Noise constants
`imagick::NOISE_UNIFORM` (integer)
`imagick::NOISE_GAUSSIAN` (integer)
`imagick::NOISE_MULTIPLICATIVEGAUSSIAN` (integer)
`imagick::NOISE_IMPULSE` (integer)
`imagick::NOISE_LAPLACIAN` (integer)
`imagick::NOISE_POISSON` (integer)

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

Metric constants
`imagick::METRIC_UNDEFINED` (integer)
`imagick::METRIC_MEANABSOLUTEERROR` (integer)
`imagick::METRIC_MEANSQUAREERROR` (integer)
`imagick::METRIC_PEAKABSOLUTEERROR` (integer)
`imagick::METRIC_PEAKSIGNALTONOISERATIO` (integer)
`imagick::METRIC_ROOTMEANSQUAREDERROR` (integer)

Pixel constants
`imagick::PIXEL_CHAR` (integer)
`imagick::PIXEL_DOUBLE` (integer)
`imagick::PIXEL_FLOAT` (integer)
`imagick::PIXEL_INTEGER` (integer)
`imagick::PIXEL_LONG` (integer)
`imagick::PIXEL_QUANTUM` (integer)
`imagick::PIXEL_SHORT` (integer)

Evaluate Operator constants
`imagick::EVALUATE_UNDEFINED` (integer)
`imagick::EVALUATE_ADD` (integer)
`imagick::EVALUATE_AND` (integer)
`imagick::EVALUATE_DIVIDE` (integer)
`imagick::EVALUATE_LEFTSHIFT` (integer)
`imagick::EVALUATE_MAX` (integer)
`imagick::EVALUATE_MIN` (integer)
`imagick::EVALUATE_MULTIPLY` (integer)
`imagick::EVALUATE_OR` (integer)
`imagick::EVALUATE_RIGHTSHIFT` (integer)
`imagick::EVALUATE_SET` (integer)
`imagick::EVALUATE_SUBTRACT` (integer)
`imagick::EVALUATE_XOR` (integer)

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

Virtual Pixel Method constants
`imagick::VIRTUALPIXELMETHOD_UNDEFINED` (integer)
`imagick::VIRTUALPIXELMETHOD_BACKGROUND` (integer)
`imagick::VIRTUALPIXELMETHOD_CONSTANT` (integer)
`imagick::VIRTUALPIXELMETHOD_EDGE` (integer)
`imagick::VIRTUALPIXELMETHOD_MIRROR` (integer)
`imagick::VIRTUALPIXELMETHOD_TILE` (integer)
`imagick::VIRTUALPIXELMETHOD_TRANSPARENT` (integer)

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

Rendering Intent constants
`imagick::RENDERINGINTENT_UNDEFINED` (integer)
`imagick::RENDERINGINTENT_SATURATION` (integer)
`imagick::RENDERINGINTENT_PERCEPTUAL` (integer)
`imagick::RENDERINGINTENT_ABSOLUTE` (integer)
`imagick::RENDERINGINTENT_RELATIVE` (integer)

Interlace constants (imagick::INTERLACE_GIF, imagick::INTERLACE_JPEG, imagick::INTERLACE_PNG are only available if Imagick is compiled against Imagemagick 6.3.5 or newer)
`imagick::INTERLACE_UNDEFINED` (integer)
`imagick::INTERLACE_NO` (integer)
`imagick::INTERLACE_LINE` (integer)
`imagick::INTERLACE_PLANE` (integer)
`imagick::INTERLACE_PARTITION` (integer)
`imagick::INTERLACE_JPEG` (integer)
`imagick::INTERLACE_GIF` (integer)
`imagick::INTERLACE_PNG` (integer)

Fillrule constants
`imagick::FILLRULE_UNDEFINED` (integer)
`imagick::FILLRULE_EVENODD` (integer)
`imagick::FILLRULE_NONZERO` (integer)

Pathunit constants
`imagick::PATHUNITS_UNDEFINED` (integer)
`imagick::PATHUNITS_USERSPACE` (integer)
`imagick::PATHUNITS_USERSPACEONUSE` (integer)
`imagick::PATHUNITS_OBJECTBOUNDINGBOX` (integer)

Linecap constants
`imagick::LINECAP_UNDEFINED` (integer)
`imagick::LINECAP_BUTT` (integer)
`imagick::LINECAP_ROUND` (integer)
`imagick::LINECAP_SQUARE` (integer)

Line Join constants
`imagick::LINEJOIN_UNDEFINED` (integer)
`imagick::LINEJOIN_MITER` (integer)
`imagick::LINEJOIN_ROUND` (integer)
`imagick::LINEJOIN_BEVEL` (integer)

Resourcetype constants
`imagick::RESOURCETYPE_UNDEFINED` (integer)
`imagick::RESOURCETYPE_AREA` (integer)
`imagick::RESOURCETYPE_DISK` (integer)
`imagick::RESOURCETYPE_FILE` (integer)
`imagick::RESOURCETYPE_MAP` (integer)
`imagick::RESOURCETYPE_MEMORY` (integer)

Layer Method constants (available if compiled against ImageMagick 6.3.3 or later)
`imagick::LAYERMETHOD_UNDEFINED` (integer)
`imagick::LAYERMETHOD_COALESCE` (integer)
`imagick::LAYERMETHOD_COMPAREANY` (integer)
`imagick::LAYERMETHOD_COMPARECLEAR` (integer)
`imagick::LAYERMETHOD_COMPAREOVERLAY` (integer)
`imagick::LAYERMETHOD_DISPOSE` (integer)
`imagick::LAYERMETHOD_OPTIMIZE` (integer)
`imagick::LAYERMETHOD_OPTIMIZEIMAGE` (integer)
`imagick::LAYERMETHOD_OPTIMIZEPLUS` (integer)
`imagick::LAYERMETHOD_OPTIMIZETRANS` (integer)
`imagick::LAYERMETHOD_REMOVEDUPS` (integer)
`imagick::LAYERMETHOD_REMOVEZERO` (integer)
`imagick::LAYERMETHOD_COMPOSITE` (integer)

Orientation constants (available if compiled against ImageMagick 6.3.4 or later)
`imagick::ORIENTATION_UNDEFINED` (integer)
`imagick::ORIENTATION_TOPLEFT` (integer)
`imagick::ORIENTATION_TOPRIGHT` (integer)
`imagick::ORIENTATION_BOTTOMRIGHT` (integer)
`imagick::ORIENTATION_BOTTOMLEFT` (integer)
`imagick::ORIENTATION_LEFTTOP` (integer)
`imagick::ORIENTATION_RIGHTTOP` (integer)
`imagick::ORIENTATION_RIGHTBOTTOM` (integer)
`imagick::ORIENTATION_LEFTBOTTOM` (integer)

Distortion constants (available if compiled against ImageMagick 6.3.6 or later)
`imagick::DISTORTION_UNDEFINED` (integer)
`imagick::DISTORTION_AFFINE` (integer)
`imagick::DISTORTION_AFFINEPROJECTION` (integer)
`imagick::DISTORTION_ARC` (integer)
`imagick::DISTORTION_BILINEAR` (integer)
`imagick::DISTORTION_PERSPECTIVE` (integer)
`imagick::DISTORTION_PERSPECTIVEPROJECTION` (integer)
`imagick::DISTORTION_SCALEROTATETRANSLATE` (integer)