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COLOR_* constants

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Colortype constants. These constants are mainly used with ImagickPixel.

Predefined Constants Constants

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

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

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

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

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

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)

imagick::IMGTYPE_UNDEFINED (int): The image type is not known. Imagick::setImageType converts nothing for this value, but still records it on the image.
imagick::IMGTYPE_BILEVEL (int): Two colors only. The image is converted to grayscale, its contrast is stretched, and every pixel becomes either black or white depending on whether it is lighter or darker than mid-gray; any alpha channel is discarded.
imagick::IMGTYPE_GRAYSCALE (int): Shades of gray. The image is converted to the grayscale colorspace, and any alpha channel is discarded.
imagick::IMGTYPE_GRAYSCALEMATTE (int): Shades of gray with an alpha channel. The same as imagick::IMGTYPE_GRAYSCALE, except that the alpha channel is kept, and if the image has none, an opaque one is added.
imagick::IMGTYPE_PALETTE (int): Indexed color. The image is converted to sRGB and, if it is not already indexed or has more than 256 colors, it is quantized to 256 colors; any alpha channel is discarded.
imagick::IMGTYPE_PALETTEMATTE (int): Indexed color with an alpha channel. The image is converted to sRGB, the alpha channel is kept, and if the image has none, an opaque one is added. Unlike imagick::IMGTYPE_PALETTE, the colors are quantized even when the image is already indexed, and the alpha channel is included in the quantization.
imagick::IMGTYPE_TRUECOLOR (int): Direct color: one red, green, and blue value per pixel, with no palette. The image is converted to sRGB, and any alpha channel is discarded.
imagick::IMGTYPE_TRUECOLORMATTE (int): Direct color with an alpha channel. The same as imagick::IMGTYPE_TRUECOLOR, except that the alpha channel is kept, and if the image has none, an opaque one is added.
imagick::IMGTYPE_COLORSEPARATION (int): One channel per printing ink, with no palette. The image is converted to the CMYK colorspace, and any alpha channel is discarded.
imagick::IMGTYPE_COLORSEPARATIONMATTE (int): One channel per printing ink, with no palette, plus an alpha channel. The same as imagick::IMGTYPE_COLORSEPARATION, except that the alpha channel is kept, and if the image has none, an opaque one is added.
imagick::IMGTYPE_PALETTEBILEVELMATTE (int): Indexed color with a fully transparent or fully opaque alpha channel. The image is converted to sRGB, an opaque alpha channel is added if it has none, that channel alone is reduced to two values, and the colors are then quantized. This is the type of a PNG using binary transparency.
imagick::IMGTYPE_OPTIMIZE (int): Imagick::setImageType converts nothing for this value, but still records it on the image.

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

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): Available 6.4.0 or higher.
imagick::COMPRESSION_DXT3 (int): Available 6.4.0 or higher.
imagick::COMPRESSION_DXT5 (int): Available 6.4.0 or higher.

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

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)

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)

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

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

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): Available 6.3.6 or higher.

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)

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

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)

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): Available 6.4.4 or higher.
imagick::EVALUATE_LOG (int): Available 6.4.4 or higher.
imagick::EVALUATE_THRESHOLD (int): Available 6.4.4 or higher.
imagick::EVALUATE_THRESHOLDBLACK (int): Available 6.4.4 or higher.
imagick::EVALUATE_THRESHOLDWHITE (int): Available 6.4.4 or higher.
imagick::EVALUATE_GAUSSIANNOISE (int): Available 6.4.4 or higher.
imagick::EVALUATE_IMPULSENOISE (int): Available 6.4.4 or higher.
imagick::EVALUATE_LAPLACIANNOISE (int): Available 6.4.4 or higher.
imagick::EVALUATE_MULTIPLICATIVENOISE (int): Available 6.4.4 or higher.
imagick::EVALUATE_POISSONNOISE (int): Available 6.4.4 or higher.
imagick::EVALUATE_UNIFORMNOISE (int): Available 6.4.4 or higher.
imagick::EVALUATE_COSINE (int): Available 6.4.4 or higher.
imagick::EVALUATE_SINE (int): Available 6.4.4 or higher.
imagick::EVALUATE_ADDMODULUS (int): Available 6.4.4 or higher.

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): Available 6.4.2 or higher.

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): Available 6.4.2 or higher.
imagick::VIRTUALPIXELMETHOD_BLACK (int): Available 6.4.2 or higher.
imagick::VIRTUALPIXELMETHOD_GRAY (int): Available 6.4.2 or higher.
imagick::VIRTUALPIXELMETHOD_WHITE (int): Available 6.4.2 or higher.
imagick::VIRTUALPIXELMETHOD_HORIZONTALTILE (int): Available 6.4.3 or higher.
imagick::VIRTUALPIXELMETHOD_VERTICALTILE (int): Available 6.4.3 or higher.

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)

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

imagick::INTERLACE_UNDEFINED (int)
imagick::INTERLACE_NO (int)
imagick::INTERLACE_LINE (int)
imagick::INTERLACE_PLANE (int)
imagick::INTERLACE_PARTITION (int)
imagick::INTERLACE_GIF (int): Available 6.3.4 or higher.
imagick::INTERLACE_JPEG (int)
imagick::INTERLACE_PNG (int)

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

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

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

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

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. Available 6.7.8 or higher.

imagick::LAYERMETHOD_UNDEFINED (int): Available 6.2.9 or higher.
imagick::LAYERMETHOD_COALESCE (int): Available 6.2.9 or higher.
imagick::LAYERMETHOD_COMPAREANY (int): Available 6.2.9 or higher.
imagick::LAYERMETHOD_COMPARECLEAR (int): Available 6.2.9 or higher.
imagick::LAYERMETHOD_COMPAREOVERLAY (int): Available 6.2.9 or higher.
imagick::LAYERMETHOD_DISPOSE (int): Available 6.2.9 or higher.
imagick::LAYERMETHOD_OPTIMIZE (int): Available 6.2.9 or higher.
imagick::LAYERMETHOD_OPTIMIZEPLUS (int): Available 6.2.9 or higher.
imagick::LAYERMETHOD_OPTIMIZEIMAGE (int): Available 6.3.0 or higher.
imagick::LAYERMETHOD_OPTIMIZETRANS (int): Available 6.3.0 or higher.
imagick::LAYERMETHOD_REMOVEDUPS (int): Available 6.3.0 or higher.
imagick::LAYERMETHOD_REMOVEZERO (int): Available 6.3.0 or higher.
imagick::LAYERMETHOD_COMPOSITE (int): Available 6.3.0 or higher.
imagick::LAYERMETHOD_MERGE (int): Available 6.3.7 or higher.
imagick::LAYERMETHOD_FLATTEN (int): Available 6.3.7 or higher.
imagick::LAYERMETHOD_MOSAIC (int): Available 6.3.7 or higher.

imagick::ORIENTATION_UNDEFINED (int): Available 6.3.0 or higher.
imagick::ORIENTATION_TOPLEFT (int): Available 6.3.0 or higher.
imagick::ORIENTATION_TOPRIGHT (int): Available 6.3.0 or higher.
imagick::ORIENTATION_BOTTOMRIGHT (int): Available 6.3.0 or higher.
imagick::ORIENTATION_BOTTOMLEFT (int): Available 6.3.0 or higher.
imagick::ORIENTATION_LEFTTOP (int): Available 6.3.0 or higher.
imagick::ORIENTATION_RIGHTTOP (int): Available 6.3.0 or higher.
imagick::ORIENTATION_RIGHTBOTTOM (int): Available 6.3.0 or higher.
imagick::ORIENTATION_LEFTBOTTOM (int): Available 6.3.0 or higher.

imagick::DISTORTION_UNDEFINED (int): Available 6.3.6 or higher.
imagick::DISTORTION_AFFINE (int): Available 6.3.6 or higher.
imagick::DISTORTION_AFFINEPROJECTION (int): Available 6.3.6 or higher.
imagick::DISTORTION_ARC (int): Available 6.3.6 or higher.
imagick::DISTORTION_BILINEAR (int): Available 6.3.6 or higher.
imagick::DISTORTION_PERSPECTIVE (int): Available 6.3.6 or higher.
imagick::DISTORTION_PERSPECTIVEPROJECTION (int): Available 6.3.6 or higher.
imagick::DISTORTION_SCALEROTATETRANSLATE (int): Available 6.3.6 or higher.
imagick::DISTORTION_POLYNOMIAL (int): Available 6.4.6 or higher.
imagick::DISTORTION_POLAR (int): Available 6.4.6 or higher.
imagick::DISTORTION_DEPOLAR (int): Available 6.4.6 or higher.
imagick::DISTORTION_BARREL (int): Available 6.4.6 or higher.
imagick::DISTORTION_BARRELINVERSE (int): Available 6.4.6 or higher.
imagick::DISTORTION_SHEPARDS (int): Available 6.4.6 or higher.
imagick::DISTORTION_SENTINEL (int): Available 6.4.6 or higher.

imagick::ALPHACHANNEL_ACTIVATE (int): Available 6.3.8 or higher.
imagick::ALPHACHANNEL_DEACTIVATE (int): Available 6.3.8 or higher.
imagick::ALPHACHANNEL_RESET (int): Available 6.3.8 or higher.
imagick::ALPHACHANNEL_SET (int): Available 6.3.8 or higher.
imagick::ALPHACHANNEL_UNDEFINED (int): Available 6.4.6 or higher.
imagick::ALPHACHANNEL_COPY (int): Available 6.4.6 or higher.
imagick::ALPHACHANNEL_EXTRACT (int): Available 6.4.6 or higher.
imagick::ALPHACHANNEL_OPAQUE (int): Available 6.4.6 or higher.
imagick::ALPHACHANNEL_SHAPE (int): Available 6.4.6 or higher.
imagick::ALPHACHANNEL_TRANSPARENT (int): Available 6.4.6 or higher.
imagick::ALPHACHANNEL_BACKGROUND (int): Available 6.5.3 or higher.
imagick::ALPHACHANNEL_REMOVE (int): Available 6.7.8 or higher.
imagick::ALPHACHANNEL_ASSOCIATE (int): Available 6.9.0 or higher.
imagick::ALPHACHANNEL_DISSOCIATE (int): Available 6.9.0 or higher.
imagick::ALPHACHANNEL_ON (int): Available 7.0.0 or higher.
imagick::ALPHACHANNEL_OFF (int): Available 7.0.0 or higher.
imagick::ALPHACHANNEL_DISCRETE (int): Available 7.0.0 or higher.

imagick::SPARSECOLORMETHOD_UNDEFINED (int): Available 6.4.6 or higher.
imagick::SPARSECOLORMETHOD_BARYCENTRIC (int): Available 6.4.6 or higher.
imagick::SPARSECOLORMETHOD_BILINEAR (int): Available 6.4.6 or higher.
imagick::SPARSECOLORMETHOD_POLYNOMIAL (int): Available 6.4.6 or higher.
imagick::SPARSECOLORMETHOD_SPEPARDS (int): Available 6.4.6 or higher.
imagick::SPARSECOLORMETHOD_VORONOI (int): Available 6.4.6 or higher.

imagick::FUNCTION_UNDEFINED (int): Available 6.4.9 or higher.
imagick::FUNCTION_POLYNOMIAL (int): Available 6.4.9 or higher.
imagick::FUNCTION_SINUSOID (int): Available 6.4.9 or higher.

imagick::INTERPOLATE_UNDEFINED (int): Available 6.3.2 or higher.
imagick::INTERPOLATE_AVERAGE (int): Available 6.3.2 or higher.
imagick::INTERPOLATE_BICUBIC (int): Available 6.3.2 or higher.
imagick::INTERPOLATE_BILINEAR (int): Available 6.3.2 or higher.
imagick::INTERPOLATE_FILTER (int): Available 6.3.2 or higher.
imagick::INTERPOLATE_INTEGER (int): Available 6.3.2 or higher.
imagick::INTERPOLATE_MESH (int): Available 6.3.2 or higher.
imagick::INTERPOLATE_NEARESTNEIGHBOR (int): Available 6.3.2 or higher.
imagick::INTERPOLATE_SPLINE (int): Available 6.3.4 or higher.

imagick::DITHERMETHOD_UNDEFINED (int): Available 6.4.6 or higher.
imagick::DITHERMETHOD_NO (int): Available 6.4.6 or higher.
imagick::DITHERMETHOD_RIEMERSMA (int): Available 6.4.6 or higher.
imagick::DITHERMETHOD_FLOYDSTEINBERG (int): Available 6.4.6 or higher.

Source: reference/imagick/constants.xml · from the official PHP manual (php/doc-en)