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UndefinedClass | Unset value. |
DirectClass | Image is composed of pixels which represent literal color values. |
PseudoClass | Image is composed of pixels which specify an index in a color palette. |
When encoding an output image, the colorspaces RGBColorspace,
CMYKColorspace,
and GRAYColorspace may be specified. The
CMYKColorspace option
is only applicable when writing TIFF, JPEG, and Adobe Photoshop bitmap
(PSD) files.
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UndefinedColorspace | Unset value. |
RGBColorspace | Red-Green-Blue colorspace. |
GRAYColorspace | |
TransparentColorspace | The Transparent color space behaves uniquely in that it preserves the matte channel of the image if it exists. |
OHTAColorspace | |
XYZColorspace | |
YCbCrColorspace | |
YCCColorspace | |
YIQColorspace | |
YPbPrColorspace | |
YUVColorspace | Y-signal, U-signal, and V-signal colorspace. YUV is most widely used to encode color for use in television transmission. |
CMYKColorspace | Cyan-Magenta-Yellow-Black colorspace. CYMK is a subtractive color system used by printers and photographers for the rendering of colors with ink or emulsion, normally on a white surface. |
sRGBColorspace |
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UndefinedCompositeOp | Unset value. |
OverCompositeOp | The result is the union of the the two image shapes with the composite image obscuring image in the region of overlap. |
InCompositeOp | The result is a simply composite image cut by the shape of image. None of the image data of image is included in the result. |
OutCompositeOp | The resulting image is composite image with the shape of image cut out. |
AtopCompositeOp | The result is the same shape as image image, with composite image obscuring image there the image shapes overlap. Note that this differs from OverCompositeOp because the portion of composite image outside of image's shape does not appear in the result. |
XorCompositeOp | The result is the image data from both composite image and image that is outside the overlap region. The overlap region will be blank. |
PlusCompositeOp | The result is just the sum of the image data. Output values are cropped to 255 (no overflow). This operation is independent of the matte channels. |
MinusCompositeOp | The result of composite image - image, with overflow cropped to zero. The matte chanel is ignored (set to 255, full coverage). |
AddCompositeOp | The result of composite image + image, with overflow wrapping around (mod 256). |
SubtractCompositeOp | The result of composite image - image, with underflow wrapping around (mod 256). The add and subtract operators can be used to perform reverible transformations. |
DifferenceCompositeOp | The result of abs(composite image - image). This is useful for comparing two very similar images. |
BumpmapCompositeOp | The result image shaded by composite image. |
ReplaceCompositeOp | The resulting image is image replaced with composite image. Here the matte information is ignored. |
ReplaceRedCompositeOp | The resulting image is the red layer in image replaced with the red layer in composite image. The other layers are copied untouched. |
ReplaceGreenCompositeOp | The resulting image is the green layer in image replaced with the green layer in composite image. The other layers are copied untouched. |
ReplaceBlueCompositeOp | The resulting image is the blue layer in image replaced with the blue layer in composite image. The other layers are copied untouched. |
ReplaceMatteCompositeOp | The resulting image is the matte layer in image replaced with
the matte layer in composite image. The other layers are copied
untouched.
The image compositor requires a matte, or alpha channel in the image for some operations. This extra channel usually defines a mask which represents a sort of a cookie-cutter for the image. This is the case when matte is 255 (full coverage) for pixels inside the shape, zero outside, and between zero and 255 on the boundary. For certain operations, if image does not have a matte channel, it is initialized with 0 for any pixel matching in color to pixel location (0,0), otherwise 255 (to work properly borderWidth must be 0). |
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UndefinedCompression | Unset value. |
NoCompression | No compression |
BZipCompression | BZip (Burrows-Wheeler block-sorting text compression algorithm and Huffman coding) as used by bzip2 utilities |
FaxCompression | CCITT Group 3 FAX compression |
Group4Compression | CCITT Group 4 FAX compression (used only for TIFF) |
JPEGCompression | JPEG compression |
LZWCompression | Lempel-Ziv-Welch (LZW) compression (caution, patented by Unisys) |
RunlengthEncodedCompression | Run-Length encoded (RLE) compression |
ZipCompression | Lempel-Ziv compression (LZ77) as used in PKZIP and GNU gzip. |
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UndefinedFilter | Unset value. |
PointFilter | Point Filter |
BoxFilter | Box Filter |
TriangleFilter | Triangle Filter |
HermiteFilter | Hermite Filter |
HanningFilter | Hanning Filter |
HammingFilter | Hamming Filter |
BlackmanFilter | Blackman Filter |
GaussianFilter | Gaussian Filter |
QuadraticFilter | Quadratic Filter |
CubicFilter | Cubic Filter |
CatromFilter | Catrom Filter |
MitchellFilter | Mitchell Filter |
LanczosFilter | Lanczos Filter |
BesselFilter | Bessel Filter |
SincFilter | Sinc Filter |
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ForgetGravity | Don't use gravity. |
NorthWestGravity | Position object at top-left of region. |
NorthGravity | Postiion object at top-center of region |
NorthEastGravity | Position object at top-right of region |
WestGravity | Position object at left-center of region |
CenterGravity | Position object at center of region |
EastGravity | Position object at right-center of region |
SouthWestGravity | Position object at left-bottom of region |
SouthGravity | Position object at bottom-center of region |
SouthEastGravity | Position object at bottom-right of region |
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UndefinedType | Unset value. |
BilevelType | Monochrome image |
GrayscaleType | Grayscale image |
PaletteType | Indexed color (palette) image |
TrueColorType | Truecolor image |
MatteType | Truecolor with opacity image |
ColorSeparationType | Cyan/Yellow/Magenta/Black (CYMK) image |
Use LineInterlace or PlaneInterlace to create an interlaced
GIF or progressive JPEG image.
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UndefinedInterlace | Unset value. |
NoInterlace | Don't interlace image (RGBRGBRGBRGBRGBRGB...) |
LineInterlace | Use scanline interlacing (RRR...GGG...BBB...RRR...GGG...BBB...) |
PlaneInterlace | Use plane interlacing (RRRRRR...GGGGGG...BBBBBB...) |
PartitionInterlace | Similar to plane interlaing except that the different planes are saved to individual files (e.g. image.R, image.G, and image.B) |
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UndefinedLayer | Unset value. |
RedLayer | Select red layer |
GreenLayer | Select green layer |
BlueLayer | Select blue layer |
MatteLayer | Select matte (opacity values) layer |
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UniformNoise | Uniform noise |
GaussianNoise | Gaussian noise |
MultiplicativeGaussianNoise | Multiplicative Gaussian noise |
ImpulseNoise | Impulse noise |
LaplacianNoise | Laplacian noise |
PoissonNoise | Poisson noise |
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PointMethod | Replace pixel color at point. |
ReplaceMethod | Replace color for all image pixels matching color at point. |
FloodfillMethod | Replace color for pixels surrounding point until encountering pixel that fails to match color at point. |
FillToBorderMethod | Replace color for pixels surrounding point until encountering pixels matching border color. |
ResetMethod | Replace colors for all pixels in image with pen color. |
From the specification: "Rendering intent specifies the style of reproduction
to be used during the evaluation of this profile in a sequence of profiles.
It applies specifically to that profile in the sequence and not to the
entire sequence. Typically, the user or application will set the rendering
intent dynamically at runtime or embedding time."
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UndefinedIntent | Unset value. |
SaturationIntent | A rendering intent that specifies the saturation of the pixels in the image is preserved perhaps at the expense of accuracy in hue and lightness. |
PerceptualIntent | A rendering intent that specifies the full gamut of the image is compressed or expanded to fill the gamut of the destination device. Gray balance is preserved but colorimetric accuracy might not be preserved. |
AbsoluteIntent | Absolute colorimetric |
RelativeIntent | Relative colorimetric |
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UndefinedResolution | Unset value. |
PixelsPerInchResolution | Density specifications are specified in units of pixels per inch (english units). |
PixelsPerCentimeterResolution | Density specifications are specified in units of pixels per centimeter (metric units). |