BUILT-IN MATHEMATICA SYMBOL
Image
Image[data]
represents a raster image with pixel values given by the array data.
Image[graphics]
creates a raster image from a graphics object.
Image[obj, options]
gives an image that uses the specified options.
- Image[...] displays in a notebook as an image.
- Image[data] arranges successive rows of data down the page, and successive columns across.
- In Image[data], each element of data can specify values for any number of channels.
- By default, elements of data are displayed as follows:
-
| v | gray level from 0 (black) to 1 (white) |
| {r,g,b} | red, green, blue values from 0 to 1 |
| {c1,c2,c3,...} | channel values represented by equally spaced hues |
- Image[data] by default allows values of any size, but displays only values between 0 and 1.
- Image[data, "type"] takes values of the following types:
-
| "Bit" | integer 0 or 1 |
| "Byte" | integer 0 through 255 |
| "Bit16" | integer 0 through 65535 |
| "Real32" | single precision real (32-bit) |
| "Real" | double precision real (64-bit) |
- Image[data] is equivalent to Image[data, "Real"].
- Image[data, "type"] coerces values in data to the specified type by rounding or clipping.
- Image[image, "type"] can be used to convert between types.
- Image takes the following options:
-
- ColorSpace->"space" specifies that values in the data should be interpreted as coordinates in a particular color space. ColorSpace->Automatic treats values as arbitrary channel intensities.
- Bit images always have ColorSpace set to Automatic.
- With the setting ColorSpace->"RGB", data given as
is taken to include an opacity value a.
- With the default setting Interleaving->True, Image[data, ...] takes data to be a 2D array of lists
of channel values.
- With Interleaving->False, Image[data, ...] takes data to be a list
of 2D arrays of values for each channel.
- Explicit settings for ImageSize determine the absolute size at which images should be displayed.
- With ImageSize->Automatic, the size at which images should be displayed is determined by the setting for Magnification.
- A setting Magnification->m specifies that each pixel in Image[...] should be displayed as an m×m block of pixels.
- With Magnification->Automatic, smaller images are typically displayed at larger magnifications, and large images are reduced to fit within available notebook or other display areas.
- Image[graphics] effectively uses Rasterize[graphics, "Image"] to rasterize graphics.
- Image[Raster[...]] converts a Raster object to an image.
- Image[Image[...], opts] effectively resets the options for an image.
- ImageDimensions, ImageChannels, and ImageType find information on the structure of an image.
Create an image object from a 3×3 array:
| Out[1]= |  |
Create a real-value image from random numbers in the range 0 to 1:
| Out[1]= |  |
Image with three color channels:
| Out[1]= |  |
Image created from random bytes in the range 0 to 255:
| Out[1]= |  |
Binary image from cellular automaton data:
| Out[1]= |  |
Import an image from a file:
| Out[1]= |  |
Change the image type:
| Out[2]= |  |
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