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BUILT-IN MATHEMATICA SYMBOL
PixelValue[image, {x, y}]
gives the pixel value of image at position 
.
PixelValue[image, {xmin;;xmax, ymin;;ymax}]
gives the values of pixels whose coordinates range from 
to 
.
PixelValue[image, {x, y}, "type"]
gives the pixel value converted to the specified type.
Details and Options
- In PixelValue[image, {x, y}], the values of x range from
to w+0.5, and the values of y range from 
to h+0.5 for an image of width w and height h. - Integer coordinates correspond to the centers of the pixels. Position
represents the center of the pixel at the bottom-left corner. - In 3D, pixel position
corresponds to the center of the bottom-left front pixel. - In PixelValue[image, {xp, yp}], the position
corresponds to the point 
, with 
assumed to be in the standard image coordinate system, where the values of x range from 0 to width and y from 0 to height. Pixel position 
represents the center of the pixel at the bottom-left corner. - PixelValue gives the value of the pixel nearest to
. - PixelValue gives the value of the pixel nearest to
, except that when the position 
lies on a boundary between pixels, the average of the pixels surrounding 
is returned. - Use ImageValue to extract interpolated values at
in the image coordinate where x runs from 0 to width and y runs from 0 to height. Position 
corresponds to the bottom-left corner of the image. - PixelValue[image, {{x1, y1}, ...}] can be used to get pixel values for multiple positions.
- PixelValue[image, {x, y}] by default returns values between 0 and 1. Using PixelValue[image, {x, y}, "type"], pixel value is returned in the range specified by
. See the reference page for Image for a list of all possible data types. - PixelValue[image, {x, y}, Automatic] is equivalent to PixelValue[image, {x, y}, ImageType[image]].
- PixelValue can take a Padding option that is used when a specified position is beyond an image.
New in 8 | Last modified in 9
