ImageValuePositions [image,val]
returns a list of pixel positions in image that exactly match the value val.
ImageValuePositions [image,val,d]
returns all pixel positions that have values within a distance d from val.
ImageValuePositions
ImageValuePositions [image,val]
returns a list of pixel positions in image that exactly match the value val.
ImageValuePositions [image,val,d]
returns all pixel positions that have values within a distance d from val.
Details
- ImageValuePositions finds and returns pixels of specific values in 2D and 3D images and is typically used for locating features or removing artifacts.
- ImageValuePositions assumes the standard image coordinate system.
- ImageValuePositions always returns coordinates representing the centers of the pixels. Position represents the center of the pixel at the bottom-left corner.
- The pixel value val can be in one of the following forms:
-
s a scalarcolor a color{s1,s2,…} a list of channel values"Max" pixels with maximum intensity"Min" pixels with minimum intensity
- Use PixelValuePositions to get integer indices for the pixel positions. ImageValuePositions [image,val] is equivalent to PixelValuePositions [image,val]-0.5.
Examples
open all close allBasic Examples (2)
Extract positions of the white pixels:
Extract positions of pixels with values within the specified distance from white:
Scope (9)
Data (3)
Position of a value in a grayscale image:
Position of a value in a color image:
Position of a value in a grayscale 3D image:
Value (6)
Position of a pixel with value equal to 0:
Position of the white pixel:
Position of the red pixel:
Positions of the pixels with maximum intensity:
Positions of the pixels with minimum intensity:
Positions of the pixels with values within the specified distance from red:
Properties & Relations (2)
ImageValuePositions [image,val] is equivalent to ImageValuePositions [image,val,0].
ImageValuePositions [image,val] is equivalent to PixelValuePositions [image,val] minus :
Related Guides
History
Text
Wolfram Research (2012), ImageValuePositions, Wolfram Language function, https://reference.wolfram.com/language/ref/ImageValuePositions.html.
CMS
Wolfram Language. 2012. "ImageValuePositions." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/ImageValuePositions.html.
APA
Wolfram Language. (2012). ImageValuePositions. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ImageValuePositions.html
BibTeX
@misc{reference.wolfram_2025_imagevaluepositions, author="Wolfram Research", title="{ImageValuePositions}", year="2012", howpublished="\url{https://reference.wolfram.com/language/ref/ImageValuePositions.html}", note=[Accessed: 17-November-2025]}
BibLaTeX
@online{reference.wolfram_2025_imagevaluepositions, organization={Wolfram Research}, title={ImageValuePositions}, year={2012}, url={https://reference.wolfram.com/language/ref/ImageValuePositions.html}, note=[Accessed: 17-November-2025]}