ImageTake

ImageTake[image,n]

gives an image consisting of the first n rows of image.

ImageTake[image,-n]

gives an image consisting of the last n rows of image.

ImageTake[image,{row1,row2}]

gives rows row1 through row2.

ImageTake[image,{row1,row2},{col1,col2}]

gives the image that spans row1 to row2 and col1 to col2.

ImageTake[image3d,{slice1,slice2},{row1,row2},{col1,col2}]

gives the 3D image consisting of the specified slices, rows, and columns.

Details

  • ImageTake is typically used for extracting regions of interest by cropping or trimming an image.
  • ImageTake uses the standard sequence specification:
  • Allall elements
    nelements 1 up to n
    UpTo[n]elements 1 up to n
    -nlast n elements
    {n}element n only
    {m,n}elements m through n inclusive
    {m,n,s}elements m through n in steps of s
  • If fewer elements exist than are requested, ImageTake will just return the elements that are present.

Examples

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Basic Examples  (2)

Take the first 70 pixel rows from an image:

Take rows 30 through 100 and columns 60 through 130 from an image:

Scope  (4)

Data  (2)

Take rows 80 to 200 from a grayscale image:

Take the top 23 slices of a 3D image:

Parameters  (2)

Take the last 100 rows from an image:

Take rows 30 to 100:

Take row 100:

Take every other row of the image:

Take the first 100 columns:

Take a range of rows and columns:

Take the bottom 23 slices of a 3D image:

Take a selected horizontal slice of a 3D image:

Take all slices in a selected region of the 3D image:

Take selected part of a 3D volume:

Applications  (2)

Trim an image by removing a 30-pixel-wide border:

Use ImageKeypoints to determine a region of interest:

Highlight the region of interest:

Convert from image coordinates to matrix coordinates and extract the region of interest:

Properties & Relations  (3)

Use ImageTake to obtain the same top-bottom reflection as with ImageReflect:

Downsample an image by extracting every other pixel:

Downsample a 3D image by a factor of 3:

Interactive Examples  (2)

Interactive image panning:

Interactively take specified parts on a volume:

Introduced in 2008
 (7.0)
 |
Updated in 2015
 (10.3)