WOLFRAM

Wolfram Language & System Documentation Center
Wolfram Language Home Page »

ImageResize
✖
ImageResize

✖
ImageResize[image,width]

gives a resized version of image that is width pixels wide.

✖
ImageResize[image,{size}]

gives a resized version of image with a maximum pixel width or height given by size.

✖
ImageResize[image,{width,height}]

gives a resized version of image that has exactly the specified pixel width and height.

✖
ImageResize[video,…]

gives a video in which every frame is resized.

✖
ImageResize[image,{width,depth,height}]

gives a resized version of a 3D image with the specified dimensions.

Details and Options

  • Image resizing changes the pixel dimensions of an image. This is needed when enlarging an image for viewing purposes or creating thumbnails when previewing a collection of images. It is also used to conform collections of images into a common size when batch processing, training, etc.
  • ImageResize[image,w] and ImageResize[image,{s}] preserve the original aspect ratio of image.
  • Specifications for width, height and depth can be any of the following:
  • dd pixels
    {d}maximum d pixels
    Scaled[s]a multiple s of the original size
    Allpreserve the original dimension
    Automaticdetermine value from aspect ratio
    Tiny,Small,Medium,Largepredefined absolute sizes
  • ImageResize[image,w] is equivalent to ImageResize[image,{w,Automatic}].
  • ImageResize[image,{size}] is equivalent to ImageResize[image,{{size},{size}}].
  • To obtain an image with an aspect ratio r, use ImageResize[image,w{1,r}].
  • The following options can be given:
  • Padding "Reversed"padding method
    Resampling Automaticresampling method

Examples

open allclose all

Basic Examples  (1)Summary of the most common use cases

Resize an image to be 100 pixels wide:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-1dcwws
Out[1]=1

Scope  (5)Survey of the scope of standard use cases

Data  (3)

Resize a grayscale image:

In[3]:=3
✖
https://wolfram.com/xid/09bu4nkda-o8nj8r
Out[3]=3

Resize frames of a video:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-zvje5z
Out[1]=1

Resize a 3D image:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-o2f3a8
Out[1]=1

Parameters  (2)

Specify the width of the resulting image:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-52kli1
Out[2]=2

Resize by a factor of :

In[6]:=6
✖
https://wolfram.com/xid/09bu4nkda-ut7qm2
Out[6]=6

Use Automatic to explicitly preserve the aspect ratio of the image:

In[7]:=7
✖
https://wolfram.com/xid/09bu4nkda-9e0erw
Out[7]=7

Resize an image to have the larger dimension no greater than 200 pixels:

In[12]:=12
✖
https://wolfram.com/xid/09bu4nkda-ux19w0
Out[12]=12

Specify both width and height dimensions:

In[10]:=10
✖
https://wolfram.com/xid/09bu4nkda-7zmetk
Out[10]=10

Resize in one dimension only:

In[8]:=8
✖
https://wolfram.com/xid/09bu4nkda-1zt3to
Out[8]=8

Specify a named size:

In[11]:=11
✖
https://wolfram.com/xid/09bu4nkda-q7qwtv
Out[11]=11

Resize a 3D image:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-vtgl6l
In[2]:=2
✖
https://wolfram.com/xid/09bu4nkda-mgg2y3
Out[2]=2

Resize given the new width:

In[3]:=3
✖
https://wolfram.com/xid/09bu4nkda-tax7d6
Out[3]=3
In[4]:=4
✖
https://wolfram.com/xid/09bu4nkda-fwj9po
Out[4]=4

Resize given the new height:

In[5]:=5
✖
https://wolfram.com/xid/09bu4nkda-jgf2iy
Out[5]=5
In[6]:=6
✖
https://wolfram.com/xid/09bu4nkda-70nlbd
Out[6]=6

Options  (4)Common values & functionality for each option

Padding  (3)

By default, "Reversed" padding is used:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-gadc3x
Out[1]=1

Use constant padding:

In[5]:=5
✖
https://wolfram.com/xid/09bu4nkda-f1cj4r
Out[5]=5

When resampling method is set to "Nearest", all padding methods return the same result:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-p4qnli
Out[1]=1

With constant padding, the padding value is converted to the color space of the target image:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-fkt2nl
Out[1]=1

Resampling  (1)

By default, "Lanczos" resampling method is used when resizing an image:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-bi2szl
Out[1]=1

Use method "Nearest":

In[13]:=13
✖
https://wolfram.com/xid/09bu4nkda-mlevoe
Out[13]=13

Applications  (3)Sample problems that can be solved with this function

Create an image thumbnail:

✖
https://wolfram.com/xid/09bu4nkda-tjpimi
Out[2]=2

Conform and classify a list of day and night images.

Here is an example set containing labeled images of day and night:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-ephwzg

Calculate the average dimension of the example images:

In[2]:=2
✖
https://wolfram.com/xid/09bu4nkda-gov82e
Out[2]=2
In[3]:=3
✖
https://wolfram.com/xid/09bu4nkda-i8n3du
Out[3]=3

Create the classifier:

In[4]:=4
✖
https://wolfram.com/xid/09bu4nkda-g2chok
Out[4]=4

Try this classifier on a few test images:

In[5]:=5
✖
https://wolfram.com/xid/09bu4nkda-jrle11
Out[5]=5

Get a list of images from the web and then conform them:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-d3vg1i
Out[1]=1

Conform dimensions of the list of images:

In[2]:=2
✖
https://wolfram.com/xid/09bu4nkda-b5m0fa
Out[2]=2

Conform while imposing an aspect ratio that averages over the images:

In[3]:=3
✖
https://wolfram.com/xid/09bu4nkda-ijj3bs
Out[3]=3

Properties & Relations  (4)Properties of the function, and connections to other functions

Resampling method "Nearest" is used when increasing the size of an image with only a few pixels:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-b1cjb2
Out[1]=1
In[2]:=2
✖
https://wolfram.com/xid/09bu4nkda-fhhrmt
Out[2]=2

Use "Linear" resampling:

In[3]:=3
✖
https://wolfram.com/xid/09bu4nkda-iybnmd
Out[3]=3

Use ImageResize instead of Size argument in ImageTransformation:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-duscus
Out[1]=1

Thumbnail is equivalent to ImageResize using size specification Small and "Fixed" padding:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-uach1
Out[1]=1

Importing an image with given ImageSize is equivalent to resizing after Import:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-zkjcxx
Out[1]=1

Possible Issues  (2)Common pitfalls and unexpected behavior

Downsizing with no interpolation will give poor results for thin objects:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-xh68t
Out[2]=2

Use first-order interpolation:

In[3]:=3
✖
https://wolfram.com/xid/09bu4nkda-hpy7eo
Out[3]=3

Reducing the size of an image with high-frequency content may result in a moire pattern:

In[1]:=1
✖
https://wolfram.com/xid/09bu4nkda-bg21ta
In[2]:=2
✖
https://wolfram.com/xid/09bu4nkda-cufw88
Out[2]=2

Blur the image to reduce the moire effect:

In[3]:=3
✖
https://wolfram.com/xid/09bu4nkda-ehlxdi
Out[3]=3

Interactive Examples  (1)Examples with interactive outputs

Create a pan and zoom application while fixing the displayed image size:

In[25]:=25
✖
https://wolfram.com/xid/09bu4nkda-q8hfy
Out[25]=25
Wolfram Research (2008), ImageResize, Wolfram Language function, https://reference.wolfram.com/language/ref/ImageResize.html (updated 2021).
✖
Wolfram Research (2008), ImageResize, Wolfram Language function, https://reference.wolfram.com/language/ref/ImageResize.html (updated 2021).

Text

Wolfram Research (2008), ImageResize, Wolfram Language function, https://reference.wolfram.com/language/ref/ImageResize.html (updated 2021).

✖
Wolfram Research (2008), ImageResize, Wolfram Language function, https://reference.wolfram.com/language/ref/ImageResize.html (updated 2021).

CMS

Wolfram Language. 2008. "ImageResize." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2021. https://reference.wolfram.com/language/ref/ImageResize.html.

✖
Wolfram Language. 2008. "ImageResize." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2021. https://reference.wolfram.com/language/ref/ImageResize.html.

APA

Wolfram Language. (2008). ImageResize. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ImageResize.html

✖
Wolfram Language. (2008). ImageResize. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ImageResize.html

BibTeX

@misc{reference.wolfram_2025_imageresize, author="Wolfram Research", title="{ImageResize}", year="2021", howpublished="\url{https://reference.wolfram.com/language/ref/ImageResize.html}", note=[Accessed: 02-April-2025 ]}

✖
@misc{reference.wolfram_2025_imageresize, author="Wolfram Research", title="{ImageResize}", year="2021", howpublished="\url{https://reference.wolfram.com/language/ref/ImageResize.html}", note=[Accessed: 02-April-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_imageresize, organization={Wolfram Research}, title={ImageResize}, year={2021}, url={https://reference.wolfram.com/language/ref/ImageResize.html}, note=[Accessed: 02-April-2025 ]}

✖
@online{reference.wolfram_2025_imageresize, organization={Wolfram Research}, title={ImageResize}, year={2021}, url={https://reference.wolfram.com/language/ref/ImageResize.html}, note=[Accessed: 02-April-2025 ]}