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See Also
- Image
- Image3D
- ImageValue
- PixelValue
- ReplacePixelValue
- ImageDimensions
- ImageChannels
- ImageType
- ImageQ
- Transpose
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- Interpreter Types
- Image
- Related Guides
- Tech Notes
ImageData
Details and Options
- ImageData [image] by default gives a 2D or 3D array whose elements are lists of values for each channel. For a single-channel image, only a value and not a list of values is returned.
- In 2D, the array generated by ImageData [image] is arranged in the same way that the image is displayed, with the first row corresponding to the top row of pixels in the image.
- In 3D, the array generated by ImageData [image] is arranged such that the first part corresponds to the top slice, with rows running from back to front, and columns running from left to right.
- For binary images, ImageData [image] returns integer values 0 or 1. For images of type "Byte" or "Bit16", ImageData [image] always normalizes values to lie between 0 and 1. For images of a real type, ImageData [image] returns whatever real values are used in the image.
- Possible types specified by ImageData [image,"type"] are:
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"Bit" integer 0 or 1"Byte" integer 0 through 255"Bit16" integer 0 through 65535"Real32" single-precision real (32-bit)"Real64" double-precision real (64-bit)
- ImageData [image,Automatic ] is equivalent to ImageData [image,ImageType [image]].
- ImageData has the option Interleaving .
- With the default setting Interleaving->True , ImageData returns a 2D or 3D array of lists of channel values.
- With Interleaving->False , ImageData returns a list of 2D or 3D arrays of values for each channel.
- Interleaving->Automatic returns in the native form used to store the image.
- ImageData accepts a DataReversed option. With DataReversed->True , the order of the rows is reversed.
Examples
open all close allBasic Examples (3)
Channel data for the first five pixels of the first row:
Construct a byte-valued image:
Extract normalized raster data:
Extract raw bytes:
Extract data from a 3D image:
Options (3)
DataReversed (1)
By default, data is returned from the top to the bottom:
Reverse the order of rows:
Interleaving (2)
Data of multichannel images is by default returned in interleaved form:
This gives the pixel data in planar form:
Retrieve the image data in interleaved form:
Retrieve the image data in planar form:
See Also
Image Image3D ImageValue PixelValue ReplacePixelValue ImageDimensions ImageChannels ImageType ImageQ Transpose
Interpreter Types: Image
Function Repository: ExtractPlotImageData
Tech Notes
Text
Wolfram Research (2008), ImageData, Wolfram Language function, https://reference.wolfram.com/language/ref/ImageData.html (updated 2012).
CMS
Wolfram Language. 2008. "ImageData." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2012. https://reference.wolfram.com/language/ref/ImageData.html.
APA
Wolfram Language. (2008). ImageData. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ImageData.html
BibTeX
@misc{reference.wolfram_2025_imagedata, author="Wolfram Research", title="{ImageData}", year="2012", howpublished="\url{https://reference.wolfram.com/language/ref/ImageData.html}", note=[Accessed: 17-November-2025]}
BibLaTeX
@online{reference.wolfram_2025_imagedata, organization={Wolfram Research}, title={ImageData}, year={2012}, url={https://reference.wolfram.com/language/ref/ImageData.html}, note=[Accessed: 17-November-2025]}