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ImageFileFilter—Wolfram Language Documentation

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• See Also
  • ImageFilter
  • ImageFileApply
  • ImageFileScan
• Related Guides
  • 3D Images
  • Image Processing & Analysis

ImageFileFilter[f,inputfile,r,outputfile]

applies the function f to the range r neighborhood of each pixel in each channel of the image stored in inputfile and stores the result in outputfile.

• ImageFileFilter can be used to read, process, and write successive blocks of data from a very large image file whose size could exceed available memory.
• ImageFileFilter[f,inputfile,r] stores the result under the "Image" directory in $WolframDocumentsDirectory.
• ImageFileFilter works with TIFF, JPEG, and PNG files. The created outputfile always has the same file format, data type, and dimensions as the inputfile.
• ImageFileFilter works on images with any number of channels.
• The image files inputfile and outputfile can be given as a string or a File object.
• ImageFileFilter[f,inputfile,r] replaces the value of each pixel by the result of applying the function f to the × array of values around that pixel.
• ImageFileFilter[f,"inputfile",{r_row,r_col}] uses range r_row in the row direction, and r_col in the column direction.
• The function f should always return a number or a list of any length.
• The channel values supplied to f are normally in the range 0 to 1, regardless of the underlying type used in the Image object. The function f is assumed to return channel values that are normally in the range 0 to 1.
• ImageFileFilter operates separately on each channel in an image.
• The following options can be given:
• The following suboptions can be given to Method:
• "ImageList" All frames to process from a multi-frame file "MaxBlockSize" 8000000 maximal size of image blocks in pixels loaded into the memory
• With the default setting Interleaving->False, the elements in the arrays to which f is applied are individual channel values for the pixels.
• For the most efficient file processing, stripes or tiles of the image may be accessed in a specific order.
• The value of the option "MaxBlockSize" may be exceeded if it is smaller than the smallest block supported for the input file.
• With "ImageList"->{l₁,l₂,…}, the output image only contains the processed frames.
• Padding->None is not supported by ImageFileFilter.

Out-of-core processing of an image:

Thumbnail of the resulting image:

Specify the output file name:

Compute the average over all channels using Interleaving->True:

Thumbnail of the resulting image:

Apply the function only to one frame of a multi-image file using "ImageList":

Apply the function to a list of frames:

Out-of-core correlation with a Gaussian kernel:

Thumbnail the resulting image:

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