ImageFileApply

ImageFileApply[f,"inputfile","outputfile"]
applies the function f to the list of channel values for each pixel of the image stored in and stores the result in .

Details and OptionsDetails and Options

  • ImageFileApply can be used to read, process, and write successive blocks of data from a very large image file whose size could exceed available memory.
  • ImageFileApply[f,"inputfile"] stores the result of an image file in the working directory where the output file name is the concatenation of and the result of DateString[].
  • ImageFileApply works with TIFF, JPEG, and PNG files. The created always has the same file format, data type, and dimensions as .
  • ImageFileApply works on images with any number of channels.
  • In ImageFileApply[f,], the function f can 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.
  • The following options can be given:
  • InterleavingTruewhether to supply f lists of channel values
    "ImageList"Allframes to process from a file with multiple images
    "MaxBlockSize"8000000maximal size of image blocks in pixels loaded into the memory
  • For the most efficient file processing, stripes or tiles of the image may be accessed in a specific order.
  • The value of the option may be exceeded if it is smaller than the smallest block supported for the input file.
  • With , the output image only contains the processed frames.

ExamplesExamplesopen allclose all

Basic Examples  (2)Basic Examples  (2)

Out-of-core negation of a JPEG file:

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Import a thumbnail of the result:

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Specify the output file name:

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Introduced in 2012
(9.0)