applies the function f to the list of channel values for each pixel of the image stored in inputfile.
Details and Options
- ImageFileScan can be used to read and process successive pixel data from a very large image file whose size could exceed available memory.
- The channel values supplied to f are normally in the range 0 to 1, regardless of the underlying type used in the Image object.
- ImageFileScan[f,…] discards the results of applying f to the pixels. Unlike ImageFileApply, ImageFileScan does not create a new file and returns Null.
- ImageFileScan is useful in carrying out an operation on individual pixels where the operation has a "side effect", such as making an assignment.
- ImageFileScan works with TIFF, JPEG, and PNG files.
- ImageFileScan works on images with any number of channels.
- The image file inputfile can be given as a string or a File object.
- ImageFileScan traverses the image in a row-wise order from left to right.
- You can use Throw to exit from ImageFileScan. »
- The following options can be given:
Interleaving True whether to supply f lists of channel values Method Automatic method to use
- The following suboptions can be given to Method:
"ImageList" All frames to process from a file with multiple images "MaxBlockSize" 8000000 maximal size of image blocks in pixels loaded into the memory
- The value of the option "MaxBlockSize" may be exceeded if it is smaller than the smallest block supported for the input file.
Examplesopen allclose all
Introduced in 2012
|Updated in 2014