mask Documentation

MASK - Pixels outside range MIN and MAX are set to null
PROGRAMMER: EELIASON
This program will accept either one or two input files to create a
single output file.  MASK can handle 8-bit, 16-bit, or 32-bit image
files.

MASK moves values of the first input file to the output file if the
corresponding values in the second input file are within the range
specified by MIN and MAX, else the output file is set to null.
If there is only one input file then the limits of MIN and MAX are
tested in the first input file.

ALGORITHM -
For two input files:
        if MIN <= INPUT2(i,j) <= MAX then
           OUTPUT(i,j) = INPUT1(i,j)
        else
           OUTPUT(i,j) = null

For one input file:
        if MIN <= INPUT1(i,j) <= MAX then
           OUTPUT(i,j) = INPUT1(i,j)
        else
           OUTPUT(i,j) = null

INPUT IMAGE FILE NAMES
(ENTER 1 OR 2 FILES)

NONE

OUTPUT IMAGE FILE NAME

NONE

MINIMUM VALUE FOR VALID DATA

1

MAXIMUM VALUE FOR VALID DATA

255

NULL VALUE, USED ONLY
WHEN BIT TYPE IS 16

0

STARTING LINE

1

STARTING SAMPLE

1

NUMBER OF LINES

0

NUMBER OF SAMPLES

0

LINE INCREMENT

1.

SAMPLE INCREMENT

1.

ADDITIONAL NOTES:

Parm	Description
FROM	Mask accepts one or two input files. If only one input file is provided then the MIN and MAX parameters are compared with the one file. If two input files are specified then the MIN and MAX parameters are compared with the second input file.
MIN	Values in the tested file less than MIN are set to the NULL value.
MAX	Values in the tested file greater than MAX are set to the NULL value.
NULL	The Null parameter is applicable only to 16-bit data. NULL specifies the value to assign an output pixel when the corresponding input pixel is outside the range of MIN and MAX.
NL	Number of lines. The default is 0 which will process all lines of the image.
NS	Number of samples. The default is 0 which will process all samples of the image.
SL	Starting line. The default is 1 which will start the processing with the first line or top of the image.
SS	Starting sample. The default is 1 which will start the processing with the first sample or left side of the image.
LINC	Line increment. The default is 1.0 which will process each line of the image. LINC=2.0 will process every other line and the output image will have half as many lines as the input. LINC=.5 will process each line twice and the output image will have twice as many lines as the input.
SINC	Sample increment. The default is 1.0 which will process each sample of the image. SINC=2.0 will process every other sample and the output image will have half as many samples as the input. SINC=.5 will process each sample twice and the output image will have twice as many samples as the input.