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Chapters: 1: Introduction 2: Simple example 3: Invocation 4: Finer Control 5: X-Y Plots 6: Contour Plots 7: Image Plots 8: Examples 9: Gri Commands 10: Programming 11: Environment 12: Emacs Mode 13: History 14: Installation 15: Gri Bugs 16: Test Suite 17: Gri in Press 18: Acknowledgments 19: License Indices: Concepts Commands Variables |
9.3.24: `
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`mask the image [to {uservalue .u.}|{imagevalue .i.}]'
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Examine both the image and the mask pixel by pixel. For any pixels
which have a mask value of 1 (which indicates an invalid region of the
image), change the image value. If no `to' phrase is present,
change the image value to 0 in pixel units. If the
`to uservalue .u.' phrase is present, change the pixel to hold the
imagevalue that
corresponds to this uservalue (see `set image range' command for
a discussion of this correspondance). If the `to imagevalue .i.'
phrase is present,
change the pixel to hold that imagevalue (in range 0 to 255 inclusive
for 8-bit images).
