Combine Buffers Using Formula
Combine Buffers Using Formula
This option is used to combine the intensities of two or more buffers,
pixel-by-pixel, using a user-specified formula. The result is written out
to a further buffer (which may be the same as one of the source buffers).
Combine 2, 3 or 4 buffers ?
Two, three or four buffers may be combined to give the resulting image.
This entry specifies how many buffers will be used.
Use which buffer to give the "P" intensities ?
The pixel intensities in buffer specified here will be used as the P value
in the formula (see below).
Use which buffer to give the "Q" intensities ?
The pixel intensities in buffer specified here will be used as the Q value
in the formula (see below).
Use which buffer to give the "R" intensities ?
The pixel intensities in buffer specified here will be used as the R value
in the formula (see below).
Use which buffer to give the "R" intensities ?
The pixel intensities in buffer specified here will be used as the R value
in the formula (see below).
Use which buffer to give the "S" intensities ?
The pixel intensities in buffer specified here will be used as the S value
in the formula (see below).
Combine intensities in Window or whole Screen ?
The formula applied to the intensities in the two buffers may be confined
to a window (<W>) or contain the entire image (<S>).
Window Selection: Region intensities in
If the answer to the previous question specified that the intensities
were to be combined from the contents of a window in the two buffers, then
the window selection submenu is produced to enable the window to be
specified. Information on operation of DigImage windows may be found
under the [H Help] option within the submenu.
Formula combining the P and Q intensities ?
The formula to be used to combine the intensities of the two buffers
should be given at this prompt. The normal DigImage expression syntax
apply (consult System Overview or <shift><f1> for further details). The
letter P is used to represent the intensity at a pixel in the first
buffer and Q the intensity at the corresponding pixel in the second
buffer.
Formula combining the P, Q and R intensities ?
The formula to be used to combine the intensities of the three buffers
should be given at this prompt. The normal DigImage expression syntax
apply (consult System Overview or <shift><f1> for further details). The
letter P is used to represent the intensity at a pixel in the first
buffer, Q the intensity at the corresponding pixel in the second buffer
and R the third buffer.
Formula combining the P, Q, R and S intensities ?
The formula to be used to combine the intensities of the three buffers
should be given at this prompt. The normal DigImage expression syntax
apply (consult System Overview or <shift><f1> for further details). The
letter P is used to represent the intensity at a pixel in the first
buffer, Q the intensity at the corresponding pixel in the second buffer,
R the third buffer and S the fourth buffer.
If result less than 0 or more than 255, then Saturate or Wrap ?
If the result of the above expression is negative or exceeds the maximum
intensity of 255, then the result may either be saturated (<S>; to zero or
255 as appropriate), or wrapped (<W>).
Place resulting image where ?
The image resulting from combining the intensities will be placed in the
buffer specified at this prompt. Any DigImage buffer may be used
(including one of the source buffers). The selected buffer is made the
current output buffer. The buffer is NOT cleared prior to the calculation,
meaning that if a window is used, regions outside the window will be
preserved.
Message:
Combining intensities...
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DigImage User Documentation
Stuart Dalziel,
last page update: 19 February 1996