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.help tiimage Jan97 tables
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NAME
tiimage -- Inserts images into rows of a 3-D table.
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USAGE
tiimage input outtable
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DESCRIPTION
This task performs the inverse operation of task tximage: it inserts one or
more images into rows of a 3-D table The input may be a filename template,
including wildcard characters, or the name of a file (preceded by an @ sign)
containing image names. The output is a single 3-D table name.
Each image in the input list is inserted as an array into a single cell at
the specified row in the output table. Any dimensionality information existent
in the input image is lost in the process, that is, the image will be always
inserted as a 1-D array, regardless of its number of axis.
If the output table exists, insertion will be done in place. Alternatively,
the task can create a 3-D table from information taken either from a template
3-D table, or, if this table is not supplied, from the input images themselves.
This task supports a column selector in table names. This selector may be
used to select a single column in the table. If no selector is used, all
columns will be processed. Type 'help selectors' to see a description of
the selector syntax.
If the output table exists, insertion may take place in two ways. If the
output table name contains a column selector that selects a single column
in the table, all input images will be inserted in that column, starting
at the row pointed by task parameter "row".
If "row" is negative or INDEF the task will look for the ORIG_ROW
keyword in the image header and use that keyword value for row number.
The second mode of insertion in an existing table is used if no matching
column selector is found in the output table name. In this case the task
will look for the columnar information written in the input image header by
task tximage, and use that information to place the image in the proper
column. If no columnar information exists in the header, or if the column
name in there does not match any column in the output table, the image is
skipped and the user warned. The "row" parameter processing works the same
way in this second mode.
If the output table does not exist, the task will look for a template table
where to take column information from. If the template exists, the insertion
operation will be performed in an analogous way as above. Notice that the
result may be a single-column table if the template has a valid (matching)
column selector in its name, or a sparse table if not, because only the
actual input images will be stored in an otherwise empty table (the template
data is not copied into the output, only the column descriptors).
If the template is missing, the task will attempt to retrieve columnar
information from the input image headers and build the output table with
enough columns and rows to fit all images in the list. Only images that
have columnar information in their headers can be processed, though. If
no images are found with the proper header keywords, no output takes place.
NOTE: Both the output and template table names must always be supplied
complete, including their extension. Otherwise the task may get confused
on the existence of an already existing table.
The column matching criterion is based on the column name. An error results
when data types in input image and output column do not agree.
If the maximum array size in a target column in the output 3-D table is
larger than the number of pixels in the input image, the array will be filled
up starting from its first element, and the empty elements at the end will
be set to INDEF. If the maximum array size is smaller than the number of
pixels, insertion begins by the first pixel up to the maximum allowable size,
the remaining pixels being ignored.
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PARAMETERS
.ls input [image name list/template]
A list of one or more images to be inserted.
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.ls outtable [table name]
Name of 3-D output table, including extension. No support exists for
"STDOUT" (ASCII output).
.le
.ls (template = "") [table name]
Name of 3-D table to be used as template when creating a new output table.
.le
.ls (row = INDEF) [int]
Row where insertion begins. If set to INDEF or a negative value, the row
number will be looked for in the input image header.
.le
.ls (verbose = yes) [boolean]
Display names as files are processed ?
.le
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EXAMPLES
Insert images into a 3-D table at column named FLUX:
.nf
cl> tiimage flux*.hhh "otable.tab[c:FLUX]"
.fi
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BUGS
The output and template table names must be supplied in full, including
the extension (e.g. ".tab"). If the output table name is not typed in full,
the task will create a new table in place of the existing one, with only
the rows actually inserted. This behavior relates to the way the underlying
"access" routine in IRAF's fio library works.
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REFERENCES
This task was written by I. Busko.
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SEE ALSO
tximage, selectors
.endhelp
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