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tiimage tables


NAME · USAGE · DESCRIPTION · PARAMETERS · EXAMPLES · BUGS · REFERENCES
SEE_ALSO

NAME

tiimage -- Inserts images into rows of a 3-D table.

USAGE

tiimage input outtable

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.

PARAMETERS

input [image name list/template]
A list of one or more images to be inserted.
outtable [table name]
Name of 3-D output table, including extension. No support exists for "STDOUT" (ASCII output).
(template = "") [table name]
Name of 3-D table to be used as template when creating a new output table.
(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.
(verbose = yes) [boolean]
Display names as files are processed ?

EXAMPLES

Insert images into a 3-D table at column named FLUX:

cl> tiimage flux*.hhh "otable.tab[c:FLUX]"

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.

REFERENCES

This task was written by I. Busko.

SEE ALSO

tximage, selectors


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