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diff --git a/man/man1/funimage.1 b/man/man1/funimage.1 new file mode 100644 index 0000000..ea9db5a --- /dev/null +++ b/man/man1/funimage.1 @@ -0,0 +1,428 @@ +.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32 +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. | will give a +.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used to +.\" do unbreakable dashes and therefore won't be available. \*(C` and \*(C' +.\" expand to `' in nroff, nothing in troff, for use with C<>. +.tr \(*W-|\(bv\*(Tr +.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' +.ie n \{\ +. ds -- \(*W- +. ds PI pi +. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch +. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch +. ds L" "" +. ds R" "" +. ds C` "" +. ds C' "" +'br\} +.el\{\ +. ds -- \|\(em\| +. ds PI \(*p +. ds L" `` +. ds R" '' +'br\} +.\" +.\" If the F register is turned on, we'll generate index entries on stderr for +.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index +.\" entries marked with X<> in POD. Of course, you'll have to process the +.\" output yourself in some meaningful fashion. +.if \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.\" +.\" For nroff, turn off justification. 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If \*(L"stdin\*(R" is specified, data are +read from the standard input. Use Funtools +Bracket Notation to specify \s-1FITS\s0 extensions, image sections, and +filters. The second argument is the output \s-1FITS\s0 file. If \*(L"stdout\*(R" is +specified, the \s-1FITS\s0 image is written to the standard output. By +default, the output pixel values are of the same data type as those of the +input file (or type \*(L"int\*(R" when binning a table), but this can be +overridden using an optional third argument of the form: +.PP +.Vb 1 +\& bitpix=n +.Ve +.PP +where n is 8,16,32,\-32,\-64, for unsigned char, short, int, float and double, +respectively. +.PP +If the input data are of type image, the appropriate section is +extracted and blocked (based on how the +Image Section is specified), and +the result is written to the \s-1FITS\s0 primary image. When an integer +image containing the \s-1BSCALE\s0 and \s-1BZERO\s0 keywords is converted to float, +the pixel values are scaled and the scaling keywords are deleted from the +output header. When converting integer scaled data to integer +(possibly of a different size), the pixels are not scaled and the +scaling keywords are retained. +.PP +If the input data is a binary table or raw event file, these are +binned into an image, from which a section is extracted and blocked, +and written to a primary \s-1FITS\s0 image. In this case, it is necessary to +specify the two columns that will be used in the 2D binning. This can +be done on the command line using the \fBbincols=(x,y)\fR keyword: +.PP +.Vb 1 +\& funcnts "foo.ev[EVENTS,bincols=(detx,dety)]" +.Ve +.PP +The full form of the \fBbincols=\fR specifier is: +.PP +.Vb 1 +\& bincols=([xname[:tlmin[:tlmax:[binsiz]]]],[yname[:tlmin[:tlmax[:binsiz]]]]) +.Ve +.PP +where the tlmin, tlmax, and binsiz specifiers determine the image binning +dimensions: +.PP +.Vb 2 +\& dim = (tlmax - tlmin)/binsiz (floating point data) +\& dim = (tlmax - tlmin)/binsiz + 1 (integer data) +.Ve +.PP +Using this syntax, it is possible to bin any two columns of a binary +table at any bin size. Note that the tlmin, tlmax, and binsiz +specifiers can be omitted if \s-1TLMIN\s0, \s-1TLMAX\s0, and \s-1TDBIN\s0 header parameters +(respectively) are present in the \s-1FITS\s0 binary table header for the +column in question. Note also that if only one parameter is specified, +it is assumed to be tlmax, and tlmin defaults to 1. If two parameters +are specified, they are assumed to be tlmin and tlmax. +See Binning \s-1FITS\s0 Binary Tables and Non-FITS +Event Files for more information about binning parameters. +.PP +By default, a new 2D \s-1FITS\s0 image file is created and the image is written +to the primary \s-1HDU\s0. If the \fB\-a\fR (append) switch is specified, +the image is appended to an existing \s-1FITS\s0 file as an \s-1IMAGE\s0 extension. +(If the output file does not exist, the switch is effectively ignored +and the image is written to the primary \s-1HDU\s0.) This can be useful in a +shell programming environment when processing multiple \s-1FITS\s0 images +that you want to combine into a single final \s-1FITS\s0 file. +.PP +\&\fBfunimage\fR also can take input from a table containing columns of +x, y, and value (e.g., the output from \fBfundisp \-l\fR which +displays each image x and y and the number of counts at that +position.) When the \fB\-l\fR (list) switch is used, the input file is +taken to be a \s-1FITS\s0 or \s-1ASCII\s0 table containing (at least) three columns +that specify the x and y image coordinates and the value of that +image pixel. In this case, \fBfunimage\fR requires four extra +arguments: xcolumn:xdims, ycolumn:ydims, vcolumn and bitpix=n. The x +and y col:dim information takes the form: +.PP +.Vb 3 +\& name:dim # values range from 1 to dim +\& name:min:max # values range from min to max +\& name:min:max:binsiz # dimensions scaled by binsize +.Ve +.PP +In particular, the min value should be used whenever the +minimum coordinate value is something other than one. For example: +.PP +.Vb 1 +\& funimage \-l foo.lst foo.fits xcol:0:512 ycol:0:512 value bitpix=-32 +.Ve +.PP +The list feature also can be used to read unnamed columns from standard +input: simply replace the column name with a null string. Note +that the dimension information is still required: +.PP +.Vb 5 +\& funimage \-l stdin foo.fits "":0:512 "":0:512 "" bitpix=-32 +\& 240 250 1 +\& 255 256 2 +\& ... +\& ^D +.Ve +.PP +The list feature provides a simple way to generate a blank image. +If you pass a Column-based Text File +to funimage in which the text header contains the required image +information, then funimage will correctly make a blank image. For +example, consider the following text file (called foo.txt): +.PP +.Vb 3 +\& x:I:1:10 y:I:1:10 +\& ------ ------ +\& 0 0 +.Ve +.PP +This text file defines two columns, x and y, each of data type 32-bit int and +image dimension 10. The command: +.PP +.Vb 1 +\& funimage foo.txt foo.fits bitpix=8 +.Ve +.PP +will create an empty \s-1FITS\s0 image called foo.fits containing a 10x10 +image of unsigned char: +.PP +.Vb 13 +\& fundisp foo.fits +\& 1 2 3 4 5 6 7 8 9 10 +\& ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ +\& 10: 0 0 0 0 0 0 0 0 0 0 +\& 9: 0 0 0 0 0 0 0 0 0 0 +\& 8: 0 0 0 0 0 0 0 0 0 0 +\& 7: 0 0 0 0 0 0 0 0 0 0 +\& 6: 0 0 0 0 0 0 0 0 0 0 +\& 5: 0 0 0 0 0 0 0 0 0 0 +\& 4: 0 0 0 0 0 0 0 0 0 0 +\& 3: 0 0 0 0 0 0 0 0 0 0 +\& 2: 0 0 0 0 0 0 0 0 0 0 +\& 1: 1 0 0 0 0 0 0 0 0 0 +.Ve +.PP +Note that the text file must contain at least +one row of data. However, in the present example, event position 0,0 is +outside the limits of the image and will be ignored. (You can, of course, +use real x,y values to seed the image with data.) +.PP +Furthermore, you can use the \s-1TEXT\s0 filter specification to obviate the need for +an input text file altogether. The following command will create the same +10x10 char image without an actual input file: +.PP +.Vb 3 +\& funimage stdin'[TEXT(x:I:10,y:I:10)]' foo.fits bitpix=8 < /dev/null +\&or +\& funimage /dev/null'[TEXT(x:I:10,y:I:10)]' foo.fits bitpix=8 +.Ve +.PP +You also can use either of these methods to generate a region mask simply +by appending a region inside the filter brackets and specfying \fBmask=all\fR +along with the bitpix. For example, the following command will generate a +10x10 char mask using 3 regions: +.PP +.Vb 2 +\& funimage stdin'[TEXT(x:I:10,y:I:10),cir(5,5,4),point(10,1),-cir(5,5,2)]' \e +\& foo.fits bitpix=8,mask=all < /dev/null +.Ve +.PP +The resulting mask looks like this: +.PP +.Vb 13 +\& fundisp foo.fits +\& 1 2 3 4 5 6 7 8 9 10 +\& ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ +\& 10: 0 0 0 0 0 0 0 0 0 0 +\& 9: 0 0 0 0 0 0 0 0 0 0 +\& 8: 0 0 1 1 1 1 1 0 0 0 +\& 7: 0 1 1 1 1 1 1 1 0 0 +\& 6: 0 1 1 0 0 0 1 1 0 0 +\& 5: 0 1 1 0 0 0 1 1 0 0 +\& 4: 0 1 1 0 0 0 1 1 0 0 +\& 3: 0 1 1 1 1 1 1 1 0 0 +\& 2: 0 0 1 1 1 1 1 0 0 0 +\& 1: 0 0 0 0 0 0 0 0 0 2 +.Ve +.PP +You can use \fBfunimage\fR to create 1D image projections along the x +or y axis using the \fB\-p [x|y]\fR switch. This capability works for +both images and tables. For example consider a \s-1FITS\s0 table named ev.fits +containing the following rows: +.PP +.Vb 17 +\& X Y +\& -------- -------- +\& 1 1 +\& 1 2 +\& 1 3 +\& 1 4 +\& 1 5 +\& 2 2 +\& 2 3 +\& 2 4 +\& 2 5 +\& 3 3 +\& 3 4 +\& 3 5 +\& 4 4 +\& 4 5 +\& 5 5 +.Ve +.PP +A corresponding 5x5 image, called dim2.fits, would therefore contain: +.PP +.Vb 7 +\& 1 2 3 4 5 +\& ---------- ---------- ---------- ---------- ---------- +\& 5: 1 1 1 1 1 +\& 4: 1 1 1 1 0 +\& 3: 1 1 1 0 0 +\& 2: 1 1 0 0 0 +\& 1: 1 0 0 0 0 +.Ve +.PP +A projection along the y axis can be performed on either the table or +the image: +.PP +.Vb 4 +\& funimage \-p y ev.fits stdout | fundisp stdin +\& 1 2 3 4 5 +\& ---------- ---------- ---------- ---------- ---------- +\& 1: 1 2 3 4 5 +.Ve +.PP +.Vb 4 +\& funimage \-p y dim2.fits stdout | fundisp stdin +\& 1 2 3 4 5 +\& ---------- ---------- ---------- ---------- ---------- +\& 1: 1 2 3 4 5 +.Ve +.PP +Furthermore, you can create a 1D image projection along any column of +a table by using the \fBbincols=[column]\fR filter specification and +specifying a single column. For example, the following command +projects the same 1D image along the y axis of a table as use of +the \fB\-p y\fR switch: +.PP +.Vb 4 +\& funimage ev.fits'[bincols=y]' stdout | fundisp stdin +\& 1 2 3 4 5 +\& ---------- ---------- ---------- ---------- ---------- +\& 1: 1 2 3 4 5 +.Ve +.PP +Examples: +.PP +Create a \s-1FITS\s0 image from a \s-1FITS\s0 binary table: +.PP +.Vb 1 +\& [sh] funimage test.ev test.fits +.Ve +.PP +Display the \s-1FITS\s0 image generated from a blocked section of \s-1FITS\s0 binary table: +.PP +.Vb 5 +\& [sh] funimage "test.ev[2:8,3:7,2]" stdout | fundisp stdin +\& 1 2 3 +\& --------- --------- --------- +\& 1: 20 28 36 +\& 2: 28 36 44 +.Ve +.SH "SEE ALSO" +.IX Header "SEE ALSO" +See funtools(7) for a list of Funtools help pages |