[Image Info] menu
You can view the contents of the FITS image header.
NoticeThe information in the FITS header will be lost if you save the image in any format that besides FITS.
A FITS image needs a FITS Header.
If you open a non-FITS image, Makali`i will store equivalent information in a temporary Header. If you save that non-FITS image in a FITS format, the contents of the temporary header will be saved as the FITS Header.
[Print...]This command prints the content of the FITS header.
[Setup of a Dispersion axes parameter...]You can set the physical parameters of the distribution axis that is used when drawing a [Graph] by designating a line segment or a rectangle on an image.
The x axis and the y axis of an fits image data is not necessarily a space scale. For example, one of the axis of a spectrum image might have information about wavelength. You can choose one of these physical values, such as wavelength, frequency, velocity, and wave numbers,
By setting the physical parameter, you can for example draw a graph with wavelength used as the vertical axis.
If a FITS image file already has information for the dispersion axis, the information in the header will be shown as the initial value of the dialog.
When an image is saved after you have changed these values, a dialog asking whether the changed values should be saved in the FITS Header will be displayed.
The explanation of each value follows:
[Setup of a Dispersion axes parameter...]
[Select Dispersion Axis]Choose which direction to use as the dispersion axis (the horizontal axis) when specifying the drawing region by a rectangle. This value is not used when specifying the drawing region by a line-segment.
[Type]If a physical quantity is not specified the dispersion axis is displayed in pixels. When you want the dispersion axis to display a physical quantity, you must specify the type of physical quantity.
[Unit]Specify the physical quantity unit to be used on the dispersion axis.
[Reference Point (X, Y)]Specify the reference point used to match the pixels with physical quantity.
[Physical quantity for the point]Specify the physical quantity for the [Reference Point (X, Y)].
[Increment of physical quantity per Pixel]Specify how much the physical quantity changes per pixel in the direction of the dispersion axis.
[Matrix of Linear Transformation]Specify these values to generate a rotated rectangle or a parallelogram (or other shapes) as a drawing area of a graph.
Example: When you want to specify a rectangle rotated 30 degrees counterclockwise as the drawing area, enter the following values.
0.8660 -0.5000 0.5000 0.8660
The drawing area results from the specified rectangle multiplied by a 2x2 matrix. (in other words, the rectangle is linear transformed).