The Close button on the PCT Editing panel closes the PCT Editing. The Cancel button closes the PCT Editing panel, and restores the PCT that was in effect when the PCT Editing panel was first opened.
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The colour bar on the left is a graphical representation of the PCT, with the top representing an input value of zero and the bottom an input value of 255.
The scrollable table on the right is a textual representation of the current PCT. The table consists of four columns and 256 entries. The first column is the input grey level. The second, third, and fourth columns are the red, green, and blue output values for the given input value. Either the scroll bar or the arrow buttons can be used to scroll through the PCT. The textual PCT representation is not directly editable.
It is possible to click in either the scrollable PCT window, or the graphical PCT window in order to select a ``Grey Level'' to modify in the Colour Selection area of the PCT Panel. The selected entry becomes the new Grey Level value to edit. Changes to the previous PCT entry are lost unless they were already applied. It should also be possible to select multiple PCT entries to operate on by dragging over a series of list entries.
It consists of a horizontal colour sampling bar across the top, a current colour chip on the right, a slider and text field for the red, green, and blue components, a current grey level text field, and the Apply and Undo buttons.
The horizontal colour sampling bar is used to conveniently select a new colour value. Clicking within this bar will modify the current red, green, and blue components within the Colour Selection area to match the point clicked on. As usual, the colour change is not made to the current PCT until the Apply button is pressed.
The colour slider bars are used to modify the red, green, and blue colour components of the currently mixed colour. The current component values are shown in the text fields to the right of the slider bars. These fields are also editable.
The colour chip on the right is present to show the presently mixed colour. It is for information purposes only, and clicking on it does nothing.
When the ``Hold Colour'' button is depressed, selecting a new grey value will not cause the currently mixed colour to be changed.
The ``Grey Level'' text field shows the entry in the PCT for which colour selection is being performed. This field is editable; however, each time the current Grey Level is changed, the Colour Selection area is reloaded with the colour of the newly selected ``Grey Level'' (unless the ``Hold Colour'' button is depressed).
The `Apply' button is used to place the currently mixed colour in the Colour Selection area back into the PCT. The ``Current PCT'' is not changed until the `Apply' button is pressed, thereby applying the new colour to the Current PCT and updating the main image window to reflect the new PCT.
The Undo button is used to undo the last change to the ``Current PCT''. It will undo the last ``Apply'' operation, or the last Predefined PCT operation. Also note that the Cancel button will cancel all changes to the PCT since the PCT Editing panel was popped up.