Modifying a Color Palette

The editing operations allow the color palette to be calculated automatically or modified based on the user-defined colours.
Manage the colours in the image using the Color Classifier dialog of the Image menu. The following operations are available:
• Reducing the palette by deleting the selected colour or colours or by merging several colours into one;
• Converting to specified color space;
• Changing selected colours;
• Adding new colour(s) to the palette;
• Saving the palette for further use when processing a set of similar colour images.
• Using pseudo halftoning procedure by request;

To edit a palette

Choose Image Classifier from the Image menu.

The buttons and controls in the Image Classifier dialog

Colour samples table	This table contains colour samples of the current palette.
	To specify output image color space.
Colour counter	This control is used to show the number of colours in the current palette (from 2 to 256).
Set auto palette	Pressing this button forces the program to automatically determine a set of colours that represents the image most closely.
Reset palette	This button is used to recalculate the palette based on the number of colours set in the Colour Counter.
	Turn ON the Dithering checkbox to use halftoning feature
	Specify the Dithering method.
	Specify the Propagation (Intensivity) of usage.
View Selection	When this checkbox is checked, the points of selected colours are highlighted with a specified colour in the image.
Choose colour from the image	This tool is used to choose a colour by clicking on a pixel in the document window. The colour of a selected pixel will be highlighted in the Colour samples table.
Select colours from the image	This tool is used to select colours by drawing a polygon around an area in the document window. Press ENTER or right-click to close the polygon.
Choose colour from dialog	Opens the Colour Selection dialog which allows the replacement of the currently selected colour with a new one.
Merge colours	Merges colours selected from the colour samples table to the mean colour.
Delete colours	Deletes colours selected in the colour samples table from the palette
Load LUT	Loads the current palette from a LUT-file (Look-Up Table).
Save LUT	Saves the current palette in a LUT-file (Look-Up Table).
	Use this button to save and load colour palette information to and from a template file.

To calculate a palette automatically

Press the button .
The palette will be recalculated automatically, and the image will be regenerated to reflect the changes. The colour samples will appear in the Colour Sample table, and the number of colours will appear in the Colour Counter.

To create a new palette

Set a number of colour in the Colour Counter
- or –
edit the palette in the Colour Sample table.
Press the button
Observe the changes in the Preview window. When the best result are achieved press OK.

To select colour(s)

Pick a colour in the Colour Sample table; hold SHIFT for continuous selection;
- or –
press the button , pick a point in the image; the selected colour will be selected in the Colour Samples table;
- or -

press the button , draw a polygon around the desired area in the image. The colours within the polygon will be selected in the Colour Samples table.
Observe selected colours in the image using the View Selection tool.
Select the checkbox ; a colour located next to the checkbox is used as a highlight colour. Pressing on this colour invokes the dialog for highlight colour selection.

To delete a colour from a palette

Select colour(s) to delete.
Press the button .
Reduce the number of colours by setting the number in the Colour counter and pressing the button.

To add or replace a colour in the palette

To replace a colour, click on the colour sample to replace, or to add a colour select an unoccupied space in the colour table.
Press the RGB button in the Colour Correction dialog and choose a new colour to add or replace an existing colour with.