Image Filter Bar
This icon on the Image bar opens the Image Filter bar, where you can use various filters on the selected picture.
Filter
Invert
Inverts the colour values of a colour image, or the brightness values of a greyscale image. Apply the filter again to revert the effect.
Invert
Smooth
Softens or blurs the image by applying a low pass filter.
Smooth
Sharpen
Sharpens the image by applying a high pass filter.
Sharpen
Remove Noise
Removes noise by applying a median filter.
Remove Noise
Solarisation
Opens a dialogue box for defining solarisation. Solarisation refers to an effect that looks like what can happen when there is too much light during photo development. The colours become partly inverted.
Solarisation
Parameters
Specifies the degree and type of solarisation.
Threshold Value
Specifies the degree of brightness, in percent, above which the pixels are to be solarised.
Invert
Specifies whether the pixels to be solarised are also to be inverted.
Ageing
All pixels are set to their grey values, and then the green and blue colour channels are reduced by the amount you specify. The red colour channel is not changed.
Ageing
Ageing Degree
Defines the intensity of ageing, in percent. At 0% you see the grey values of all pixels. At 100% only the red colour channel remains.
Posterise
Opens a dialogue box to determine the number of poster colours. This effect is based on the reduction of the number of colours. It makes photos look like paintings.
Posterise
Poster Colours
Specifies the number of colours to which the image is to be reduced.
Pop Art
Converts an image to a pop-art format.
Pop Art
Charcoal Sketch
Displays the image as a charcoal sketch. The contours of the image are drawn in black, and the original colours are suppressed.
Charcoal Sketch
Relief
Displays a dialogue box for creating reliefs. You can choose the position of the imaginary light source that determines the type of shadow created, and how the graphic image looks in relief.
Relief
Light Source
Specifies the light source position. A dot represents the light source.
Mosaic
Joins small groups of pixels into rectangular areas of the same colour. The larger the individual rectangles are, the fewer details the graphic image has.
Mosaic
Element resolution
Determines the number of pixels to be joined into rectangles.
Width
Defines the width of the individual tiles.
Height
Defines the height of the individual tiles.
Enhance edges
Enhances, or sharpens, the edges of the object.