5.13. Rozšířit hodnotu

5.13.1. Overview

Obrázek 17.78. Example for the Value Propagate filter

Example for the Value Propagate filter

Original image

Example for the Value Propagate filter

Filter Value Propagate applied

This filter works on color borders. It spreads pixels that differ in a specified way from their neighboring pixels.

5.13.2. Activating the filter

This filter is found in the image window menu under FiltersDistortsValue Propagate….

5.13.3. Options

Obrázek 17.79. Value propagate filter options

„Value propagate“ filter options

Presets, Preview, Split view
[Poznámka] Poznámka

These options are described in 2 – „Common Features“.


The examples will be about the following image:

Více bílé

Pixely se rozšiřují od vyšší hodnoty k nižší hodnotě. Rozšíří se tak jasné oblasti.

Obrázek 17.80. Více bílé

Více bílé

Bright pixels have been propagated to dark pixels in the four directions : top, bottom, right and left. Filter applied several times to increase effect.

Více černé

Pixely se rozšiřují od nižší hodnoty k vyšší hodnotě. Rozšíří se tak tmavé oblasti.

Obrázek 17.81. Více černé

Více černé

Obrázek 17.82. To bottom only

To bottom only

The same as above with To bottom direction only checked.

Střední hodnota do špiček

Na hranici mezi zvolenými prahy barvy splývají.

Obrázek 17.83. Střední hodnota do špiček

Střední hodnota do špiček

A thin border with a transitional color has been added to objects. It is not visible around objects with smoothed borders.

Střední hodnota do špiček

Green area zoomed x800. A thin border (one pixel wide) has been added. Its value is the average between grey (90%) and green (78%) : (90 + 78) / 2 = 84.

Color to peaks

Rozšířené oblasti jsou vyplněny barvou popředí.

A color selector opens, with a color picker.

Obrázek 17.84. Color to peaks

Color to peaks

In this example, the selected color is Red. A thin border, one pixel wide, red, is added around objects. With smoothed objects, this border is located at the furthest limit of smoothing. Here, another border appears inside. This is an artifact due to the small size of the object which makes the smoothing area of opposite sides to overlap.

Only color

Only areas with the selected color will propagate. With this option, soft and fuzzy edges don't propagate well.

Obrázek 17.85. Only color

Only color

In this example, the selected color is that of the green object. After applying filter several times, the green area is clearly enlarged.

More opaque, More transparent

These commands work like More white and More black. Opaque (transparent) areas will be propagated over less opaque (transparent) areas. These commands need an image with an alpha channel.

Obrázek 17.86. More opaque

More opaque

Original layer, with a transparent background.

More opaque

Filter applied several times: the green, opaque, area got increased.

Lower threshold, Upper threshold

Dolní práh a Horní práh: Určují rozsah rozšiřovaných hodnot.

Poměr rozšíření

Poměr rozšíření: Velikost rozšíření. Čím vyšší, tím barevnější rozšíření.

To top, To left, To right, To bottom

Směr rozšíření: Zde lze zvolit jeden či více směrů.

Rozšíření v kanálu hodnot

If checked, the pixel's color channels (gray channel on grayscaled images) will be propagated. The option is checked by default, of course.

Propagating alpha channel

If checked, the pixel alpha value will be propagated, otherwise the pixel will get the alpha of the neighboring pixels.


The result of this filter can be larger than the original image. With the default Adjust option, the layer will be automatically resized as necessary when the filter is applied. With the Clip option the result will be clipped to the layer boundary.

5.13.4. Using Value Propagate

Left: Original........Middle: More white........Right: More black