5.13. Razširi vrednost
| 5. Distort Filters |

### 5.13. Razširi vrednost

#### 5.13.1. Pregled

Slika 17.84. Example for the Value Propagate filter

Izvirnik

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. Aktiviranje filtra

This filter is found in the image window menu under Filters → Distorts → Value Propagate….

#### 5.13.3. Možnosti

Slika 17.85. “Value propagate” filter options

Presets, “Input Type”, Clipping, Blending Options, Preview, Split view

  | Opomba
  These options are described in Razdelek 2, “Common Features”.

Način

  The examples will be about the following image:

  Več beline (večja vrednost)

    Pixels will be propagated from upper value pixels towards lower value pixels. So bright areas will enlarge.

    Slika 17.86. Več beline

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

  Več črnine (manjša vrednost)

    Pixels will be propagated from lower value pixels towards upper value pixels. So dark areas will enlarge.

    Slika 17.87. Več črnine

    Slika 17.88. To bottom only

    The same as above with To bottom direction only checked.

  Srednja vrednost v vrhove

    On a border between the selected thresholds, the average of both values is propagated.

    Slika 17.89. Srednja vrednost v vrhove

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

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

  Color to peaks

    The propagated areas will be filled with the foreground color of the toolbox.

    A color selector opens, with a color picker.

    Slika 17.90. 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.

    Slika 17.91. 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.

  Bolj prekrivno, Bolj prosojno

    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.

    Slika 17.92. Bolj prekrivno

    Original layer, with a transparent background.

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

Nižji prag, Višji prag

  A pixel will be propagated (spread) if the difference in value between the pixel and its neighbor is no smaller than the lower threshold and no larger than the upper threshold.

Hitrost razširjanja

  That's the propagating amount. The higher it will be the more colored the propagation will be.

Na vrh, Na levo, Na desno, Na dno

  You can select one or more directions.

Razširjanje kanala vrednosti

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

Razširjanje kanala alfa

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

#### 5.13.4. Using Value Propagate

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

5.12. Spherize |  | 5.14. Video

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