### 6.5. Záře z přechodu

#### 6.5.1. Overview

Obrázek 17.116. Example for the Gradient Flare filter

Original image

Filter applied

Tento filtr lze spustit z nabídky Filtry → Efekty se světlem → Záře z přechodu

| Poznámka
If the image is in indexed mode, this menu entry is disabled.

#### 6.5.2. Activating the Filter

This filter is found in the main menu under Filters → Light and Shadow → Gradient Flare….

#### 6.5.3. Options

The Settings tab allows you to set manually the parameters while the Selector tab let you choose presets in a list.

Preview

  When Auto update preview is checked, parameter setting results are interactively displayed in preview without modifying the image until you click on OK button.

##### 6.5.3.1. Nastavení

Obrázek 17.117. „Gradient Flare“ filter options (Settings)

Střed

  You can set the X and Y (pixels) coordinates using the input box or by clicking in the preview. The coordinate origin is at the upper left corner.

Parametry
  Poloměr

    The radius of the effect. The slider limits the range of possible values, but using the input box you can enter greater values.

  Rotace

    Turn the effect.

  Hue rotation

    Change the tint (color) of the effect.

  Vector angle

    Turn the Second flares.

  Vector length

    Vary the distance applied for the Second flares.

Adaptivní převzorkování

  When enabled, adaptive supersampling, an anti-aliasing technique, is used when rendering the image. See Supersampling for more information.

  Enabling this setting activates the following options that can be used to adjust the supersampling.

  Max depth

    Specifies the maximum depth for supersampling. This determines the number of samples used. Higher values may produce better results, but can potentially slow down the computation.

  Threshold

    Specifies the lower threshold of pixel difference that stops supersampling.

##### 6.5.3.2. Selektor

Obrázek 17.118. „Gradient Flare“ filter options (Selector)

Karta Selektor umožňuje vybrat mezi hotovými uloženými nastaveními, případně uložená nastavení upravit či uložit nová.

New

  Kliknete-li na toto tlačítko, vytvoří se nová sada nastavení, kterou můžete pojmenovat podle libosti.

Úpravy

  This button brings up the Gradient Flare Editor (see below).

Kopírovat

  Tímto tlačítkem lze vytvořit kopii existující sady nastavení. Kopii můžete libovolně pojemnovat.

Delete

  Tímto tlačítkem můžete smazat vybranou sadu nastavení.

#### 6.5.4. Editor záře z přechodu

The Gradient Flare Editor is also organized in tabs:

##### 6.5.4.1. Všeobecné

Obrázek 17.119. „Gradient Flare Editor“ options (General)

Volby vykreslení záře
  Krytí

    Slider and input box allows you to reduce glow opacity (0-100).

  Paint mode

    You can choose between four modes:

    Normální

      In this mode, the glow covers the image without taking into account what is beneath.

    Součet

      Pixel RGB values of glow are added to RGB values of the corresponding pixels in the image. Colors get lighter and white areas may appear.

    Překrytí

      Light/Dark areas of glow enhance corresponding light/dark areas of image.

    Obrazovka

      Dark areas of image are enlightened by corresponding light areas of glow. Imagine two slides projected onto the same screen.

Volby kreslení paprsků

  Options are the same as for GlowPaintOptions.

Volby kreslení druhé záře

  Options are the same as for GlowPaintOptions.

##### 6.5.4.2. Žár

Obrázek 17.120. „Gradient Flare Editor“ options (Glow)

Přechody

  By clicking on the rectangular buttons, you can develop a long list of gradients. „%“ gradients belong to the Editor.

  Radial gradient

    The selected gradient is drawn radially, from center to edge.

  Angular gradient

    The selected gradient develops around center, counter-clockwise, starting from three o'clock if the Rotation parameter is set to 0. Radial and angular gradients are combined according to the Multiply mode: light areas are enhanced and colors are mixed according to CMYK color system (that of your printer).

  Angular size gradient

    This is a gradient of radius size which develops angularly. Radius is controlled according to gradient Luminosity: if luminosity is zero (black), the radius is 0%. If luminosity is 100% (white), the radius is also 100%.

Parametry
  Size (%)

    Sets size of glow in percent (0-200).

  Rotace

    Sets the origin of the angular gradient (-180 +180).

  Hue rotation

    Sets glow color, according to the HSV color wheel (-180 +180). (Cf. The triangle color selector.)

##### 6.5.4.3. Paprsky

Obrázek 17.121. „Gradient Flare Editor“ options (Rays)

Přechody

  The options are the same as for Glow.

Parametry

  The first three options are the same as in Glow. Two are new:

  # of Spikes

    This option determines the number of spikes (1-300) but also their texture.

  Spike thickness

    When spikes get wider (1-100), they look like flower petals.

##### 6.5.4.4. Druhá záře

Obrázek 17.122. „Gradient Flare Editor“ options (Second Flares)

Přechody

  The options are the same as for Glow.

Parametry

  The options are the same as for Glow.

Tvar druhé záře

  Second flares, these satellites of the main flare, may have two shapes: Circle and Polygon. You can set the Number polygon sides. The option accepts 1 side (!), not 2.

Hnízdo náhodných čísel, New Seed

  This option controls the randomness of the filter. The Random seed box lets you manually enter a seed for the randomization algorithm used. You can also generate a random seed by pressing the New Seed button. If the same random seed is used in the same situation, the filter produces exactly the same results. A different random seed produces different results.

Randomize

  When you click on this button, you produce a random seed that will be used by the random generator. It is each time different.

6.4. Efekt odlesku |  | 6.6. Světelné efekty

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