### 4.8. Editor de seleções

O comandoEditor de seleções exibe a janela de diálogo do “Editor de seleções”. Esta caixa de diálogo exibe a seleção ativa na imagem atual, que está sendo trabalhada, e fornece a você acesso rápido aos comandos relacionados à seleção. Ele não se destina realmente a edição das seleções diretamente, mas se você estiver trabalhando em uma seleção, é mais prático ter os comandos todos a mão, juntos, de fácil acesso, uma vez que é mais fácil clicar em um botão do que procurar os comandos nas janelas de menus. O “Editor de seleções ” também oferece opções avançadas para o comando “Seleção para vetor”

#### 4.8.1. Ativando o comando.

You can access this command from the main menu through Select → Selection Editor.

#### 4.8.2. Descrição da janela de diálogo do “Editor de seleções”

Figura 16.19. A janela de diálogo do comando “Editor de seleções”

Os botões

  A janela de diálogo do “Editor de seleções” tem vários botões que permitem acessar facilmente todos os comandos de seleção.

  - The Select All button.

  - The Select None button.

  - The Select Invert button.

  - The Save to Channel button.

  - The To Path button. If you hold the Shift key while clicking on this button, the Advanced Settings dialog is displayed. Please see the next section for details about these options.

  - The Stroke Selection button.

A janela de exibição

  Na janela de exibição, as áreas selecionadas são brancas, e as não selecionadas são pretas, e áreas parcialmente selecionadas são cinzas. Clicar nessa janela funciona como a ferramenta de Selecionar por cor. Veja o exemplo abaixo.

Figura 16.20. Exemplo de clicar na janela de exibição “Editor de seleção”

Selection Editor window after clicking.

Image with the resulting selection applied.

#### 4.8.3. The “Selection to Path Advanced Settings” dialog

Figura 16.21. A janela de diálogo dos “Ajustes avançados”

A caixa de diálogo “Seleção para vetor Ajustes avançados” , que você pode obter clicando no botão Seleção para vetor mantendo a tecla Shift pressionada, contém um número de opções, muitas das quais você pode ajustar com um controle deslizante ou uma caixa de texto. Há também uma caixa de seleção. Estas opção são geralmente usadas por usuários mais avançados. São elas :

Align Threshold

  If two endpoints are closer than this value, they are made to be equal.

Corner Always Threshold

  If the angle defined by a point and its predecessors and successors is smaller than this, it is a corner, even if it is within Corner Surround pixels of a point with a smaller angle.

Corner Surround

  Number of points to consider when determining if a point is a corner or not.

Corner Threshold

  If a point, its predecessors, and its successors define an angle smaller than this, it is a corner.

Error Threshold

  Amount of error at which a fitted spline[5] is unacceptable. If any pixel is further away than this from the fitted curve, the algorithm tries again.

Filter Alternative Surround

  A second number of adjacent points to consider when filtering.

Filter Epsilon

  If the angles between the vectors produced by Filter Surround and Filter Alternative Surround points differ by more than this, use the one from Filter Alternative Surround.

Filter Iteration Count

  The number of times to smooth the original data points. Increasing this number dramatically, to 50 or so, can produce vastly better results. But if any points that “should” be corners aren't found, the curve goes wild around that point.

Filter Percent

  To produce the new point, use the old point plus this times the neighbors.

Filter Secondary Surround

  Number of adjacent points to consider if Filter Surround points defines a straight line.

Filter Surround

  Number of adjacent points to consider when filtering.

Keep Knees

  This check box says whether or not to remove “knee” points after finding the outline.

Line Reversion Threshold

  If a spline is closer to a straight line than this value, it remains a straight line, even if it would otherwise be changed back to a curve. This is weighted by the square of the curve length, to make shorter curves more likely to be reverted.

Line Threshold

  How many pixels (on the average) a spline can diverge from the line determined by its endpoints before it is changed to a straight line.

Reparametrize Improvement

  If reparameterization doesn't improve the fit by this much percent, the algorithm stops doing it.

Reparametrize Threshold

  Amount of error at which it is pointless to reparameterize. This happens, for example, when the algorithm is trying to fit the outline of the outside of an “O” with a single spline. The initial fit is not good enough for the Newton-Raphson iteration to improve it. It may be that it would be better to detect the cases where the algorithm didn't find any corners.

Subdivide Search

  Percentage of the curve away from the worst point to look for a better place to subdivide.

Subdivide Surround

  Number of points to consider when deciding whether a given point is a better place to subdivide.

Subdivide Threshold

  How many pixels a point can diverge from a straight line and still be considered a better place to subdivide.

Tangent Surround

  Number of points to look at on either side of a point when computing the approximation to the tangent at that point.

[5] “Spline” is a mathematical term for a function which defines a curve by using a series of control points, such as a Bézier curve.

See Wikipedia for more information.

4.7. Selection From Paths |  | 4.9. Enevoar

Report a bug in GIMP Report a documentation error