imagesetinterpolation

    (PHP 5 >= 5.5.0, PHP 7, PHP 8)

    imagesetinterpolation — Set the interpolation method

    Опис

    imagesetinterpolation(GdImage $image, int $method = IMG_BILINEAR_FIXED): bool

    Sets the interpolation method, setting an interpolation method affects the rendering of various functions in GD, such as the imagerotate() function.

    Параметри

    image

    Об'єкт GdImage, що повертається однією з функцій створення зображення, такою як imagecreatetruecolor().

    method

    The interpolation method, which can be one of the following:

    Значення, що повертаються

    Повертає true у разі успіху або false в разі помилки.

    Журнал змін

    Версія Опис
    8.0.0 Тепер image має бути примірником GdImage. Раніше очікувався gd-resource.

    Приклади

    Приклад #1 imagesetinterpolation() example

    <?php
    // Load an image
    $im = imagecreate(500, 500);

    // By default interpolation is IMG_BILINEAR_FIXED, switch
    // to use the 'Mitchell' filter:
    imagesetinterpolation($im, IMG_MITCHELL);

    // Continue to work with $im ...
    ?>

    Примітки

    Changing the interpolation method affects the following functions when rendering:

    Прогляньте також

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    User Contributed Notes 1 note

    up
    -1
    shaun at slickdesign dot com dot au
    6 years ago
    Setting the interpolation does not carry through to any images created by imageaffine() or imagerotate(). It defaults to IMG_BILINEAR_FIXED and would need to be set on each generated image as required.

    <?php
    imagesetinterpolation    ( $image, IMG_NEAREST_NEIGHBOUR );

    // Rotated using IMG_NEAREST_NEIGHBOUR
    $rotated = imagerotate( $image, 45, $transparent );

    // Rotated using IMG_BILINEAR_FIXED
    $rotated_again = imagerotate( $rotated, 45, $transparent );
    ?>

    Setting the interpolation to IMG_NEAREST_NEIGHBOUR can help to preserve details and prevent sampling issues when rotating an image at 90 degree increments, including when rotating clockwise.

    <?php
    // Rotated image can appear blurred and on a slight angle.
    $rotated = imagerotate( $image, -360, $transparent );

    // Similar to starting Image although it may still show a background or be on a slight angle.
    imagesetinterpolation( $image, IMG_NEAREST_NEIGHBOUR );
    $rotated = imagerotate( $image, -360, $transparent );
    ?>
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