Method: Magick::Image#tint

Defined in:
ext/RMagick/rmimage.cpp

#tint(tint, red_alpha, green_alpha = red_alpha, blue_alpha = red_alpha, alpha_alpha = 1.0) ⇒ Object

Applies a color vector to each pixel in the image.

  • Alpha values are percentages: 0.10 -> 10%.

Returns a new image.

Parameters:

  • tint (Magick::Pixel, String) —

    the color name

  • red_alpha (Numeric) —

    the red value

  • green_alpha (Numeric) (defaults to: red_alpha) —

    the green value

  • blue_alpha (Numeric) (defaults to: red_alpha) —

    the blue value

  • alpha_alpha (Numeric) (defaults to: 1.0) —

    the alpha value

Returns:

  • a new image



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# File 'ext/RMagick/rmimage.cpp', line 14434

VALUE
Image_tint(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    PixelColor tint;
    double red_pct_opaque, green_pct_opaque, blue_pct_opaque;
    double alpha_pct_opaque = 1.0;
    char alpha[50];
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 2:
            red_pct_opaque   = NUM2DBL(argv[1]);
            green_pct_opaque = blue_pct_opaque = red_pct_opaque;
            break;
        case 3:
            red_pct_opaque   = NUM2DBL(argv[1]);
            green_pct_opaque = NUM2DBL(argv[2]);
            blue_pct_opaque  = red_pct_opaque;
            break;
        case 4:
            red_pct_opaque     = NUM2DBL(argv[1]);
            green_pct_opaque   = NUM2DBL(argv[2]);
            blue_pct_opaque    = NUM2DBL(argv[3]);
            break;
        case 5:
            red_pct_opaque     = NUM2DBL(argv[1]);
            green_pct_opaque   = NUM2DBL(argv[2]);
            blue_pct_opaque    = NUM2DBL(argv[3]);
            alpha_pct_opaque   = NUM2DBL(argv[4]);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 5)", argc);
            break;
    }

    if (red_pct_opaque < 0.0 || green_pct_opaque < 0.0
        || blue_pct_opaque < 0.0 || alpha_pct_opaque < 0.0)
    {
        rb_raise(rb_eArgError, "alpha percentages must be non-negative.");
    }

    snprintf(alpha, sizeof(alpha),
            "%g,%g,%g,%g", red_pct_opaque*100.0, green_pct_opaque*100.0,
            blue_pct_opaque*100.0, alpha_pct_opaque*100.0);

    Color_to_PixelColor(&tint, argv[0]);
    exception = AcquireExceptionInfo();

#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(TintImage) args = { image, alpha, &tint, exception };
#else
    GVL_STRUCT_TYPE(TintImage) args = { image, alpha, tint, exception };
#endif
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(TintImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}