所以我让三个图像透明并将它们叠加在一起。我在这篇文章中遵循了示例代码:Remove Image background with php and save transparent png但是提取的图像周围都有难看的白色边框,因为图像没有完全统一的单色背景。尽管它们可能看起来是白色的,但实际上通常会涉及不同深浅的灰色甚至蓝色。
所以现在我想删除图像中这些难看的白色边框。我在网上找到了一个解决问题的java函数:http ://www.logikdev.com/2011/10/05/make-image-backgrounds-transparent-with-tolerance/这是他使用的代码:
private Image makeColorTransparent(final BufferedImage im, final Color color, int tolerance) {
int temp = 0;
if (tolerance < 0 || tolerance > 100) {
System.err.println("The tolerance is a percentage, so the value has to be between 0 and 100.");
temp = 0;
} else {
temp = tolerance * (0xFF000000 | 0xFF000000) / 100;
}
final int toleranceRGB = Math.abs(temp);
final ImageFilter filter = new RGBImageFilter() {
// The color we are looking for (white)... Alpha bits are set to opaque
public int markerRGBFrom = (color.getRGB() | 0xFF000000) - toleranceRGB;
public int markerRGBTo = (color.getRGB() | 0xFF000000) + toleranceRGB;
public final int filterRGB(final int x, final int y, final int rgb) {
if ((rgb | 0xFF000000) >= markerRGBFrom && (rgb | 0xFF000000) <= markerRGBTo) {
// Mark the alpha bits as zero - transparent
return 0x00FFFFFF & rgb;
} else {
// Nothing to do
return rgb;
}
}
};
final ImageProducer ip = new FilteredImageSource(im.getSource(), filter);
return Toolkit.getDefaultToolkit().createImage(ip);
}
但我不知道如何用 php 做到这一点。谁能帮助我?