四色渐变滤镜生成一个四种颜色的渐变效果。
因为中灰渐变滤镜被弄湿和太阳的耀光，主图在靠近太阳的部位有奇怪的光点，所以我不得不把这些克隆出来。
The main image suffered from a strange spotting effect near the sun due to a combination of a wet GND filter and sun flare, so I had to clone these out.
你在这一部分可以学到如何组合界面元素，建立色彩渐变，绘制图像的反射，以及给图像加上滤镜。
It is here that you learn how to use composites, create gradients, draw reflections, and apply filters to images.
你在这一部分可以学到如何组合界面元素，建立色彩渐变，绘制图像的反射，以及给图像加上滤镜。
It is here that you learn how to use composites, create gradients, draw reflections, and apply filters to images.
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