iphone解析度終極指南(含iphone6/6+)

iphone解析度終極指南(含iphone6/6+)

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原文及翻譯文本

Points
點

At the beginning, coordinates of all drawings are specified in points.
在以開始，所有的圖形位置都由座標點指定。
Points are abstract units, they only make sense in this mathematical coordinate space.
點是抽象的單位，它們只在邏輯座標繫上有意義。



Rendered Pixels
像素渲染

Point-based drawings are rendered into pixels. This process is known as rasterization
基於點的映像被渲染為像素，這個過程被稱為柵格化。
Point coordinates are multiplied by scale factor to get pixel coordinates. Higher scale factors result in higher level of detail.
點座標和比例係數相乘得到像素座標。更高的比例因素會顯示更多細節。


Physical Pixels
物理像素

The device screen may have lower pixel resolution than the image rendered in previous step.
裝置螢幕所能呈現的解析度可能要比上一步驟底。
Before the image can be displayed, it must be downsampled (resized) to lower pixel resolution.
要顯示之前的映像，必須以較低的像素解析度重新採樣(調整大小)。


Physical Device
物理裝置

Finally, computed pixels are displayed on the physical screen.
最後，計算的像素被顯示在物理螢幕上。
The PPI number tells you how many pixels fit into one inch and thus how large the pixels appear in the real world.
PPI數決定一英寸裝入多少像素，從而把較大的物理像素顯示到真實螢幕上。