iphone分辨率終極指南(含iphone6/6+) – iPhone手機開發技術文章 iPhone軟體開發教學課程

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Points

At the beginning, coordinates of all drawings are specified in points.
在以開始,所有的圖形位置都由坐標點指定。
Points are abstract units, they only make sense in this mathematical coordinate space.
點是抽象的單位,它們隻在邏輯坐標系上有意義。

Rendered Pixels
像素渲染

Point-based drawings are rendered into pixels. This process is known as rasterization
基於點的圖像被渲染為像素,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.
點坐標和比例系數相乘得到像素坐標。更高的比例因子會顯示更多細節。

Physical Pixels
物理像素

The device screen may have lower pixel resolution than the image rendered in previous step.
設備屏幕所能呈現的分辨率可能要比上一步驟底。
Before the image can be displayed, it must be downsampled (resized) to lower pixel resolution.
要顯示之前的圖像,必須以較低的像素分辨率重新采樣(調整大小)。

Physical Device
物理設備

Finally, computed pixels are displayed on the physical screen.
最後,計算的像素被顯示在物理屏幕上。
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屏幕上。

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