的高度和宽度的形象代表的像素数量，将填补渲染窗口。
The height and width of the image represent the number of pixels that will fill the rendering window.
减小像素尺寸可以在相同尺寸的传感器上大大的提高像素数量。
The advantage of a reduced pixel size could dramatically increase the number of pixels that could fit into a sensor of the same size.
边界指的是图像的每一个边框，这个边框的像素数量是不随着图片缩放而变化的。
The number of pixels that will not scale with the texture at each edge of the image.
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