PPT 的好坏见仁见智，我仅从能否在工作场景下使用来主观评判；
Current X-ray lasers require facilities that are kilometres long. A cavity-based set-up about 66 metres in length has been developed that uses highly reflective mirrors to enable the generation of high-intensity pulses of narrow-band X-ray radiation. This promises to overcome the limitations of current X-ray lasers.
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"At the River Itchen we have more than £70m worth of improvements to improve water quality as part of a wider plan for the River Test and Itchen, we will be announcing these in more detail later this year."
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This time, before we perturb the input image, we take the value given by the threshold matrix and divide it by , where is the number of levels for each colour component. As a result, each pixel is perturbed just enough to cover the minimal distance between two colours in the palette. Since the entire palette is evenly distributed across colour space, we only need to modify the range of perturbation along each axis. The dithering equation then becomes:
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