真彩色与假彩色的区别

 

真彩色:

真彩色是指图像中每个像素值都分成RGB三个基色分量,每个基色分量直接决定其基色的强度,这样的色彩为真彩色。

根据彩色合成原理,可选择同一目标的单个多光谱数据合成一幅彩色图像,当合成图像的红绿蓝三色与三个多光谱段相吻合,这幅图像就再现了地物的彩色原理,就称为真彩色的合成。

假彩色:

遥感影像采用截止滤光技术、假彩色胶片摄影或经彩色合成后形成颜色,它并非该物体的天然颜色。如绿色植物变成了红色

彩色合成是利用同一地区或景物的不同波段的黑白图像,分别通过不同的滤光系统,使其相应影像准确的重合,生成该地区或景物的彩色图像的技术过程。彩色合成首先必须得到同一地区的分光或不同波段的负片。然后根据合成所采用的技术方法,选用分光正片或负片,再经过分别滤光或加色,并准确重合后得到彩色图像。若取得分光负片和彩色合成所采用的滤光系统不一致又一一对应,得到图像的彩色与实际彩色则不一致,称为假彩色。

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吾爱地理 » 真彩色与假彩色的区别
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