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Photoshop利用色彩原理去背景

2006-01-14 19:29:08  编辑来源:互联网  宽屏版  评论
 
 

本文为【Photoshop利用色彩原理去背景】的汉字拼音对照版显示拼音

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Photoshop利用色彩原理去背景


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前几天在某图象处理论坛看到一个帖子,要把黑色背景中的水柱图象提取出来的问题。说实话,纯黑或者纯白的背景的图基本不存在什么抠图问题,只要你了解Photoshop中的几个基本概念就可以解决了。在这里就这个话题说说几个概念(不是从理论上去探讨概念,只是简单说明性的概念),很简单,但是确实很多人不注意。   首先我想说说两种色彩模式,RGB和CMYK。   RGB模式:   就是按照自然界里三种基本色混合的原理而做的一种模式。就是red(红)、green(绿)、blue(蓝)混合,通过三种基本颜色亮度值从0~255不同产生出其他各种颜色,这种模式叫加色模式。为什么叫加色模式呢,举个例子好了,我们通常使用的电视屏幕和电脑屏幕上的显示就是这样的模式,在没有图象时,屏幕是黑的,若R,G,B三色亮度都为255时混合叠加打在屏幕上时则显示成白色。就是加起来是白色的意思,叫加色模式。(呵呵,所以买显示器的时候,没通电前显示器越黑越是好显示器,走题了,打住打住。)   为了说明这个,我先来做个图大家看看,打开Photoshop7.0,新建立三个图层,每个层上绘制个圆,分别给这三个圆填充上R,G,B三种颜色(色彩值最好在拾色器中通过数值输入),然后把三个层的图层混合模式都改成screen(屏幕)模式,你会发现图象消失了,555,惨了~!没关系,把背景层隐藏掉,结果如图1所示: [url=http://www.wangchao.net.cn/bbs/hydetail_82178.html][img]http://www.duomeiti8.org/MPicture/UploadFiles/200512113572734.gif[/img][/url] (插图1)   从上图可以看出,三种颜色交界处变成了白色,对,RGB模式就是这样的原理。   CMYK模式:   这是种印刷模式,是用Cyan(青色)、Megenta(品红),Yellow(黄)、Black(黑)四种颜色混合,其实就是四种颜色的油墨混合,印刷当然是使用油墨了。这种模式叫减色模式,为什么叫减色模式呢。因为印刷是印在纸上的,纸一般都是白色的,有油墨涂上去才显示颜色,当C、M、Y三种颜色油墨完全混合则产生了黑色,因此,减去颜色才是白色嘛,所以叫减色模式。 同样,做个图大家看,打开Photoshop7.0,新建立一个文件,注意新建文件色彩模式为CMYK模式的哟,然后新建立三个层,画圆每个层上绘制个圆,分别给这三个圆填充上C,M,Y三色,把三个层的混合模式都改为Multiply(正片叠底)的模式,隐藏背景层,效果如图2: [url=http://www.wangchao.net.cn/bbs/hydetail_82178.html][img]http://www.duomeiti8.org/MPicture/UploadFiles/200512113572580.gif[/img][/url] (插图2)   好的,混合后三种颜色交界处就是黑色,这就是CMYK模式的了。   刚才我们已经使用到了屏幕模式和正片叠底模式,那我顺便先讲下这两混合模式的概念: 正片叠底(减色模式):此模式会根据作用图层图像(或是填入图案)的色彩,与下层图像(原图像)的色彩产生加深的作用效果,所以颜色会变得较深。   屏幕(加色模式):此模式正好和正片叠底模式相反,它是根据两者的色彩产生变亮的作用效果,所以整个亮度会提高,颜色会变浅。   因此黑色背景的图根本不用