Python图形图像处理库的介绍之ImageEnhance模块(图像增强)
ImageEnhance模块import ImageEnhance
enhancer = ImageEnhance.Sharpness(image)
for i in range(8):
factor = i / 4.0
enhancer.enhance(factor).show()
所有的图片增强类都实现了一个通用接口，这个接口只包含一个方法：
enhance(factor)
先构造一个增强器，然后调用增强器实现的enhance()接口，这个方法会返回一个被加强过的image对象，参数factor为一个大于0的浮点数，1表示返回原始图片。
加强器包括，色彩平衡，亮度平衡，对比度，锐化度等。通过使用这些加强器，可以很轻松的做到图片的色彩调整，亮度调整，锐化等操作，google picasa中提供的一些基本的图片加强功能都可以实现。
先面分别看一下这几个加强器:
颜色加强color
用于调整图片的色彩平衡，相当于彩色电视机的色彩调整。这个类实现了上边提到的接口的enhance方法。
ImageEnhance.Color(img)#获得色彩加强器实例
然后即可使用enhance(factor)方法进行调整。
http://abruzzi.iteye.com/upload/attachment/80876/ad802694-8873-344f-9b9c-9dd54e333208.jpg
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亮度加强brightness
用于调整图片的明暗平衡。
ImageEnhance.Brightness(img)#获得亮度加强器实例
factor=1返回一个黑色的图片对象，0返回原始图片对象
http://abruzzi.iteye.com/upload/attachment/80903/4411e4d5-b7cc-3466-8d49-f97056c025ec.jpg
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对比度加强contrast
用于调整图片的对比度，相当于彩色电视机的对比度调整。
ImageEnhance.Contrast(image) #获得对比度加强器实例
http://abruzzi.iteye.com/upload/attachment/80919/4dde6a6e-c66b-3b65-8315-567c6b790893.jpg
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锐化度加强sharpness
用于锐化/钝化图片。
ImageEnhance.Sharpness(image) #返回锐化加强器实例
应该注意的是锐化操作的factor是一个0-2的浮点数，当factor=0时，返回一个完全模糊的图片对象，当factor=1时，返回一个完全锐化的图片对象，factor=1时，返回原始图片对象
http://abruzzi.iteye.com/upload/attachment/80935/d73131f8-1865-3b50-97df-c4877270c01f.jpg
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