通常,在线辩论的主题是珊瑚照片的后处理 - 通过软件对珊瑚图像进行调整和曝光水平的操纵。珊瑚图像的后处理是一个特别热门的问题,因为可以滥用它。不熟悉这种做法的业余爱好者可能会决定根据一张精美的照片在线购买珊瑚,一旦收到它,他们就会感到失望,因为照片是由于大量后期处理的结果。
Half the equation
一些reefkeeping布y associate post processing with deceptive trade practices, which is unfortunate because post processing is merely a tool. That may be an understatement because post processing is half of digital photography. Let me repeat that: Post processing is half of photography.
Let’s say, for example, that you are hiring a wedding photographer and the first candidate proclaims he doesn’t do any post processing and whatever comes straight out of the camera is what makes it to print. If it were my wedding, I would strongly consider other photographers. Implying that an image shot by the camera left unaltered is somehow more “pure” or “less fake” than one that has been post processed is a misunderstanding of what is actually occurring.
没有未经处理的“图像”之类的东西
数码相机非常是一种模拟收集设备。在不深入了解数字传感器讨论的情况下,人们可以想象一个数字传感器是一系列收集光的水桶。然后,相机测量了这些桶的光,并将它们转换为数字信息,即1和0,将其包装到一个文件中。不可能直接查看此文件。这不是可见的图像;这只是数据。作为预览的弹出的是,此数据的无限转换为可见图像。从本质上讲,相机正在为您进行处理。从定义上看,您可以看到图像的那一刻。问题是,相机是否可以比专业软件程序可以做得更好。
在大多数情况下,答案是否定的。与过去的几年相比,今天的摄像机在启动优质的JPEG文件方面做得更好。但是,没有什么能真正比将图像微调的能力更加胜过所需的外观。实际上,一些高端摄像机输出一个文件,该文件为摄影师提供了后期处理中最纬度。
This is especially true in cinema. Manufacturers of high-end cinema cameras, such as Arri and RED, output a file that looks bad at first glance. The picture is gray and flat by design. That image is designed to have the most image information possible for the editors to color grade it in post. In this case, the more gray and flat the image, the better. If my wedding videographer showed up with a $60,000 RED camera and said he is going to make an untouched video of what comes out of the camera, I can assure you it would look horrible.
这里的关键是“大多数情况”。完全有可能使用专业工具屠宰图像,这也是一个值得避免的情况。大多数为珊瑚拍照的人不是专业的调色师,结果可能是全董事会成员。珊瑚产业中的人们将继续过度处理图像,因此很有可能,因此,重要的是要了解Telltale标志以避免将来的失望。
编辑图像的三种方法
In a professional photo-editing suite, there are numerous options available to manipulate a photo. Having said that, there are three ways that an image typically gets edited: white balance, black point, and saturation.
White balance, despite its name, affects the color temperature of the image. By changing the white balance of the image, one can change the look of the coral from a daylight appearance to actinic. It is a very powerful manipulation akin to changing the program of an LED fixture, but all done to a still image.
黑点调整会影响图像中最黑暗的斑点的黑暗。有些图片的外观被洗净,因为应该是黑色的图像部分表示为灰色。结果是朦胧的图像。通过设置黑点,这些区域变成了深黑色,这使整个图像变得更加“对比”。
Saturation is an adjustment that affects the vibrancy of the color in the image. If there’s a single adjustment that photographers in this industry abuse above all others, it is saturation. One can imagine that saturation is like a volume dial for color. By turning it up, it is possible to get a hyper-colorful image out of an otherwise pedestrian-looking photo.
一个明显的迹象表明,图像已经过饱和的是没有细节的大斑点,只有一个涂料。当今的摄像机能够解决令人难以置信的细节,因此,对于图像,几乎完全缺乏细节应该显得不寻常。
A powerful tool when used appropriately
总之,后处理是一种强大的工具,也是摄影的组成部分。像每个强大的工具一样,它很容易滥用,因此重要的是要注意何时发生并相应地调整期望。
Photo and video credit: Than Thein