QC 组合将黑色和白色像素转换为其他两种颜色
我刚刚开始学习 Quartz Composer，我想要创建的第一件事是最终可以在 Cocoa 应用程序中使用的组合，该应用程序将接受黑白图像和两个 NSColor，并将黑色像素更改为 NSColor # 1 和 NSColor #2 的白色像素。
我花了一些时间研究 QC，但似乎无法弄清楚如何将所有部分组合在一起。
我唯一想到的是我需要使用图像过滤器模板，并且我确实看到有一个图像像素补丁可以从图像中获取像素...但是，我没有看到用于设置像素的补丁像素。 Pixellate 补丁似乎也是必要的……不过，我不必担心它会生成无限尺寸的图像，因为我的源图像只是固定大小的 PNG 图像。
I'm just starting to learn about Quartz Composer and the first thing I would like to create is a composition that could eventually be used in a Cocoa application which would accept a black and white image and two NSColor's and change the black pixels to NSColor #1 and the white pixels to NSColor #2.
I've spent some time playing with QC, but cannot seem to figure out how to put all of the pieces together.
About the only thing I have figured out is that I need to use the Image Filter template and I do see there is a Image Pixel patch that can get pixels from an image...however, I don't see a patch to set a pixel. It also seems possible the Pixellate patch might be necessary...although, I shouldn't have to worry about it producing an image with infinite dimensions since my source images will only be fixed size PNG images.
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看一下
False Color补丁 - 它获取图像并用一对颜色重新映射它。事实上，由于
False Color补丁只是具有相同名称 (CIFalseColor) 的 Core Image 过滤器的包装，因此您可以在不涉及 Quartz Composer 的情况下完成此操作 - -- 只需设置一个 CIFilter 实例并将其应用到您的 NSImage 即可。编辑 - 或编写您自己的核心图像过滤器，从以下内容开始：
...它获取输入图像的红色通道的亮度 (
sample(image, samplerCoord(image)).r)，并将其用作colorForDark和colorForLight之间线性插值的系数。Take a look at the
False Colorpatch — it takes an image and remaps it with a pair of colors.In fact, since the
False Colorpatch is just a wrapper around the Core Image filter with the same name (CIFalseColor), you could do this without involving Quartz Composer at all --- just set up and apply aCIFilterinstance to your NSImage.Edit — or write your own Core Image filter, starting with something like this:
...which takes the brightness of the red channel of the input image (
sample(image, samplerCoord(image)).r), and uses it as a coefficient for linear interpolation betweencolorForDarkandcolorForLight.