如何弄清楚“特定像素的颜色”。在图像？ [英] How to figure out "Color of a specific pixel" in an image?

问题描述

我的图像位于图像视图中。我想在图像中找到特定像素的颜色（比如x = 10，y = 20）。工作代码真的可以帮助我。

I have an image which is inside an Image View. I want to find the color of a specific pixel (say x=10, y=20) inside the image. Working code would really help me out.

推荐答案

这在很大程度上取决于图像的类型：）

That depends very much on the type of image :)

如果您有字节数据，并且知道它是如何排列的，例如 PNG 使用 RGBA ，然后你就开始了。

If you have the byte data, and you know how it is arranged, for example PNG uses RGBA then you've got a leg up.

自由使用所有 CGImageFunctions 将成为您的向导。

Liberal use of all the CGImageFunctions like CGImageGetBitsPerComponent and CGImageGetColorSpace will be your guide.

要获取实际的字节数据， CGIm ageDestinationCreateWithData 创建一个写入Core Foundation可变数据对象的图像目标（NSMutableData * / CFMutableDataRef）

To get the actual byte data, CGImageDestinationCreateWithData Creates an image destination that writes to a Core Foundation mutable data object (NSMutableData* / CFMutableDataRef)

如果所有这些都是乱码，请从< a href =http://developer.apple.com/mac/library/documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_data_mgr/dq_data_mgr.html#//apple_ref/doc/uid/TP30001066-CH216-BAJGAIEE =nofollow noreferrer> Quart2D编程指南。

If all of this is gibberish, start with the Quart2D Programming Guide.

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