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如何在iPhone上调整UIImage的RGB像素数据？

[英]How can I adjust the RGB pixel data of a UIImage on the iPhone?

原文 2009-06-23 03:42:05 0 1 iphone/ uiimage/ pixels

I want to be able to take a UIImage instance, modify some of its pixel data, and get back a new UIImage instance with that pixel data. 我希望能够获取一个UIImage实例，修改其某些像素数据，并使用该像素数据重新获得一个新的UIImage实例。 I've made some progress with this, but when I try to change the array returned by CGBitmapContextGetData, the end result is always an overlay of vertical blue lines over the image. 我已经取得了一些进展，但是当我尝试更改CGBitmapContextGetData返回的数组时，最终结果始终是图像上垂直蓝线的叠加。 I want to be able to change the colors and alpha values of pixels within the image. 我希望能够更改图像中像素的颜色和alpha值。

Can someone provide an end-to-end example of how to do this, starting with a UIImage and ending with a new UIImage with modified pixels? 有人可以提供一个如何做到这一点的端到端示例，以UIImage开头并以像素已修改的新UIImage结尾吗？

1 个解决方案

This might answer your question: How to get the RGB values for a pixel on an image on the iphone 这可能会回答您的问题：如何在iPhone上获取图像上像素的RGB值

I guess you'd follow those instructions to get a copy of the data, modify it, and then create a new CGDataProvider (CGDataProviderCreateWithCFData), use that to create a new CGImage (CGImageCreate) and then create a new UIImage from that. 我想您会按照这些说明来获取数据的副本，对其进行修改，然后创建一个新的CGDataProvider（CGDataProviderCreateWithCFData），使用它来创建一个新的CGImage（CGImageCreate），然后从中创建一个新的UIImage。

I haven't actually tried this (no access to a Mac at the moment), though. 我实际上还没有尝试过（目前无法访问Mac）。