GPUImage – 调节图像颜色 GPUImageToneCurveFilter

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我是靠谱客的博主奋斗黑裤，这篇文章主要介绍GPUImage – 调节图像颜色 GPUImageToneCurveFilter，现在分享给大家，希望可以做个参考。

一.简介
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一.简介

GPUImage 共 125 个滤镜, 分为四类

1、Color adjustments : 31 filters , 颜色处理相关
2、Image processing : 40 filters , 图像处理相关.
3、Blending modes : 29 filters , 混合模式相关.
4、Visual effects : 25 filters , 视觉效果相关.

GPUImageToneCurveFilter 属于 GPUImage 颜色处理相关，用来处理图片颜色

GPUImageToneCurveFilter 根据每个颜色通道的样条曲线调整图像的颜色。rgbCompositeControlPoints：色调曲线采用一系列控制点，它们定义每个颜色分量的样条曲线，或复合组合中的所有三个样条曲线。这些存储为 NSArray 中的 NSValue 包装的 CGPoint，标准化的 X 和 Y 坐标为 0 – 1。默认值为（0,0），（0.5,0.5），（1,1）。

复制代码

/******************************************************************************************/
//@Author:猿说编程
//@Blog(个人博客地址): www.codersrc.com
//@File:GPUImage – 调节图像颜色 GPUImageToneCurveFilter
//@Time:2022/03/25 07:30
//@Motto:不积跬步无以至千里，不积小流无以成江海，程序人生的精彩需要坚持不懈地积累！
/******************************************************************************************/

#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
NSString *const kGPUImageToneCurveFragmentShaderString = SHADER_STRING
(
 varying highp vec2 textureCoordinate;
 uniform sampler2D inputImageTexture;
 uniform sampler2D toneCurveTexture;

void main()
 {
     lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
     lowp float redCurveValue = texture2D(toneCurveTexture, vec2(textureColor.r, 0.0)).r;
     lowp float greenCurveValue = texture2D(toneCurveTexture, vec2(textureColor.g, 0.0)).g;
     lowp float blueCurveValue = texture2D(toneCurveTexture, vec2(textureColor.b, 0.0)).b;

gl_FragColor = vec4(redCurveValue, greenCurveValue, blueCurveValue, textureColor.a);
 }
);
#else
NSString *const kGPUImageToneCurveFragmentShaderString = SHADER_STRING
(
 varying vec2 textureCoordinate;
 uniform sampler2D inputImageTexture;
 uniform sampler2D toneCurveTexture;

void main()
 {
     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
     float redCurveValue = texture2D(toneCurveTexture, vec2(textureColor.r, 0.0)).r;
     float greenCurveValue = texture2D(toneCurveTexture, vec2(textureColor.g, 0.0)).g;
     float blueCurveValue = texture2D(toneCurveTexture, vec2(textureColor.b, 0.0)).b;

gl_FragColor = vec4(redCurveValue, greenCurveValue, blueCurveValue, textureColor.a);
 }
);
#endif

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/******************************************************************************************/
//@Author:猿说编程
//@Blog(个人博客地址): www.codersrc.com
//@File:GPUImage – 调节图像颜色 GPUImageToneCurveFilter
//@Time:2022/03/25 07:30
//@Motto:不积跬步无以至千里，不积小流无以成江海，程序人生的精彩需要坚持不懈地积累！
/******************************************************************************************/


#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
NSString *const kGPUImageToneCurveFragmentShaderString = SHADER_STRING
(
 varying highp vec2 textureCoordinate;
 uniform sampler2D inputImageTexture;
 uniform sampler2D toneCurveTexture;

 void main()
 {
     lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
     lowp float redCurveValue = texture2D(toneCurveTexture, vec2(textureColor.r, 0.0)).r;
     lowp float greenCurveValue = texture2D(toneCurveTexture, vec2(textureColor.g, 0.0)).g;
     lowp float blueCurveValue = texture2D(toneCurveTexture, vec2(textureColor.b, 0.0)).b;

     gl_FragColor = vec4(redCurveValue, greenCurveValue, blueCurveValue, textureColor.a);
 }
);
#else
NSString *const kGPUImageToneCurveFragmentShaderString = SHADER_STRING
(
 varying vec2 textureCoordinate;
 uniform sampler2D inputImageTexture;
 uniform sampler2D toneCurveTexture;

 void main()
 {
     vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);
     float redCurveValue = texture2D(toneCurveTexture, vec2(textureColor.r, 0.0)).r;
     float greenCurveValue = texture2D(toneCurveTexture, vec2(textureColor.g, 0.0)).g;
     float blueCurveValue = texture2D(toneCurveTexture, vec2(textureColor.b, 0.0)).b;

     gl_FragColor = vec4(redCurveValue, greenCurveValue, blueCurveValue, textureColor.a);
 }
);
#endif