iOS：Photoshop中CIFilter（Hue）的值 [英] iOS: Values for CIFilter (Hue) from Photoshop

问题描述

我使用 Hue 过滤器来更改图片的色调：

I am using the Hue filter to change the hue of an image:

CIFilter* hueFilter = 
     [CIFilter filterWithName:@"CIHueAdjust" <blah blah> 
        [NSNumber numberWithFloat:hue], nil];

我有 Hue 我想要的号码使用 Photoshop ，但它与我从iOS获得的结果不一致。

I have the Hue number I wish to use from Photoshop, but it doesn't correspond to the results I get from iOS.

是否有规则将 PhotoShop 中的数字更改为我应该在 iOS 中使用的数字？

Is there a rule to change the number in PhotoShop to the number I should use in iOS?

推荐答案

HSL / HSV颜色模式中的色调是角度坐标。
在Photoshop中，它以度（-180到+180）给出。

The Hue in HSL/HSV color mode is an angular coordinate. In Photoshop, it is given in degrees (-180 to +180).

在CIHueAdjust过滤器中，角度以弧度给出。
来自 http://developer.apple.com/library/ios/#documentation/graphicsimaging/Reference/CoreImageFilterReference/Reference/reference.html#//apple_ref/doc/filter/ci/CIHueAdjust

In the CIHueAdjust filter, the angle is given in radians. From http://developer.apple.com/library/ios/#documentation/graphicsimaging/Reference/CoreImageFilterReference/Reference/reference.html#//apple_ref/doc/filter/ci/CIHueAdjust

参数

inputAngle

一个 NSNumber 类，其属性类型为 CIAttributeTypeAngle ，其显示名称为Angle。

An NSNumber class whose attribute type is CIAttributeTypeAngle and whose display name is Angle.

默认值：0.00最小值：0.00最大值：0.00最小滑块：-3.14最大滑块：3.14标识：0.00

Default value: 0.00 Minimum: 0.00 Maximum: 0.00 Slider minimum: -3.14 Slider maximum: 3.14 Identity: 0.00

从Photoshop值（度）到CIHueAdjust值（弧度）的公式是线性转换：

The formula to go from Photoshop value (degrees) to CIHueAdjust value (radians) is a linear conversion:

filterAngle = photoshopAngle * π / 180

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