在C#中的图像色调修改 [英] Image hue modification in C#
问题描述
我有一个形象,我想修改特定的图像,以特定值的色调。
我知道RGB到HSL和HSL到RGB转换的数学公式,但我不能够实现这个东西到C#
I have an image and i want to modify the hue of that particular image to specific value. I know rgb to hsl and hsl to rgb conversion mathematical formula but I am not being able to implement this thing into c#.
以下是伪
for(x=0;x<image_width;x++)
{
for(y=0;y<image_height;y++)
{
Color oldColor=GetColorFromPixel(x,y);
Color newColor=ModifyHue(oldColor);
SetColorPixel(x,y,newColor);
}
}
感谢
Thanks
推荐答案
由于这样的事实,即的 颜色
结构已经拥有了的 GetHue()
,的 GetSaturation()
和的 GetBrightness()
它会是不错的构造也从这些值的颜色。所以,我发现下面的代码某处网前一段时间(目前无法再次找到它,但它是从微软的家伙博客,他也有一个测试,通过所有的 KnownColor
)。
Due to the fact, that the Color
structure already has a GetHue()
, GetSaturation()
and GetBrightness()
it would be nice to also construct a color from these values. So i found the following code somewhere on the net a while ago (currently can't find it again, but it was from a Microsoft guy blog and he also had a test that steps through all KnownColor
).
/// <summary>
/// Creates a Color from alpha, hue, saturation and brightness.
/// </summary>
/// <param name="alpha">The alpha channel value.</param>
/// <param name="hue">The hue value.</param>
/// <param name="saturation">The saturation value.</param>
/// <param name="brightness">The brightness value.</param>
/// <returns>A Color with the given values.</returns>
public static Color FromAhsb(int alpha, float hue, float saturation, float brightness)
{
if (0 > alpha || 255 < alpha)
{
throw new ArgumentOutOfRangeException("alpha", alpha,
"Value must be within a range of 0 - 255.");
}
if (0f > hue || 360f < hue)
{
throw new ArgumentOutOfRangeException("hue", hue,
"Value must be within a range of 0 - 360.");
}
if (0f > saturation || 1f < saturation)
{
throw new ArgumentOutOfRangeException("saturation", saturation,
"Value must be within a range of 0 - 1.");
}
if (0f > brightness || 1f < brightness)
{
throw new ArgumentOutOfRangeException("brightness", brightness,
"Value must be within a range of 0 - 1.");
}
if (0 == saturation)
{
return Color.FromArgb(alpha, Convert.ToInt32(brightness * 255),
Convert.ToInt32(brightness * 255), Convert.ToInt32(brightness * 255));
}
float fMax, fMid, fMin;
int iSextant, iMax, iMid, iMin;
if (0.5 < brightness)
{
fMax = brightness - (brightness * saturation) + saturation;
fMin = brightness + (brightness * saturation) - saturation;
}
else
{
fMax = brightness + (brightness * saturation);
fMin = brightness - (brightness * saturation);
}
iSextant = (int)Math.Floor(hue / 60f);
if (300f <= hue)
{
hue -= 360f;
}
hue /= 60f;
hue -= 2f * (float)Math.Floor(((iSextant + 1f) % 6f) / 2f);
if (0 == iSextant % 2)
{
fMid = hue * (fMax - fMin) + fMin;
}
else
{
fMid = fMin - hue * (fMax - fMin);
}
iMax = Convert.ToInt32(fMax * 255);
iMid = Convert.ToInt32(fMid * 255);
iMin = Convert.ToInt32(fMin * 255);
switch (iSextant)
{
case 1:
return Color.FromArgb(alpha, iMid, iMax, iMin);
case 2:
return Color.FromArgb(alpha, iMin, iMax, iMid);
case 3:
return Color.FromArgb(alpha, iMin, iMid, iMax);
case 4:
return Color.FromArgb(alpha, iMid, iMin, iMax);
case 5:
return Color.FromArgb(alpha, iMax, iMin, iMid);
default:
return Color.FromArgb(alpha, iMax, iMid, iMin);
}
}
通过此功能,您能在HSB内工作(或HSV)色彩呈现的不可以的HSL演示文稿中。有关他们之间的分歧进一步信息看看这个维基百科文章。
With this function you are able to work within the HSB (or HSV) color presentation not within the HSL presentation. For further informations about their differences take a look at this wikipedia article.
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