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由于上周我尝试使用Windows颜色系统进行颜色转换。通过从CMYK转换为RGB我得到正确的值:色彩转换CMYK - RGB - 通过使用ICC配置文件的WCS实验室
// Example CMYK - VALUES with 0
float[] cmykValues = new float[4];
cmykValues[0] = 0f/255f;
cmykValues[1] = 0f/255f;
cmykValues[2] = 0f/255f;
cmykValues[3] = 0f/255f;
System.Windows.Media.Color color = Color.FromValues(cmykValues, new Uri(@"ISOcoated_v2_300_eci.icc"));
System.Drawing.Color rgbColor = System.Drawing.Color.FromArgb(color.R, color.G, color.B);
当我尝试将RGB值转换为Lab值,然后我得到一个不正确实验室 - 结果:
[StructLayout(LayoutKind.Sequential)]
public struct RGBColor
{
public ushort red;
public ushort green;
public ushort blue;
public ushort pad;
};
[StructLayout(LayoutKind.Sequential)]
public struct LABColor
{
public ushort L;
public ushort a;
public ushort b;
public ushort pad;
};
StringBuilder profileName = new StringBuilder(256);
uint size = (uint)profileName.Capacity * 2;
success = GetStandardColorSpaceProfile(0, LogicalColorSpace.sRGB, profileName, ref size);
ProfileFilename sRGBFilename = new ProfileFilename(profileName.ToString());
IntPtr hSRGBProfile = OpenColorProfile(sRGBFilename, ProfileRead, FileShare.Read, CreateDisposition.OpenExisting);
ProfileFilename isoCoatedFilename = new ProfileFilename(@"ISOcoated_v2_300_eci.icc");
IntPtr hIsoCoatedProfile = OpenColorProfile(isoCoatedFilename, ProfileRead, FileShare.Read, CreateDisposition.OpenExisting);
IntPtr[] profiles = new IntPtr[] { hSRGBProfile, hIsoCoatedProfile };
uint[] intents = new uint[] { IntentPerceptual };
IntPtr transform = CreateMultiProfileTransform(profiles, 2, intents, 1, ColorTransformMode.BestMode, IndexDontCare);
RGBColor[] rgbColors = new RGBColor[1];
rgbColors[0] = new RGBColor();
LABColor[] labColors = new LABColor[1];
labColors[0] = new LABColor();
rgbColors[0].red = Convert.ToUInt16(rgbColor.R * 257);
rgbColors[0].green = Convert.ToUInt16(rgbColor.G * 257);
rgbColors[0].blue = Convert.ToUInt16(rgbColor.B * 257);
success = TranslateColors(transform, rgbColors, 1, ColorType.RGB, labColors, ColorType.Lab);
double colorL = Convert.ToDouble(labColors[0].L)/65535;
double colorA = Convert.ToDouble(labColors[0].a)/65535;
double colorB = Convert.ToDouble(labColors[0].b)/65535;
当我转换CMYK值(0; 0; 0; 0)到RGB(= 254:254; 254)和RGB值到Lab我得到以下值:
L = 0.0039978637360036373
a = 0.002777141984552145
b = 0.0030670634005218744
但L值应为约100%
只是有没有足够的信息在这里解决问题。 'TranslateColors'看起来像什么? “GetStandardColorSpaceProfile”怎么样?你最好问一个关于将CMYK转换为LAB的通用问题。 – 2013-03-04 14:24:47
我编辑了你的标题。请参阅:“[应该在其标题中包含”标签“](http://meta.stackexchange.com/questions/19190/)”,其中的共识是“不,他们不应该”。 – 2013-03-04 14:29:06
我不认为颜色配置文件'ISOcoated_v2_300_eci.icc'适用于实验室颜色。它可能只支持CMYK到RGB(反之亦然)转换。您可能需要Lab颜色的特定配置文件。 – Codo 2013-03-04 14:33:57