cielab

CIELAB color range for Scikit-image?

由 与世无争的帅哥 提交于 2020-05-14 22:30:41
问题 I am working on CIELAB colour space but cannot find any information about the range of each channel produced by skimage.color.rgb2lab . Thanks. 回答1: Just would like to post the answer from @Stefan L: 0 to 100, a: -127 to 128, b: -128 to 127. 回答2: Quote from wiki, https://en.wikipedia.org/wiki/CIELAB_color_space The scaling and limits of the a* and b* axes will depend on the specific implementation, as described below, but they often run in the range of ±100 or −128 to +127 (signed 8-bit

CIELAB color range for Scikit-image?

由 假装没事ソ 提交于 2020-05-14 22:29:10
问题 I am working on CIELAB colour space but cannot find any information about the range of each channel produced by skimage.color.rgb2lab . Thanks. 回答1: Just would like to post the answer from @Stefan L: 0 to 100, a: -127 to 128, b: -128 to 127. 回答2: Quote from wiki, https://en.wikipedia.org/wiki/CIELAB_color_space The scaling and limits of the a* and b* axes will depend on the specific implementation, as described below, but they often run in the range of ±100 or −128 to +127 (signed 8-bit

RGB / XYZ and XYZ-LAB color space conversion algorithm

由 試著忘記壹切 提交于 2020-01-24 23:57:08
问题 I tried to convert RGB color space to CIE-LAB color space. But there is a mistake. input RGB values = (50,125,50) received result LAB vaues = (41,-38,34) LAB values should be (46.41,-39.24,33.51) I checked this values from http://colorizer.org/ Where did I make a mistake? If you check the following code and answer me. I will be glad. Thanks. public static Vector4 RGBToLab(Vector4 color) { float[] xyz = new float[3]; float[] lab = new float[3]; float[] rgb = new float[] { color[0], color[1],

How is the visible gamut bounded?

由 白昼怎懂夜的黑 提交于 2019-12-19 11:53:22
问题 Tho coordinates of a color in CIE XYZ space represent the stimulation of one each of the cone types in our eyes – hence tristimulus values . Not all coordinates (x, y, z) make sense (for example you can't have negative stimulation in any of the cones), so the domain of all possible combinations in XYZ space will be a blob. Sometimes you'll find that blob depicted, for example on Wikipedia: (The colors on the blob are rather meaningless since they cannot actually be displayed on a standard RGB

What are the ranges of coordinates in the CIELAB color space?

由 ￡可爱￡侵袭症＋ 提交于 2019-11-30 12:04:51
问题 I have the following piece of code: public List<Tuple<double, double, double>> GetNormalizedPixels(Bitmap image) { System.Drawing.Imaging.BitmapData data = image.LockBits( new Rectangle(0, 0, image.Width, image.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, image.PixelFormat); int pixelSize = Image.GetPixelFormatSize(image.PixelFormat) / 8; var result = new List<Tuple<double, double, double>>(); unsafe { for (int y = 0; y < data.Height; ++y) { byte* row = (byte*)data.Scan0 + (y *

What are the ranges of coordinates in the CIELAB color space?

由 折月煮酒 提交于 2019-11-30 01:58:38
I have the following piece of code: public List<Tuple<double, double, double>> GetNormalizedPixels(Bitmap image) { System.Drawing.Imaging.BitmapData data = image.LockBits( new Rectangle(0, 0, image.Width, image.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, image.PixelFormat); int pixelSize = Image.GetPixelFormatSize(image.PixelFormat) / 8; var result = new List<Tuple<double, double, double>>(); unsafe { for (int y = 0; y < data.Height; ++y) { byte* row = (byte*)data.Scan0 + (y * data.Stride); for (int x = 0; x < data.Width; ++x) { Color c = Color.FromArgb( row[x * pixelSize + 3], row
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