hsb

Convert HSB/HSV color to HSL

Deadly 提交于 2019-11-27 14:46:20
Ho do I convert HSB color to HSL? Photoshop shows HSB color in its color picker. HSL color can be used in CSS. I tried this JS: function hsb2hsl(h, s, b) { return { h: h, s: s, l: b-s/2 } } But hsb2hsl(0, 100, 50).l == 0 instead of 25 Update: Can I do that without converting HSB → RGB → HSL? I'm afraid my Javascript knowledge is lacking, but you should be able to infer the conversion from http://ariya.blogspot.com/2008/07/converting-between-hsl-and-hsv.html Let's picture what actually are H SB (V), H SL , and how are constructed: Hue color value goes from 0 to 360 degrees (where 0 is red ) for

色彩空间RGB/CMYK/HSL/HSB/HSV/Lab/YUV基础理论及转换方法:RGB与YUV

放肆的年华 提交于 2019-11-27 00:23:49
之前做个设计,现在从事IT,脑子里面关于RGB,RGBA,CMY,CMYK,YUV,但是具体理论还是不扎实。若干年前之前写过《 水煮RGB与CMYK色彩模型—色彩与光学相关物理理论浅叙 》《 三色视者与四色视者身后的理论基础:色彩原理 》 光学三原色与印刷三间色 光学的三原色 : 红(Red)、绿(Green)、蓝(Blue) (RGB)。 印刷的三原色 : 青(Cyan)、品红(Magenta)、黄(Yellow) (CMYK) 印刷色是光照射在印刷物上, 然后折射到人眼的光的合成,所以印刷色会比光学暗淡,因为印刷色是经过印刷物过滤过光合成的,自然会比较相对暗淡。 C(100) +M(100) +Y(100) = 黑色(100,100,100) 可见黑色就是青色、品与黄色之和,但是这三种颜色混成的黑色不够纯,所以印刷学就引进了K(Black)黑色,因为B已经被Blue占用,所以黑色就只好用引文字母黑色的最后一个字母K,所以: C(100) +M(100) +Y(100) + K(100) 等价于 C(0) +M(0) + Y(0) + K(100) = 黑色 光学三原色如何得到白色, 配色如下: R(0) + G(0) + B(0)+A(255) = C(0) +M(0) + Y(0) + K(100) = 黑色 联想下,是不是可见黑色就是没有颜色(0,0,0)?

Algorithm to Switch Between RGB and HSB Color Values

旧时模样 提交于 2019-11-26 23:17:22
问题 I read the article Algorithm to Switch Between RGB and HSB Color Values Type RGBColor Red As Byte Green As Byte Blue As Byte End Type Type HSBColor Hue As Double Saturation As Double Brightness As Double End Type Function RGBToHSB(rgb As RGBColor) As HSBColor Dim minRGB, maxRGB, Delta As Double Dim h, s, b As Double h = 0 minRGB = Min(Min(rgb.Red, rgb.Green), rgb.Blue) maxRGB = Max(Max(rgb.Red, rgb.Green), rgb.Blue) Delta = (maxRGB - minRGB) b = maxRGB If (maxRGB <> 0) Then s = 255 * Delta /

Convert HSB/HSV color to HSL

邮差的信 提交于 2019-11-26 16:45:51
问题 Ho do I convert HSB color to HSL? Photoshop shows HSB color in its color picker. HSL color can be used in CSS. I tried this JS: function hsb2hsl(h, s, b) { return { h: h, s: s, l: b-s/2 } } But hsb2hsl(0, 100, 50).l == 0 instead of 25 Update: Can I do that without converting HSB → RGB → HSL? 回答1: I'm afraid my Javascript knowledge is lacking, but you should be able to infer the conversion from http://ariya.blogspot.com/2008/07/converting-between-hsl-and-hsv.html 回答2: Let's picture what

Javascript convert HSB/HSV color to RGB accurately

﹥>﹥吖頭↗ 提交于 2019-11-26 11:20:54
I need to accurately convert HSB to RGB but I am not sure how to get around the problem of turning decimals into whole numbers without rounding. This is the current function I have out of a colorpicker library: HSBToRGB = function (hsb) { var rgb = { }; var h = Math.round(hsb.h); var s = Math.round(hsb.s * 255 / 100); var v = Math.round(hsb.b * 255 / 100); if (s == 0) { rgb.r = rgb.g = rgb.b = v; } else { var t1 = v; var t2 = (255 - s) * v / 255; var t3 = (t1 - t2) * (h % 60) / 60; if (h == 360) h = 0; if (h < 60) { rgb.r = t1; rgb.b = t2; rgb.g = t2 + t3 } else if (h < 120) { rgb.g = t1; rgb

Javascript convert HSB/HSV color to RGB accurately

我只是一个虾纸丫 提交于 2019-11-26 02:21:16
问题 I need to accurately convert HSB to RGB but I am not sure how to get around the problem of turning decimals into whole numbers without rounding. This is the current function I have out of a colorpicker library: HSBToRGB = function (hsb) { var rgb = { }; var h = Math.round(hsb.h); var s = Math.round(hsb.s * 255 / 100); var v = Math.round(hsb.b * 255 / 100); if (s == 0) { rgb.r = rgb.g = rgb.b = v; } else { var t1 = v; var t2 = (255 - s) * v / 255; var t3 = (t1 - t2) * (h % 60) / 60; if (h ==