luminance

How to convert HSL (hue, saturation, lightness) to HSLum (hue, saturation, luminance) and HSLum/RGB?

由 时光毁灭记忆、已成空白 提交于 2021-02-07 09:15:23
问题 I want to convert some color values from well know HSL to less known HSLum how to do it? hsl(0, 1.0, 0.5) - rgb red is hslum(0, 1.0., 0.54) hsl(120, 1.0, 0.5 - rgb green is hslum(0, 1.0, 0.80) hsl(240, 1.0, 0.5) - rgb blue is hslum(0, 1.0, 0.44) As far as I know luminance (not lightness) is calculate in such way: Y = 0.2126 * R + 0.7152 * G + 0.0722 * B I read some articles: Luminance (relative), 21296247, HSL and HSV, luma, Lightness, Munsell but not found solution? As far I know CIELab 1976

How to convert HSL (hue, saturation, lightness) to HSLum (hue, saturation, luminance) and HSLum/RGB?

由 巧了我就是萌 提交于 2021-02-07 09:15:06
问题 I want to convert some color values from well know HSL to less known HSLum how to do it? hsl(0, 1.0, 0.5) - rgb red is hslum(0, 1.0., 0.54) hsl(120, 1.0, 0.5 - rgb green is hslum(0, 1.0, 0.80) hsl(240, 1.0, 0.5) - rgb blue is hslum(0, 1.0, 0.44) As far as I know luminance (not lightness) is calculate in such way: Y = 0.2126 * R + 0.7152 * G + 0.0722 * B I read some articles: Luminance (relative), 21296247, HSL and HSV, luma, Lightness, Munsell but not found solution? As far I know CIELab 1976

How to determine luminance %?

由 心已入冬 提交于 2019-12-31 00:58:09
问题 According to http://www.workwithcolor.com/color-luminance-2233.htm, RED (#FF0000) has Luminance: 54%. and light pink (#FF8080) has Luminance: 89%. Our designers like it but how is it determined? Try here: http://www.workwithcolor.com/hsl-color-schemer-01.htm I tried using relative luminance formula published by W3C and although the range is [0,1], red is 0.21 and white is 1.00 . I'm thinking, maybe what workwithcolor does is first covert the color into grayscale, and read the luminance of the

Luminance Matching Two Colors

由 狂风中的少年 提交于 2019-12-21 20:52:57
问题 This will likely seem like a very easy thing I'm trying to do but Google search has not turned up exactly what I'm looking for and I'd like to do this correctly. Essentially I need to luminance match two bmps. They are simple circles (125x125 pixels) and their original color is only know to me by their (0-255 ranged) RGB value of 255,0,0. I need to find an RGB value of gray that is the same luminance of these circles. All other luminance/brightness matching tutorials I have seen have been for

Image processing: luminance weighted

由 随声附和 提交于 2019-12-11 12:23:32
问题 I would like to weigh values of luminance. Example: I have a vector of luminance values: vector <int> lum {50,100,150,200,250); I have a vector of coefficients: vector <float> coef {5.1 , 2.55 , 1.7 , 1.275, 1.02 } I create an empty image: Mat1 m(15): So, my first value of luminance is 50 (lum[0]=50) and I want it to be applied on the 5.1 (coef[0]=5.1) first pixel of my matrix. To do that, I need to weight the 6th pixel with the first and the second value of luminance. In my case, the

Equalizing luminance, brightness and contrast for a set of images

由 前提是你 提交于 2019-12-10 20:33:30
问题 I use MATLAB for a series of experiments where each eye gets stimulated with a different motiv from the images (binocular rivalry), like on the one is a bottle, on the other a watch. There is a Toolbox to adjust the luminance and spatial frequency (Shine toolbox), but that does not work for images where the background is simply transparent, like .png/.tif/.bmp etc. Moreover, the background which shall stay transparent gets included in the analysis and matching routine so that the objects in

Luminance Matching Two Colors

由 人盡茶涼 提交于 2019-12-04 13:05:22
This will likely seem like a very easy thing I'm trying to do but Google search has not turned up exactly what I'm looking for and I'd like to do this correctly. Essentially I need to luminance match two bmps. They are simple circles (125x125 pixels) and their original color is only know to me by their (0-255 ranged) RGB value of 255,0,0. I need to find an RGB value of gray that is the same luminance of these circles. All other luminance/brightness matching tutorials I have seen have been for pictures that have included, a variety of hues, brightnesses, etc. and I am not sure if those

How to determine luminance %?

由 a 夏天 提交于 2019-12-01 18:23:24
According to http://www.workwithcolor.com/color-luminance-2233.htm , RED (#FF0000) has Luminance: 54%. and light pink (#FF8080) has Luminance: 89%. Our designers like it but how is it determined? Try here: http://www.workwithcolor.com/hsl-color-schemer-01.htm I tried using relative luminance formula published by W3C and although the range is [0,1], red is 0.21 and white is 1.00 . I'm thinking, maybe what workwithcolor does is first covert the color into grayscale, and read the luminance of the gray. I tried it but it still doesn't give the same result. I've tried so far : http://jsfiddle.net

Luminosity from iOS camera

由 末鹿安然 提交于 2019-12-01 12:08:40
I'm trying to make an application and i have to calculate the brightness of the camera like this application : http://itunes.apple.com/us/app/megaman-luxmeter/id455660266?mt=8 I found this document : http://b2cloud.com.au/tutorial/obtaining-luminosity-from-an-ios-camera But i don't know how to adapt it to the camera directly and not an image. Here is my code : Image = [[UIImagePickerController alloc] init]; Image.delegate = self; Image.sourceType = UIImagePickerControllerCameraCaptureModeVideo; Image.showsCameraControls = NO; [Image setWantsFullScreenLayout:YES]; Image.view.bounds = CGRectMake

Luminosity from iOS camera

由 僤鯓⒐⒋嵵緔 提交于 2019-12-01 11:15:30
问题 I'm trying to make an application and i have to calculate the brightness of the camera like this application : http://itunes.apple.com/us/app/megaman-luxmeter/id455660266?mt=8 I found this document : http://b2cloud.com.au/tutorial/obtaining-luminosity-from-an-ios-camera But i don't know how to adapt it to the camera directly and not an image. Here is my code : Image = [[UIImagePickerController alloc] init]; Image.delegate = self; Image.sourceType =
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