hsv

From RGB to HSV in OpenGL GLSL

I am the author of the second implementation. It has always behaved correctly for me, but you wrote 2.9 / 6.9 instead of 2.0 / 6.0. Since you target GLSL, you should use conversion routines that are written with the GPU in mind: // All components are in the range [0…1], including hue. vec3 rgb2hsv(vec3 … Read more

Tracking white color using python opencv

Let’s take a look at HSV color space: You need white, which is close to the center and rather high. Start with sensitivity = 15 lower_white = np.array([0,0,255-sensitivity]) upper_white = np.array([255,sensitivity,255]) and then adjust the threshold to your needs. You might also consider using HSL color space, which stands for Hue, Saturation, Lightness. Then you … Read more

HSV to RGB Color Conversion

That function expects decimal for s (saturation) and v (value), not percent. Divide by 100. >>> import colorsys # Using percent, incorrect >>> test_color = colorsys.hsv_to_rgb(359,100,100) >>> test_color (100, -9900.0, -9900.0) # Using decimal, correct >>> test_color = colorsys.hsv_to_rgb(1,1,1) >>> test_color (1, 0.0, 0.0) If you would like the non-normalized RGB tuple, here is a … Read more

Finding red color in image using Python & OpenCV

I would just add the masks together, and use np.where to mask the original image. img=cv2.imread(“img.bmp”) img_hsv=cv2.cvtColor(img, cv2.COLOR_BGR2HSV) # lower mask (0-10) lower_red = np.array([0,50,50]) upper_red = np.array([10,255,255]) mask0 = cv2.inRange(img_hsv, lower_red, upper_red) # upper mask (170-180) lower_red = np.array([170,50,50]) upper_red = np.array([180,255,255]) mask1 = cv2.inRange(img_hsv, lower_red, upper_red) # join my masks mask = mask0+mask1 … Read more

RGB to HSV in PHP

Here is a simple, straightforward method that returns HSV values as degrees and percentages, which is what Photoshop’s color picker uses. Note that the return values are not rounded, you can do that yourself if required. Keep in mind that H(360) == H(0), so H values of 359.5 and greater should round to 0 Heavily … Read more

How to Convert RGB Color to HSV?

Note that Color.GetSaturation() and Color.GetBrightness() return HSL values, not HSV. The following code demonstrates the difference. Color original = Color.FromArgb(50, 120, 200); // original = {Name=ff3278c8, ARGB=(255, 50, 120, 200)} double hue; double saturation; double value; ColorToHSV(original, out hue, out saturation, out value); // hue = 212.0 // saturation = 0.75 // value = 0.78431372549019607 … Read more