gradient

How to create colour gradient in Python?

由 随声附和 提交于 2019-11-28 16:20:08
问题 I want to create a new colormap which interpolates between green and blue (or any other two colours for that matter). My goal is to get something like: First of all I am really not sure if this can be done using linear interpolation of blue and green. If it can, I'm not sure how to do so, I found some documentation on using a matplotlib method that interpolates specified RGB values here The real trouble is understanding how "cdict2" works below. For the example the documentation says:

Pytorch, what are the gradient arguments

由 馋奶兔 提交于 2019-11-28 14:42:47
问题 I am reading through the documentation of PyTorch and found an example where they write gradients = torch.FloatTensor([0.1, 1.0, 0.0001]) y.backward(gradients) print(x.grad) where x was an initial variable, from which y was constructed (a 3-vector). The question is, what are the 0.1, 1.0 and 0.0001 arguments of the gradients tensor ? The documentation is not very clear on that. 回答1: The original code I haven't found on PyTorch website anymore. gradients = torch.FloatTensor([0.1, 1.0, 0.0001])

Matlab gradient equivalent in opencv

由 大城市里の小女人 提交于 2019-11-28 12:59:16
I am trying to migrate some code from Matlab to Opencv and need an exact replica of the gradient function. I have tried the cv::Sobel function but for some reason the values in the resulting cv::Mat are not the same as the values in the Matlab version. I need the X and Y gradient in separate matrices for further calculations. Any workaround that could achieve this would be great Pei Guo Sobel can only compute the second derivative of the image pixel which is not what we want. (f(i+1,j) + f(i-1,j) - 2f(i,j)) / 2 What we want is (f(i+i,j)-f(i-1,j)) / 2 So we need to apply Mat kernelx = (Mat_

The OnPaintBackground method is never invoked for control derived from Button

由 不打扰是莪最后的温柔 提交于 2019-11-28 10:43:50
问题 I've made a class GradientButton which suppose to be a Button which is filled with gradient background. I draw gradient filling in the OnPaintBackground() method. Unfortunately it is never invoked, of course I added a GradientButton to a Form via toolbox: public class GradientButton : Button { public Color Color1 { get; set; } public Color Color2 { get; set; } public float Angle { get; set; } public GradientButton() { Color1 = Color.YellowGreen; Color2 = Color.LightGreen; Angle = 30; }

Is there a -moz-mask CSS property, like -webkit-mask-image?

由 我怕爱的太早我们不能终老 提交于 2019-11-28 09:53:25
It seems -moz-mask-image is not supported in Firefox. I am attempting a foreground gradient. I can't use an image as i need the text to be selectable. Does anyone have any ideas for Firefox? This version works in chrome and safari css: -webkit-mask-image: -webkit-gradient(linear, left bottom, left top, color-stop(0.16, rgba(0,0,0,0)), color-stop(0.52, rgba(0,0,0,.5)), color-stop(0.77, rgba(0,0,0,1))); -moz-mask: -moz-gradient(linear, left bottom, left top, color-stop(0.16, rgba(0,0,0,0)), color-stop(0.52, rgba(0,0,0,.5)), color-stop(0.77, rgba(0,0,0,1))); Paul D. Waite According to MDN, you

SVG angular gradient

由 吃可爱长大的小学妹 提交于 2019-11-28 09:45:13
Is there a way to do an 'angular gradient' in SVG? (I don't know the official term -- it's the kind of gradient you see in color-pickers, where it varies by angle.) SVG seems to support only linear and radial gradients, but I'm thinking there might be some way to use a transform to simulate what I want. thanks! kennytm There's no standard support to do angular (conical) gradients. But see http://wiki.inkscape.org/wiki/index.php/Advanced_Gradients#Conical_gradient for some approximation methods (source code not included, though). Examples on that link do not work. Paul LeBeau In my answer to

SVG: why does external css override inline style for text?

由 一笑奈何 提交于 2019-11-28 08:58:33
I'm playing with using an SVG gradientFill as a way to visually 'truncate' long text strings in a d3.js chart. It seems that an external css style for fill will override the inline gradient fill style in the SVG... is that always the case? How can I enforce that gradient fill? In this test case I've defined a linear gradient in the svg defs, and then apply the gradient fill to two groups of text. http://jsfiddle.net/rolfsf/uX2kH/3/ var labelColWidth = 200; var svg = d3.select('#test').append('svg') .attr('width', 500) .attr('height', 500); var defs = svg.append('svg:defs'); var textgradient =

How can I prevent CSS gradient banding?

由 孤者浪人 提交于 2019-11-28 08:02:06
I started using CSS gradients, rather than actual images, for two reasons: first, the CSS gradient definitely loads faster than an image, and second, they aren't supposed to show banding, like so many raster graphics. I started testing my site on various screens recently, and on larger ones (24+ inches), the CSS linear gradient which constitutes my site's background shows very visible banding. As a provisional fix, I've overlaid the gradient with a small, repeating, transparent PNG image of noise, which helps a little. Is there any other way to fix this banding issue? I know you won't like the

Animating Linear Gradient using CSS

由 微笑、不失礼 提交于 2019-11-28 07:53:22
问题 I want to move my gradient that has multiple colors smoothly but the problem is that the animation is not smooth it just changes its position at every step. here is <style> .animated { width:300px; height:300px; border:1px solid black; animation:gra 5s infinite; animation-direction:reverse; -webkit-animation:gra 5s infinite; -webkit-animation-direction:reverse; animation-timing-function:linear; -webkit-animation-timing-function:linear; } @keyframes gra { 0% { background: -webkit-gradient

Alpha-gradient on Android

由 房东的猫 提交于 2019-11-28 06:54:25
I need to create an alpha-gradient on the edge of the ImageView. Preferably using only XML. Image for example Here the solution the image look like below picture code for that : Prepare shape drawable res/drawable/gradient_shape.xml: <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <gradient android:startColor="#00FFFFFF" android:endColor="#FFFFFFFF" android:type="linear" /> </shape> Define layout: activity_main.xml: <ImageView android:id="@+id/photo" android:layout_width="match_parent" android:layout_height="match_parent" android
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