gradient | 易学教程

Color interpolation between 3 colors

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I use the following equation to get a nice color gradient from colorA to colorB, but I have no idea how to do the same for 3 colors, so the gradient goes from colorA to colorB to colorC colorT = colorA * p + colorB * (1.0 - p); where "p" is the a percentage from 0.0 to 1.0 Thanks Well, for 3 colors, you can just to the same with p = 0.0 to 2.0: if p <= 1.0 colorT = colorA * p + colorB * (1.0 - p); else colorT = colorB * (p - 1.0) + colorC * (2.0 - p); Or scale it so you can still use p = 0.0 to 1.0: if p <= 0.5 colorT = colorA * p * 2.0 + colorB * (0.5 - p) * 2.0; else colorT = colorB * (p - 0

Official ZeroOut gradient example error: AttributeError: 'list' object has no attribute 'eval'

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问题 I followed the official tutorial of the tensorflow website: https://www.tensorflow.org/extend/adding_an_op There is also described how to call the gradient of the example ZeroOut in the tutorial that I want to try in this short code snippet underneath. I have found the code here: https://github.com/MatteoRagni/tf.ZeroOut.gpu import numpy as np import tensorflow as tf from tensorflow.python.framework import ops from tensorflow.python.ops import array_ops from tensorflow.python.ops import

OpenCV: how to apply rainbow gradient map on an image?

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Say we had an image we somehow modified via openCV: And now we would love to apply to it Gradient Map (like one we can apply via photoshop) : So I wonder how to apply gradient map (rainbow colors) via openCV? Here is a method to create false/pseudo-color images using Python, conversion to c++ should be very straightforward. Overview: Open your image as grayscale, and RGB Convert the RGB image to HSV (Hue, Saturation, Value/Brightness) color space. This is a cylindrical space, with hue represented by a single value on the polar axis. Set the hue channel to the grayscale image we already opened,

Defining XML Parent Style of Gradient / Shape / Corners

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How can I define an easily reusable base shape (or gradient, or corners) in XML? I have a dozen or so drawable gradients that will be the same other than the start and end colors. I was hoping to define the identical stuff somewhere else and have an XML file for each different gradient that only defined the start and end colors. Is that possible? This is the base: <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <gradient xmlns:android="http://schemas.android.com/apk/res/android" android:type="linear" android

Compile error trying to use CAGradientLayer

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I'm trying to use CAGradientLayer and getting an unhelpful compile error. Can't figure out whats wrong. All I'm doing so far is: CAGradientLayer *gradient = [CAGradientLayer layer]; I've imported <QuartzCore/QuartzCore.h> and I'm getting the warning > _OBJC_CLASS_$CAGradientLayer referenced from: objc-class-ref-to-CAGradientLayer symbol(s) not found. I've tried clean and build but no luck and I can't seem to target anything other than 4.1 in Xcode Cheers for any help. You didn't correctly add the QuartzCore framework into your project: You have to add the QuartzCore-Framework to your project.

Programmatically create textview background from drawable in Android

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问题 I have to set the background programmatically on Android TextView I have using below code. it's not working and also its gave me nullpointerexception error. best_deals = (TextView) findViewById(R.id.bestdeals); best_deals.setBackground(getResources().getDrawable( R.drawable.headerradius)); but I have to put these best_deals.setTextColor(Color.parseColor("#be2351")); means it's working what's wrong in above code? This is my header_redius.xml : <shape xmlns:android="http://schemas.android.com

Gradient alpha fade out effect with CSS 3

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I would like to know if it would be possible to replicate the effect like the bottom of the Top Tweets list with pure CSS? http://www.twitter.com derekerdmann Yes you can! Taking advantage of RGBa colors and CSS3 gradients, we can apply the following styles to an element and have a fading semi-transparent background: Mozilla: background: -moz-linear-gradient(top, rgba(255,255,255,0), rgba(255,255,255, 1)); Webkit: background: -webkit-linear-gradient(top, rgba(255,255,255,0), rgba(255,255,255, 1)); (Updated after changes to Webkit gradients) Sadly, this only works in Firefox 3.6+, Safari, and

How to create gradient object with Raphael

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I was trying to use Raphael JS graphics library. I would like to use the attribute gradient which should accept an object. Documentation says to refer to SVG specs. I found the gradient object in SVG, for instance <linearGradient id="myFillGrad" x1="0%" y1="100%" x2="100%" y2="0%"> <stop offset="5%" stop-color="red" /> <stop offset="95%" stop-color="blue" stop-opacity="0.5" /> </linearGradient> but how can I reference that from within my javascript? circle.attr("gradient", "myFillGrad"); doesn't work :) Thanks in advance UPDATE: Rewritten for the latest Raphael API: <!DOCTYPE html PUBLIC "-/

CSS3 Gradients to reproduce an 'inner glow' effect from Illustrator with border-radius applied

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I am in the process of trying to get my head properly around CSS3 Gradients (specifically radial ones) and in doing so I think I've set myself a relatively tough challenge. In Adobe Illustrator I have created the following 'button' style. To create this image I created a rectangle with a background colour of rgb(63,64,63) or #3F403F , then 'stylized' it to have a 15px border radius. I then applied an 'inner glow' to it with a 25% opacity, 8px blur, white from the center. Finally, I applied a 3pt white stroke on it. (I'm telling you all of this in case you wished to reproduce it, if the image

How to implement alpha gradient on a image?

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问题 I want to implement alpha gradient on an image. From 0.5 alfa on top of the image to 0.0 on bottom. Any advice, tutorial, link is welcome. 回答1: You can use CGImageCreateWithMask to apply a masking image to it. You could generate an appropriate mask simply enough by drawing to a greyscale or alpha-only CGBitmapContext with CGContextDrawLinearGradient . If it's being displayed as the content of a CALayer, you could apply an appropriate masking layer to the parent layer's mask property. You