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Honest – Email Customer

Honest – Email Customer


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Javascript canvas inverse filter to transparency

I’m trying to make a logo that has transparency at the bottom. The canvas element doesn’t fully support this. I have a mask that draws the logo onto a canvas, now I want to apply an inverse blur to the canvas so that transparent pixels become black and opaque pixels become white. The problem is that when I apply my inverse filter, even the transparent pixels appear white. How do I fix this?
var canvas = document.getElementById(“canvas”);
var ctx = canvas.getContext(“2d”);

function drawLogo(){
ctx.drawImage(img, 0,0,400,100);

function blur() {
ctx.globalCompositeOperation = “difference”;
ctx.globalAlpha =.9;
ctx.globalCompositeOperation = “source-over”;
ctx.fillStyle = “black”;
ctx.clearRect(0,0,ctx.canvas.width, ctx.canvas.height);

// Create a canvas element
var c = document.createElement(“canvas”);
c.width = 400;
c.height = 50;

// Create a two-dimensional context
ctx = c.getContext(“2d”);



You can’t have a grayscale source when applying a difference blend mode.
But you can have a grayscale image as the source of a mask and then use a blend mode that can combine a grayscale source with a transparent one (add). For example,
ctx.globalAlpha =.9;
ctx.globalCompositeOperation = ‘add’;
ctx.fillStyle = “black”;

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