Revisions to How to check if a specific pixel of an image is transparent?

deleted 22 characters in body

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edited Jul 24, 2022 at 7:16

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With : i << 2

const datapixels = context.getImageData(x, y, width, height).data;
//const pixels = [];

for (let i = 0, dx = 0; dx < data.length; i++, dx = i << 2) 
{
    if (data[dx+3]pixels[dx+3] <= 8) { console.log("transparent x= " + i); }
}

With : i << 2

const data = context.getImageData(x, y, width, height).data;
//const pixels = [];

for (let i = 0, dx = 0; dx < data.length; i++, dx = i << 2) 
{
    if (data[dx+3] <= 8) { console.log("transparent x= " + i); }
}

With : i << 2

const pixels = context.getImageData(x, y, width, height).data;

for (let i = 0, dx = 0; dx < data.length; i++, dx = i << 2) 
{
    if (pixels[dx+3] <= 8) { console.log("transparent x= " + i); }
}

Added or Corrected minor details...

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edited Jul 23, 2022 at 14:48

VC.One

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4
27
66

With : i << 2

const data = context.getImageData(x, y, width, height).data;
//const pixels = [];

for (let i = 0, dx = 0; dx < data.length; i++, dx = i << 2)  
{
    if (data[dx+3] <= 8)
       { console.log("transparent x= " + i); }
}

With : i << 2

const data = context.getImageData(x, y, width, height).data;
const pixels = [];

for (let i = 0, dx = 0; dx < data.length; i++, dx = i << 2) {
    if (data[dx+3] <= 8)
        console.log("transparent x= " + i);
}

With : i << 2

const data = context.getImageData(x, y, width, height).data;
//const pixels = [];

for (let i = 0, dx = 0; dx < data.length; i++, dx = i << 2)  
{
    if (data[dx+3] <= 8) { console.log("transparent x= " + i); }
}

added 17 characters in body

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edited Jul 15, 2018 at 11:09

user2226755

13.3k
6
55
77

With : i << 2

const data = context.getImageData(x, y, width, height).data;
const pixels = [];

for (let i = 0, xdx = 0; idx < data.length; i++, xdx = i << 2) {
    console.logif (data[x+3]data[dx+3] <= 8)
 ? "transparent" : "no"    console.log("transparent x= " + i);
}

With : i << 2

const data = context.getImageData(x, y, width, height).data;
const pixels = [];

for (let i = 0, x = 0; i < data.length; i++, x = i << 2) {
    console.log(data[x+3] <= 8 ? "transparent" : "no");
}

With : i << 2

const data = context.getImageData(x, y, width, height).data;
const pixels = [];

for (let i = 0, dx = 0; dx < data.length; i++, dx = i << 2) {
    if (data[dx+3] <= 8)
        console.log("transparent x= " + i);
}

Source Link

answered Jul 15, 2018 at 10:38

user2226755

13.3k
6
55
77

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