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use 128 as example alpha value for half-transparent. #19

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use 128 as example alpha value for half-transparent. #19

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8 changes: 4 additions & 4 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -63,8 +63,8 @@ var image = PNGImage.createImage(100, 300);
console.log(image.getWidth());
console.log(image.getHeight());

// Set a pixel at (20, 30) with red, having an alpha value of 100 (half-transparent)
image.setAt(20, 30, { red:255, green:0, blue:0, alpha:100 });
// Set a pixel at (20, 30) with red, having an alpha value of 128 (half-transparent)
image.setAt(20, 30, { red:255, green:0, blue:0, alpha:128 });

// Get index of coordinate in the image buffer
var index = image.getIndex(20, 30);
Expand All @@ -90,8 +90,8 @@ PNGImage.readImage('path/to/file', function (err, image) {
console.log(image.getWidth());
console.log(image.getHeight());

// Set a pixel at (20, 30) with red, having an alpha value of 100 (half-transparent)
image.setAt(20, 30, { red:255, green:0, blue:0, alpha:100 });
// Set a pixel at (20, 30) with red, having an alpha value of 128 (half-transparent)
image.setAt(20, 30, { red:255, green:0, blue:0, alpha:128 });
});
```

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