HTML5畫布對比度濾鏡

3

既然你說過你已經調整了亮度，聽起來你所需要的只是對比度調整算法，這裏是C＃方法的一個線程（查看Update 2），代碼的邏輯是合理的，並且可以工作任何程序：

Adjust the contrast of an image in C# efficiently - Stack Overflow

來源

2012-06-20 19:14:20 TheZ

+0

謝謝，我設法重新寫它在JavaScript中，它使用-100到100範圍滑塊完美工作。 – mfreitas

+0

謝謝！我也用JS重寫了它，供我使用！ –

1

退房Pixastic提供了很多很棒的效果，你可以玩樣品Editor來看看一些功能。 Pixastic brightness/contrast example

繼承人一個演示我掀起了對比馬里奧。

Live Demo

也簽了它如何工作落實到你的代碼，如果你不希望使用全庫的想法pixastic github source code for the contrast method。

來源

2012-06-20 19:12:48 Loktar

+1

那是一個非常好的插件，我必須說，但我發現一個@TheZ sugested要容易理解得多。無論如何，我一定會在另一個項目中使用它，所以非常感謝您的建議！ – mfreitas

+0

沒問題，只是很高興你能解決你的問題:) – Loktar

+0

它確實是一個偉大的插件...直到你綁定了很多事件處理程序到相同的畫布！嘗試一下！ –

0

，我將發佈演示中，所有過濾器。您可以通過編號或類在畫布上輕鬆使用此功能。但問題是，你不能用畫布渲染這意味着你不保存這個或預覽。因爲畫布無法呈現樣式。

代碼

<!-- canvas --> 
<html> 
<head> 
<style> 
img { 
    width: 33%; 
    height: auto; 
    float: left; 
} 
.origional {filter:none;} 
.blur {-webkit-filter: blur(4px);filter: blur(4px);} 
.brightness {-webkit-filter: brightness(0.30);filter: brightness(0.30);} 
.contrast {-webkit-filter: contrast(180%);filter: contrast(180%);} 
.grayscale {-webkit-filter: grayscale(100%);filter: grayscale(100%);} 
.huerotate {-webkit-filter: hue-rotate(180deg);filter: hue-rotate(180deg);} 
.invert {-webkit-filter: invert(100%);filter: invert(100%);} 
.opacity {-webkit-filter: opacity(50%);filter: opacity(50%);} 
.saturate {-webkit-filter: saturate(7); filter: saturate(7);} 
.sepia {-webkit-filter: sepia(100%);filter: sepia(100%);} 
.shadow {-webkit-filter: drop-shadow(8px 8px 10px green);filter: drop-shadow(8px 8px 10px green);} 
</style> 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js" type="text/javascript"></script> 
<script> 
$(document).ready(function() { 
//origional canvas image 
    var canvas = document.getElementById("canvas"); 
    var ctx = canvas.getContext("2d"); 
    var img = document.getElementById("origional"); 
    ctx.drawImage(img, 0, 0,300,300); 

    $('#button').click(function() { 
    canvas.classList.add("origional"); 
    canvas.classList.remove("blur"); 
    canvas.classList.remove("brightness"); 
    canvas.classList.remove("contrast"); 
    canvas.classList.remove("grayscale"); 
    canvas.classList.remove("huerotate"); 
    canvas.classList.remove("invert"); 
    canvas.classList.remove("opacity"); 
    canvas.classList.remove("saturate"); 
    canvas.classList.remove("sepia"); 
    canvas.classList.remove("shadow"); 
}); 

    $('#button1').click(function() { 
    canvas.classList.add("blur"); 
    canvas.classList.remove("origional"); 
    canvas.classList.remove("brightness"); 
    canvas.classList.remove("contrast"); 
    canvas.classList.remove("grayscale"); 
    canvas.classList.remove("huerotate"); 
    canvas.classList.remove("invert"); 
    canvas.classList.remove("opacity"); 
    canvas.classList.remove("saturate"); 
    canvas.classList.remove("sepia"); 
    canvas.classList.remove("shadow"); 
}); 

    $('#button2').click(function() { 
    canvas.classList.add("brightness"); 
    canvas.classList.remove("blur"); 
    canvas.classList.remove("origional"); 
    canvas.classList.remove("contrast"); 
    canvas.classList.remove("grayscale"); 
    canvas.classList.remove("huerotate"); 
    canvas.classList.remove("invert"); 
    canvas.classList.remove("opacity"); 
    canvas.classList.remove("saturate"); 
    canvas.classList.remove("sepia"); 
    canvas.classList.remove("shadow"); 
}); 
    $('#button3').click(function() { 
    canvas.classList.add("contrast"); 
    canvas.classList.remove("blur"); 
    canvas.classList.remove("brightness"); 
    canvas.classList.remove("origional"); 
    canvas.classList.remove("grayscale"); 
    canvas.classList.remove("huerotate"); 
    canvas.classList.remove("invert"); 
    canvas.classList.remove("opacity"); 
    canvas.classList.remove("saturate"); 
    canvas.classList.remove("sepia"); 
    canvas.classList.remove("shadow"); 
}); 
    $('#button4').click(function() { 
    canvas.classList.add("grayscale"); 
    canvas.classList.remove("blur"); 
    canvas.classList.remove("brightness"); 
    canvas.classList.remove("contrast"); 
    canvas.classList.remove("origional"); 
    canvas.classList.remove("huerotate"); 
    canvas.classList.remove("invert"); 
    canvas.classList.remove("opacity"); 
    canvas.classList.remove("saturate"); 
    canvas.classList.remove("sepia"); 
    canvas.classList.remove("shadow"); 
}); 
    $('#button5').click(function() { 
    canvas.classList.add("huerotate"); 
    canvas.classList.remove("blur"); 
    canvas.classList.remove("brightness"); 
    canvas.classList.remove("contrast"); 
    canvas.classList.remove("grayscale"); 
    canvas.classList.remove("origional"); 
    canvas.classList.remove("invert"); 
    canvas.classList.remove("opacity"); 
    canvas.classList.remove("saturate"); 
    canvas.classList.remove("sepia"); 
    canvas.classList.remove("shadow"); 
}); 
    $('#button6').click(function() { 
    canvas.classList.add("invert"); 
    canvas.classList.remove("blur"); 
    canvas.classList.remove("brightness"); 
    canvas.classList.remove("contrast"); 
    canvas.classList.remove("grayscale"); 
    canvas.classList.remove("huerotate"); 
    canvas.classList.remove("origional"); 
    canvas.classList.remove("opacity"); 
    canvas.classList.remove("saturate"); 
    canvas.classList.remove("sepia"); 
    canvas.classList.remove("shadow"); 
}); 
    $('#button7').click(function() { 
    canvas.classList.add("opacity"); 
    canvas.classList.remove("blur"); 
    canvas.classList.remove("brightness"); 
    canvas.classList.remove("contrast"); 
    canvas.classList.remove("grayscale"); 
    canvas.classList.remove("huerotate"); 
    canvas.classList.remove("invert"); 
    canvas.classList.remove("origional"); 
    canvas.classList.remove("saturate"); 
    canvas.classList.remove("sepia"); 
    canvas.classList.remove("shadow"); 
}); 
    $('#button8').click(function() { 
    canvas.classList.add("saturate"); 
    canvas.classList.remove("blur"); 
    canvas.classList.remove("brightness"); 
    canvas.classList.remove("contrast"); 
    canvas.classList.remove("grayscale"); 
    canvas.classList.remove("huerotate"); 
    canvas.classList.remove("invert"); 
    canvas.classList.remove("opacity"); 
    canvas.classList.remove("origional"); 
    canvas.classList.remove("sepia"); 
    canvas.classList.remove("shadow"); 
}); 
    $('#button9').click(function() { 
    canvas.classList.add("sapia"); 
    canvas.classList.remove("blur"); 
    canvas.classList.remove("brightness"); 
    canvas.classList.remove("contrast"); 
    canvas.classList.remove("grayscale"); 
    canvas.classList.remove("huerotate"); 
    canvas.classList.remove("invert"); 
    canvas.classList.remove("opacity"); 
    canvas.classList.remove("saturate"); 
    canvas.classList.remove("origional"); 
    canvas.classList.remove("shadow"); 
}); 
    $('#button10').click(function() { 
    canvas.classList.add("shadow"); 
    canvas.classList.remove("blur"); 
    canvas.classList.remove("brightness"); 
    canvas.classList.remove("contrast"); 
    canvas.classList.remove("grayscale"); 
    canvas.classList.remove("huerotate"); 
    canvas.classList.remove("invert"); 
    canvas.classList.remove("opacity"); 
    canvas.classList.remove("saturate"); 
    canvas.classList.remove("sepia"); 
    canvas.classList.remove("origional"); 
}); 
}); 
</script> 
</head> 
<body> 
<h1> 
canvas 
</h1> 
<canvas id="canvas" width="300" height="300" ></canvas> 
<br> 
<div ><input type="button" id="button" value="origional" /> 
<input type="button" id="button1" value="blur" /> 
<input type="button" id="button2" value="brightness" /> 
<input type="button" id="button3" value="contrast" /> 
<input type="button" id="button4" value="grayscale" /> 
<input type="button" id="button5" value="huerotate" /> 
<input type="button" id="button6" value="invert" /> 
<input type="button" id="button7" value="opacity" /> 
<input type="button" id="button8" value="saturate" /> 
<input type="button" id="button9" value="sepia" /> 
<input type="button" id="button10" value="shadow" /> 
</div> 
<br> 
<!-- image --> 
<h1> 
image 
</h1> 
<img id="origional" src="https://lh5.googleusercontent.com/-bSF6HLBpWZU/AAAAAAAAAAI/AAAAAAAAABI/6UVYOKY6QhE/photo.jpg" alt="Pineapple" width="300" height="300"> 
<img id="blur" class="blur" src="https://lh5.googleusercontent.com/-bSF6HLBpWZU/AAAAAAAAAAI/AAAAAAAAABI/6UVYOKY6QhE/photo.jpg" alt="Pineapple" width="300" height="300"> 
<img class="brightness" src="https://lh5.googleusercontent.com/-bSF6HLBpWZU/AAAAAAAAAAI/AAAAAAAAABI/6UVYOKY6QhE/photo.jpg" alt="Pineapple" width="300" height="300"> 
<img class="contrast" src="https://lh5.googleusercontent.com/-bSF6HLBpWZU/AAAAAAAAAAI/AAAAAAAAABI/6UVYOKY6QhE/photo.jpg" alt="Pineapple" width="300" height="300"> 
<img class="grayscale" src="https://lh5.googleusercontent.com/-bSF6HLBpWZU/AAAAAAAAAAI/AAAAAAAAABI/6UVYOKY6QhE/photo.jpg" alt="Pineapple" width="300" height="300"> 
<img class="huerotate" src="https://lh5.googleusercontent.com/-bSF6HLBpWZU/AAAAAAAAAAI/AAAAAAAAABI/6UVYOKY6QhE/photo.jpg" alt="Pineapple" width="300" height="300"> 
<img class="invert" src="https://lh5.googleusercontent.com/-bSF6HLBpWZU/AAAAAAAAAAI/AAAAAAAAABI/6UVYOKY6QhE/photo.jpg" alt="Pineapple" width="300" height="300"> 
<img class="opacity" src="https://lh5.googleusercontent.com/-bSF6HLBpWZU/AAAAAAAAAAI/AAAAAAAAABI/6UVYOKY6QhE/photo.jpg" alt="Pineapple" width="300" height="300"> 
<img class="saturate" src="https://lh5.googleusercontent.com/-bSF6HLBpWZU/AAAAAAAAAAI/AAAAAAAAABI/6UVYOKY6QhE/photo.jpg" alt="Pineapple" width="300" height="300"> 
<img class="sepia" src="https://lh5.googleusercontent.com/-bSF6HLBpWZU/AAAAAAAAAAI/AAAAAAAAABI/6UVYOKY6QhE/photo.jpg" alt="Pineapple" width="300" height="300"> 
<img class="shadow" src="https://lh5.googleusercontent.com/-bSF6HLBpWZU/AAAAAAAAAAI/AAAAAAAAABI/6UVYOKY6QhE/photo.jpg" alt="Pineapple" width="300" height="300"> 
</body> 
</html>

這裏Live Demo

來源

2017-03-27 09:11:31

HTML5畫布對比度濾鏡

回答

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