Come creare acquisizioni di immagini trasparenti?

È possibile dare a catture di immagini HTML e schermate di URL uno sfondo trasparente. Tuttavia, funzionerà solo se lo sfondo dell'HTML acquisito è trasparente e il formato dell'immagine è PNG o TIFF. Se usi un formato immagine diverso da PNG o TIFF otterrai uno sfondo nero.

Affinché un documento HTML abbia uno sfondo trasparente, la proprietà di sfondo CSS deve essere impostata su trasparente per entrambi html e body tag come mostrato negli esempi seguenti.

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GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");
ImageOptions options = new ImageOptions();
options.Format = ImageFormat.png;
options.Transparent = true;
grabzIt.HTMLToImage("<html><head><style>html,body{background:transparent}</style></head><body><h1>Hello World!</h1></body></html>"
, options);
grabzIt.SaveTo("result.png");

GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");
ImageOptions options = new ImageOptions();
options.setFormat(ImageFormat.PNG);
options.setTransparent(true);
grabzIt.HTMLToImage("<html><head><style>html,body{background:transparent}</style></head><body><h1>Hello World!</h1></body></html>"
, options);
grabzIt.SaveTo("result.png");

<script src="https://cdn.jsdelivr.net/npm/@grabzit/js@3.4.8/grabzit.min.js"></script>
<script>
GrabzIt("Sign in to view your Application Key").ConvertHTML(
"<html><head><style>html,body{background:transparent}</style></head><body><h1>Hello World!</h1></body></html>",
{"format":"png","transparent":1}).Create();
</script>

var grabzit = require('grabzit');

var client = new grabzit("Sign in to view your Application Key", "Sign in to view your Application Secret");
client.html_to_image("<html><head><style>html,body{background:transparent}</style></head><body><h1>Hello World!</h1></body></html>",
{"format":"png","transparent":1});
client.save_to("result.png", function (error, id){
    if (error != null){
        throw error;
    }
});

$grabzIt = GrabzItClient->new("Sign in to view your Application Key", "Sign in to view your Application Secret");
$options = GrabzItImageOptions->new();
$options->format("png");
$options->transparent(1);
$grabzIt->HTMLToImage("<html><head><style>html,body{background:transparent}</style></head><body><h1>Hello World!</h1></body></html>", 
$options);
$grabzIt->SaveTo("result.png");

$grabzIt = new \GrabzIt\GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");
$options = new \GrabzIt\GrabzItImageOptions();
$options->setFormat("png");
$options->setTransparent(true);
$grabzIt->HTMLToImage("<html><head><style>html,body{background:transparent}</style></head><body><h1>Hello World!</h1></body></html>",
$options);
$grabzIt->SaveTo("result.png");

grabzIt = GrabzItClient.GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret")
options = GrabzItImageOptions.GrabzItImageOptions()
options.format = "png"
options.transparent = True
grabzIt.HTMLToImage("<html><head><style>html,body{background:transparent}</style></head><body><h1>Hello World!</h1></body></html>",
options)
grabzIt.SaveTo("result.png")

    curl 
    -d key=Sign in to view your Application Key
    -d format=png
    -d transparent=1
    -d html=%3Chtml%3E%3Chead%3E%3Cstyle%3Ehtml%2Cbody%7Bbackground%3Atransparent%7D%3C%2Fstyle%3E%3C%2Fhead%3E%3Cbody%3E%3Ch1%3EHello%20World%21%3C%2Fh1%3E%3C%2Fbody%3E%3C%2Fhtml%3E
    https://api.grabz.it/services/convert.ashx

grabzIt = GrabzIt::Client.new("Sign in to view your Application Key", "Sign in to view your Application Secret")
options = GrabzIt::ImageOptions.new()
options.format = "png"
options.transparent = true
grabzIt.html_to_image("<html><head><style>html,body{background:transparent}</style></head><body><h1>Hello World!</h1></body></html>",
options)
grabzIt.save_to("result.png")