Extract images to files Leave feedback
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Here are the steps to extract images to files:
- Instantiate the
Parserobject for the initial document; - Call the
getImages()method and obtain the collection ofPageImageAreaobjects; - Check if the collection isn’t
null(images extraction is supported for the document); - Iterate through the collection and save image contents to the file.
The following example shows how to save images to PNG files:
const fs = require('fs');
const path = require('path');
const groupdocs = require('@groupdocs/groupdocs.parser');
const outputDir = 'output';
fs.mkdirSync(outputDir, { recursive: true });
// Create an instance of Parser class
const parser = new groupdocs.Parser('sample.zip');
try {
// Extract images from document
const images = parser.getImages();
// Check if images extraction is supported
if (images == null) {
console.log("Page images extraction isn't supported");
} else {
// Create the options to save images in PNG format
const options = new groupdocs.ImageOptions(groupdocs.ImageFormat.Png);
let imageNumber = 0;
// Iterate over images
const it = images.iterator();
while (it.hasNext()) {
const image = it.next();
// Save the image to the png file
image.save(path.join(outputDir, `${imageNumber}.png`), options);
imageNumber++;
}
}
} finally {
parser.close();
}
process.exit(0);
getImageStream(ImageOptions) returns a Java InputStream. Read it with readAllBytes() and wrap the result in a Node.js Buffer when you need to process the image data in JavaScript (for example, to upload it or pass it to another library):
const fs = require('fs');
const path = require('path');
const groupdocs = require('@groupdocs/groupdocs.parser');
const outputDir = 'output';
fs.mkdirSync(outputDir, { recursive: true });
// Create an instance of Parser class
const parser = new groupdocs.Parser('images.pdf');
try {
// Extract images from document
const images = parser.getImages();
// Check if images extraction is supported
if (images == null) {
console.log("Images extraction isn't supported");
} else {
// Create the options to convert images to PNG format
const options = new groupdocs.ImageOptions(groupdocs.ImageFormat.Png);
let imageNumber = 0;
// Iterate over images
const it = images.iterator();
while (it.hasNext()) {
const image = it.next();
// Get the image as a Java InputStream
const stream = image.getImageStream(options);
try {
// Read all bytes and convert them to a Node.js Buffer
const buffer = Buffer.from(stream.readAllBytes());
fs.writeFileSync(path.join(outputDir, `${imageNumber}.png`), buffer);
} finally {
stream.close();
}
imageNumber++;
}
}
} finally {
parser.close();
}
process.exit(0);
Along with the full-featured library we provide simple but powerful free Apps.
You are welcome to extract data from PDF, DOC, DOCX, PPT, PPTX, XLS, XLSX, Emails and more with our Free Online Document Parser App.
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