adjust contrast!
This commit is contained in:
Anthony Stirling
parent
a3c7f5aa46
commit
5877b40be5
2 changed files with 134 additions and 72 deletions
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@ -143,6 +143,8 @@ home.add-page-numbers.desc=Add Page numbers throughout a document in a set locat
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home.auto-rename.title=Auto Rename PDF File
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home.auto-rename.desc=Auto renames a PDF file based on its detected header
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home.adjust-contrast.title=Adjust Colors/Contrast
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home.adjust-contrast.desc=Adjust Contrast, Saturation and Brightness of a PDF
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error.pdfPassword=The PDF Document is passworded and either the password was not provided or was incorrect
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@ -1,7 +1,10 @@
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<!DOCTYPE html>
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<html th:lang="${#locale.toString()}" th:lang-direction="#{language.direction}" xmlns:th="http://www.thymeleaf.org">
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<html th:lang="${#locale.toString()}"
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th:lang-direction="#{language.direction}"
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xmlns:th="http://www.thymeleaf.org">
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<th:block th:insert="~{fragments/common :: head(title=#{extractImages.title})}"></th:block>
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<th:block
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th:insert="~{fragments/common :: head(title=#{extractImages.title})}"></th:block>
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<body>
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@ -16,14 +19,23 @@
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<input type="file" id="pdf-file" accept="application/pdf" />
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<canvas id="pdf-canvas"></canvas>
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<h4>Contrast: <span id="contrast-val">100</span>%</h4>
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<input type="range" min="0" max="200" value="100" id="contrast-slider" />
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<h4>
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Contrast: <span id="contrast-val">100</span>%
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</h4>
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<input type="range" min="0" max="200" value="100"
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id="contrast-slider" />
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<h4>Brightness: <span id="brightness-val">100</span>%</h4>
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<input type="range" min="0" max="200" value="100" id="brightness-slider" />
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<h4>
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Brightness: <span id="brightness-val">100</span>%
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</h4>
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<input type="range" min="0" max="200" value="100"
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id="brightness-slider" />
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<h4>Saturation: <span id="saturation-val">100</span>%</h4>
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<input type="range" min="0" max="200" value="100" id="saturation-slider" />
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<h4>
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Saturation: <span id="saturation-val">100</span>%
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</h4>
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<input type="range" min="0" max="200" value="100"
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id="saturation-slider" />
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<button id="download-button">Download</button>
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@ -32,13 +44,32 @@
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var canvas = document.getElementById('pdf-canvas');
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var context = canvas.getContext('2d');
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var originalImageData = null;
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var allPages = [];
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var pdfDoc = null;
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var pdf = null; // This is the current PDF document
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function renderPDFAndSaveOriginalImageData(file) {
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async function renderPDFAndSaveOriginalImageData(file) {
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var fileReader = new FileReader();
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fileReader.onload = function() {
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fileReader.onload = async function() {
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var data = new Uint8Array(this.result);
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pdfjsLib.getDocument({data: data}).promise.then(function(pdf) {
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pdf.getPage(1).then(function(page) {
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pdf = await pdfjsLib.getDocument({data: data}).promise;
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// Get the number of pages in the PDF
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var numPages = pdf.numPages;
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allPages = Array.from({length: numPages}, (_, i) => i + 1);
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// Create a new PDF document
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pdfDoc = await PDFLib.PDFDocument.create();
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// Render the first page in the viewer
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await renderPageAndAdjustImageProperties(1);
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};
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fileReader.readAsArrayBuffer(file);
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}
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// This function is now async and returns a promise
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function renderPageAndAdjustImageProperties(pageNum) {
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return new Promise(async function(resolve, reject) {
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var page = await pdf.getPage(pageNum);
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var scale = 1.5;
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var viewport = page.getViewport({ scale: scale });
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@ -53,13 +84,13 @@
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var renderTask = page.render(renderContext);
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renderTask.promise.then(function () {
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originalImageData = context.getImageData(0, 0, canvas.width, canvas.height);
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adjustImageProperties();
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resolve();
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});
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});
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});
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};
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fileReader.readAsArrayBuffer(file);
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}
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function adjustImageProperties() {
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var contrast = parseFloat(document.getElementById('contrast-slider').value);
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var brightness = parseFloat(document.getElementById('brightness-slider').value);
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@ -87,16 +118,7 @@
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g = adjustBrightnessForPixel(g, brightness);
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b = adjustBrightnessForPixel(b, brightness);
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// Adjust saturation
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if(i==100){
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console.log('r',r)
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console.log('g',g)
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console.log('b',b)
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console.log('saturation',saturation)
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}
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var rgb = adjustSaturationForPixel(r, g, b, saturation);
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if(i==100){
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console.log('rgb',rgb)
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}
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newImageData.data[i] = rgb[0];
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newImageData.data[i+1] = rgb[1];
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newImageData.data[i+2] = rgb[2];
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@ -187,13 +209,51 @@
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return Math.max(0, Math.min(255, pixel * brightness));
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}
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function downloadImage() {
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var downloadLink = document.createElement('a');
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downloadLink.href = canvas.toDataURL('image/png');
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downloadLink.download = 'download.png';
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downloadLink.click();
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async function downloadPDF() {
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for (var i = 0; i < allPages.length; i++) {
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await renderPageAndAdjustImageProperties(allPages[i]);
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const pngImageBytes = canvas.toDataURL('image/png');
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const pngImage = await pdfDoc.embedPng(pngImageBytes);
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const pngDims = pngImage.scale(1);
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// Create a blank page matching the dimensions of the image
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const page = pdfDoc.addPage([pngDims.width, pngDims.height]);
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// Draw the PNG image
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page.drawImage(pngImage, {
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x: 0,
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y: 0,
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width: pngDims.width,
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height: pngDims.height
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});
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}
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// Serialize the PDFDocument to bytes (a Uint8Array)
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const pdfBytes = await pdfDoc.save();
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// Create a Blob
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const blob = new Blob([pdfBytes.buffer], {type: "application/pdf"});
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// Create download link
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const downloadLink = document.createElement('a');
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downloadLink.href = URL.createObjectURL(blob);
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downloadLink.download = "download.pdf";
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downloadLink.click();
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// After download, reset the viewer and clear stored data
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allPages = []; // Clear the pages
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originalImageData = null; // Clear the image data
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// Go back to page 1 and render it in the viewer
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if (pdf !== null) {
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renderPageAndAdjustImageProperties(1);
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}
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}
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// Event listeners
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document.getElementById('pdf-file').addEventListener('change', function(e) {
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if (e.target.files.length > 0) {
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@ -217,7 +277,7 @@
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});
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document.getElementById('download-button').addEventListener('click', function() {
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downloadImage();
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downloadPDF();
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});
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</script>
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