Add direct image download to pdf-to-tiff

src/js/logic/pdf-to-tiff-page.ts

@@ -1,11 +1,21 @@
 import { showLoader, hideLoader, showAlert } from '../ui.js';
-import { downloadFile, formatBytes, readFileAsArrayBuffer, getPDFDocument } from '../utils/helpers.js';
+import {
+  downloadFile,
+  formatBytes,
+  readFileAsArrayBuffer,
+  getPDFDocument,
+  getCleanPdfFilename,
+} from '../utils/helpers.js';
 import { createIcons, icons } from 'lucide';
 import JSZip from 'jszip';
 import * as pdfjsLib from 'pdfjs-dist';
 import UTIF from 'utif';
+import { PDFPageProxy } from 'pdfjs-dist';
 
-pdfjsLib.GlobalWorkerOptions.workerSrc = new URL('pdfjs-dist/build/pdf.worker.min.mjs', import.meta.url).toString();
+pdfjsLib.GlobalWorkerOptions.workerSrc = new URL(
+  'pdfjs-dist/build/pdf.worker.min.mjs',
+  import.meta.url
+).toString();
 
 let files: File[] = [];
 
@@ -23,7 +33,8 @@ const updateUI = () => {
 
     files.forEach((file) => {
       const fileDiv = document.createElement('div');
-            fileDiv.className = 'flex items-center justify-between bg-gray-700 p-3 rounded-lg text-sm';
+      fileDiv.className =
+        'flex items-center justify-between bg-gray-700 p-3 rounded-lg text-sm';
 
       const infoContainer = document.createElement('div');
       infoContainer.className = 'flex flex-col overflow-hidden';
@@ -39,7 +50,8 @@ const updateUI = () => {
       infoContainer.append(nameSpan, metaSpan);
 
       const removeBtn = document.createElement('button');
-            removeBtn.className = 'ml-4 text-red-400 hover:text-red-300 flex-shrink-0';
+      removeBtn.className =
+        'ml-4 text-red-400 hover:text-red-300 flex-shrink-0';
       removeBtn.innerHTML = '<i data-lucide="trash-2" class="w-4 h-4"></i>';
       removeBtn.onclick = () => {
         files = [];
@@ -50,11 +62,14 @@ const updateUI = () => {
       fileDisplayArea.appendChild(fileDiv);
 
       // Fetch page count asynchronously
-            readFileAsArrayBuffer(file).then(buffer => {
+      readFileAsArrayBuffer(file)
+        .then((buffer) => {
           return getPDFDocument(buffer).promise;
-            }).then(pdf => {
+        })
+        .then((pdf) => {
           metaSpan.textContent = `${formatBytes(file.size)} • ${pdf.numPages} page${pdf.numPages !== 1 ? 's' : ''}`;
-            }).catch(e => {
+        })
+        .catch((e) => {
           console.warn('Error loading PDF page count:', e);
           metaSpan.textContent = formatBytes(file.size);
         });
@@ -81,45 +96,38 @@ async function convert() {
   }
   showLoader('Converting to TIFF...');
   try {
-        const pdf = await getPDFDocument(
-            await readFileAsArrayBuffer(files[0])
-        ).promise;
-        const zip = new JSZip();
+    const pdf = await getPDFDocument(await readFileAsArrayBuffer(files[0]))
+      .promise;
 
+    if (pdf.numPages === 1) {
+      const page = await pdf.getPage(1);
+      const blob = await renderPage(page, 1);
+      downloadFile(
+        blob.blobData,
+        getCleanPdfFilename(files[0].name) + '.' + blob.ending
+      );
+    } else {
+      const zip = new JSZip();
       for (let i = 1; i <= pdf.numPages; i++) {
         const page = await pdf.getPage(i);
-            const viewport = page.getViewport({ scale: 2.0 });
-            const canvas = document.createElement('canvas');
-            const context = canvas.getContext('2d');
-            canvas.height = viewport.height;
-            canvas.width = viewport.width;
-
-            await page.render({ canvasContext: context!, viewport: viewport, canvas }).promise;
-
-            const imageData = context!.getImageData(0, 0, canvas.width, canvas.height);
-            const rgba = imageData.data;
-
-            try {
-                const tiffData = UTIF.encodeImage(new Uint8Array(rgba), canvas.width, canvas.height);
-                const tiffBlob = new Blob([tiffData], { type: 'image/tiff' });
-                zip.file(`page_${i}.tiff`, tiffBlob);
-            } catch (encodeError: any) {
-                console.warn(`TIFF encoding failed for page ${i}, using PNG fallback:`, encodeError);
-                // Fallback to PNG if TIFF encoding fails (e.g., PackBits compression issues)
-                const pngBlob = await new Promise<Blob | null>((resolve) =>
-                    canvas.toBlob(resolve, 'image/png')
-                );
-                if (pngBlob) {
-                    zip.file(`page_${i}.png`, pngBlob);
-                }
+        const blob = await renderPage(page, i);
+        if (blob.blobData) {
+          zip.file(`page_${i}.` + blob.ending, blob.blobData);
         }
       }
 
       const zipBlob = await zip.generateAsync({ type: 'blob' });
-        downloadFile(zipBlob, 'converted_images.zip');
-        showAlert('Success', 'PDF converted to TIFFs successfully!', 'success', () => {
+      downloadFile(zipBlob, getCleanPdfFilename(files[0].name) + '_tiffs.zip');
+    }
+
+    showAlert(
+      'Success',
+      'PDF converted to TIFFs successfully!',
+      'success',
+      () => {
         resetState();
-        });
+      }
+    );
   } catch (e) {
     console.error(e);
     showAlert(
@@ -131,6 +139,59 @@ async function convert() {
   }
 }
 
+async function renderPage(
+  page: PDFPageProxy,
+  pageNumber: number
+): Promise<{ blobData: Blob | null; ending: string }> {
+  const viewport = page.getViewport({ scale: 2.0 });
+  const canvas = document.createElement('canvas');
+  const context = canvas.getContext('2d');
+  canvas.height = viewport.height;
+  canvas.width = viewport.width;
+
+  await page.render({
+    canvasContext: context!,
+    viewport: viewport,
+    canvas,
+  }).promise;
+
+  const imageData = context!.getImageData(0, 0, canvas.width, canvas.height);
+  const rgba = imageData.data;
+
+  try {
+    const tiffData = UTIF.encodeImage(
+      new Uint8Array(rgba),
+      canvas.width,
+      canvas.height
+    );
+    const tiffBlob = new Blob([tiffData], { type: 'image/tiff' });
+    return {
+      blobData: tiffBlob,
+      ending: 'tiff',
+    };
+  } catch (encodeError: any) {
+    console.warn(
+      `TIFF encoding failed for page ${pageNumber}, using PNG fallback:`,
+      encodeError
+    );
+    // Fallback to PNG if TIFF encoding fails (e.g., PackBits compression issues)
+    const pngBlob = await new Promise<Blob | null>((resolve) =>
+      canvas.toBlob(resolve, 'image/png')
+    );
+    if (pngBlob) {
+      return {
+        blobData: pngBlob,
+        ending: 'png',
+      };
+    }
+  }
+
+  return {
+    blobData: null,
+    ending: 'tiff',
+  };
+}
+
 document.addEventListener('DOMContentLoaded', () => {
   const fileInput = document.getElementById('file-input') as HTMLInputElement;
   const dropZone = document.getElementById('drop-zone');

src/pages/pdf-to-tiff.html

@@ -155,7 +155,7 @@
         <div id="file-display-area" class="mt-4 space-y-2"></div>
         <div id="options-panel" class="hidden mt-6">
           <button id="process-btn" class="btn-gradient w-full">
-            Download All as ZIP
+            Download All
           </button>
         </div>
       </div>