透過網頁讀取PSD後,依圖層輸出PNG檔案
在前面介紹過網頁可以讀取PSD檔案並擷取到該檔案的資訊,接著我們會希望能透過網頁上傳PSD檔之後,依照圖層來輸出圖片,同樣是利用PSD.js來輔助進行,可以透過我們製作的範例頁面來進行輸出測試。
預設輸出效果
透過PSD.js可將PSD內的各圖層輸出成PNG圖檔,亦可轉成Base 64圖檔格式,惟輸出時每個圖檔的尺寸並不會根據整體PSD檔大小來配置。
<!DOCTYPE html> <html> <head> <title>psd.js image example</title> <style type="text/css"> body, html { padding: 0; margin: 0; } #dropzone { width: 500px; height: 100px; border: 1px #ababab dashed; margin: 50px auto; } #dropzone p { text-align: center; line-height: 100px; margin: 0; padding: 0; } #image { text-align: center; } </style> <script type="text/javascript" src="psd.min.js"></script> </head> <body> <div id="dropzone"> <p>Drop PSD here</p> </div> <div id="image"></div> <pre id="data"></pre> <script type="text/javascript"> (function () { const PSD = require('psd'); document.getElementById('dropzone').addEventListener('dragover', onDragOver, true); document.getElementById('dropzone').addEventListener('drop', onDrop, true); function onDragOver(e) { e.stopPropagation(); e.preventDefault(); e.dataTransfer.dropEffect = 'copy'; } function onDrop(e) { e.stopPropagation(); e.preventDefault(); PSD.fromEvent(e).then(function (psd) { for (var i = 0; i < psd.layers.length; i ++){ document.getElementById('image').appendChild(psd.layers[i].image.toPng()); } }); } }()); </script> </body> </html>
依照整體PSD配置進行輸出
我們希望讓每個圖片在輸出後能保時相同的尺寸,也就是依照PSD的畫布大小來輸出每一張圖檔,但在原生PSD.js中並不具備這樣的功能,於是我們透過下述的方式來達成:
- 擷取PSD資訊並將圖檔轉為Base 64格式
- 產生與PSD尺寸大小相同的HTML Canvas
- 將產生的Base 64圖檔,依照原始位置放入Canvas中
- 將Canvas轉成PNG圖檔
可以參考我們製作的範例頁面
<!DOCTYPE html> <html> <head> <title>psd.js image example</title> <style type="text/css"> body, html { padding: 0; margin: 0; } #dropzone { width: 500px; height: 100px; border: 1px #ababab dashed; margin: 50px auto; } #dropzone p { text-align: center; line-height: 100px; margin: 0; padding: 0; } #image { text-align: center; } </style> <script type="text/javascript" src="psd.min.js"></script> </head> <body> <div id="dropzone"> <p>Drop PSD here</p> </div> <div id="image"></div> <pre id="data"></pre> <script type="text/javascript"> (function () { const PSD = require('psd'); document.getElementById('dropzone').addEventListener('dragover', onDragOver, true); document.getElementById('dropzone').addEventListener('drop', onDrop, true); function onDragOver(e) { e.stopPropagation(); e.preventDefault(); e.dataTransfer.dropEffect = 'copy'; } function onDrop(e) { e.stopPropagation(); e.preventDefault(); PSD.fromEvent(e).then(function (psd) { const PSDWidth = psd.tree().width; const PSDHeight = psd.tree().height; for (var i = 0; i < psd.layers.length; i ++){ const img = new Image(); img.src = psd.layers[i].image.toBase64(); console.log(psd); const layerWidth = psd.layers[i].width; const layerHeight = psd.layers[i].height; const layerLeft = psd.layers[i].left; const layerTop = psd.layers[i].top; const canvas = document.createElement("canvas"); canvas.setAttribute('class', "canvas"); canvas.width = PSDWidth; canvas.height = PSDHeight; console.log("canvas :", canvas); img.onload = function(){ canvas.getContext("2d").drawImage(img, layerLeft, layerTop, layerWidth, layerHeight); document.getElementById('image').appendChild(canvas); } } }); } }()); </script> </body> </html>
PSD檔案輸出限制
1. 無法輸出帶有效果的圖片
在PSD中我們可能會針對圖層套用一些效果,例如:陰影、光暈、筆畫…等等,但在輸出後的圖檔將不會帶有這些效果。
解決方法:透過點陣化圖層效果,即可輸出相對應的圖檔。
2. 無法輸出帶有遮色片效果的圖片
解決方法:將圖層轉為智慧型物件,即可輸出相對應的圖檔。
3. 無法依圖層混合模式輸出圖片
解決方法:無法解決
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