如何從多頁/幀 GIF 和 TIFF 中讀取條形碼

海里海西米·賓·奧馬

2023年10月31日

已更新 2024年12月10日

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IronBarcode 支援多種影像格式輸入以進行讀取，包括多頁和多幀的 GIF 和 TIFF影像格式。這為用戶提供了便利，使他們可以直接使用圖像，而無需手動分離 TIFF 或 GIF 文件的框架或頁面。讓我們探索如何使用 IronBarcode 來讀取這些文件格式。

如何從多頁/幀 GIF 和 TIFF 中讀取條形碼

Download the C# library for reading barcodes
準備 GIF 和 TIFF 圖像以進行條碼檢測
將多幀 GIF 和 TIFF 圖像傳遞給 Read 方法
應用影像濾鏡和選項以提高準確性和性能
Convert images to multi-frame GIF and TIFF

開始使用 IronBarcode

立即在您的專案中使用IronBarcode，並享受免費試用。

第一步：

讀取多幀 GIF 和 TIFF 圖像

使用 IronBarcode 讀取多幀 GIF 和 TIFF 圖像與讀取單個圖像一樣簡單，因為 IronBarcode 可以直接接受多頁圖像文件到 BarcodeReader.Read 方法中。用戶不需要進行任何圖像準備，因為這些都已在庫中內部處理。

以下程式碼示例演示了如何讀取多頁面的GIF和TIFF文件：

:path=/static-assets/barcode/content-code-examples/how-to/read-barcodes-from-multi-page-frame-tiff-gif-read-tif.cs

using IronBarCode;
using System;

// Read barcode from TIF image
BarcodeResults results = BarcodeReader.Read("sample.tif");

// Output the barcodes value to console
foreach (var result in results)
{
    Console.WriteLine(result.Value);
}

Imports IronBarCode
Imports System

' Read barcode from TIF image
Private results As BarcodeResults = BarcodeReader.Read("sample.tif")

' Output the barcodes value to console
For Each result In results
	Console.WriteLine(result.Value)
Next result

$vbLabelText $csharpLabel

將圖像轉換為GIF和TIFF

了解如何使用我們的開源庫，IronDrawing，將圖像轉換為多頁 TIFF 和 GIF。現在，讓我們看看下面的代碼示例，了解如何生成多頁GIF或TIFF圖像。

:path=/static-assets/barcode/content-code-examples/how-to/read-barcodes-from-multi-page-frame-tiff-gif-create-tiff-gif.cs

using IronBarCode;
using IronSoftware.Drawing;
using System.Collections.Generic;

// Import images
List<AnyBitmap> images = new List<AnyBitmap>()
{
    AnyBitmap.FromFile("image1.png"),
    AnyBitmap.FromFile("image2.png"),
    AnyBitmap.FromFile("image3.png"),
    AnyBitmap.FromFile("image4.jpg"),
    AnyBitmap.FromFile("image5.jpg")
};

// Convert TIFF from images
AnyBitmap tiffImage = AnyBitmap.CreateMultiFrameTiff(images);

// Export TIFF
tiffImage.SaveAs("multiframetiff.tiff");

// Convert GIF from images
AnyBitmap gifImage = AnyBitmap.CreateMultiFrameGif(images);

// Export GIF
gifImage.SaveAs("multiframegif1.gif");

Imports IronBarCode
Imports IronSoftware.Drawing
Imports System.Collections.Generic

' Import images
Private images As New List(Of AnyBitmap)() From {AnyBitmap.FromFile("image1.png"), AnyBitmap.FromFile("image2.png"), AnyBitmap.FromFile("image3.png"), AnyBitmap.FromFile("image4.jpg"), AnyBitmap.FromFile("image5.jpg")}

' Convert TIFF from images
Private tiffImage As AnyBitmap = AnyBitmap.CreateMultiFrameTiff(images)

' Export TIFF
tiffImage.SaveAs("multiframetiff.tiff")

' Convert GIF from images
Dim gifImage As AnyBitmap = AnyBitmap.CreateMultiFrameGif(images)

' Export GIF
gifImage.SaveAs("multiframegif1.gif")

$vbLabelText $csharpLabel

從上面的程式碼片段中，我們可以先將一些影像檔案匯入到一個AnyBitmap物件列表中進行分組。這個列表可以在調用 AnyBitmap.CreateMultiFrameTiff 和 AnyBitmap.CreateMultiFrameGif 方法時作為參數，分別獲取多頁 TIFF 和多頁 GIF 物件。

雖然多頁GIF與TIFF都提供了將多張圖片組合成單一檔案的方式，但這兩種格式之間存在幾項差異，如下所述：

Aspect	Multipage GIF	Multipage TIFF
Compression	GIF images use lossless compression, meaning that no image data is lost during compression. This results in relatively larger file sizes compared to formats with lossy compression.	TIFF files can use various compression methods, including lossless compression (such as LZW) and lossy compression (such as JPEG). This flexibility allows TIFF files to balance between file size and image quality.
Color Depth	GIF supports up to 256 colors (8-bit color depth), which is limited compared to other formats. This limited color palette can result in a loss of detail and color accuracy, especially for photographs and images with gradients	TIFF supports various color depths, including 1-bit (binary), 8-bit (256 colors), 24-bit (true color), and more. This flexibility allows TIFF to store images with different levels of color detail.
Transparency	GIF supports binary transparency, which means that a single color can be fully transparent, and the rest of the colors are fully opaque. This lack of partial transparency can sometimes lead to jagged edges in images with smooth transitions.	TIFF supports multiple forms of transparency, including binary transparency (similar to GIF) and alpha channel transparency. Alpha channel transparency allows for smooth transitions and semi-transparent pixels, providing high-quality transparency effects.
Animation	GIF supports simple animations by combining multiple frames into a single file. Each frame can have its own time delay, creating a basic form of animation. GIF animations are widely supported on the web.	TIFF is not primarily designed for animations. While it can store multiple images, it lacks built-in animation support like GIF. Each page in a multipage TIFF file is typically a separate image rather than a frame in an animation sequence.

進階條碼讀取

雖然 IronBarcode 開箱即用，但有些圖像可能需要配置 BarcodeReaderOptions 類別，以達到準確和快速的條碼讀取。您可以在「如何從影像檔案（jpg、png、gif、tiff、svg、bmp）讀取條碼」文章中找到有關此類別的更多資訊。

以下代碼片段提供了可以在BarcodeReaderOptions類中配置的必要屬性的範例。

:path=/static-assets/barcode/content-code-examples/how-to/read-barcodes-from-multi-page-frame-tiff-gif-advance.cs

using IronBarCode;
using System;

// Configure filters
ImageFilterCollection filters = new ImageFilterCollection()
{
    new SharpenFilter(3.5f),
    new ContrastFilter(2)
};

// Configure options
BarcodeReaderOptions options = new BarcodeReaderOptions()
{
    ExpectBarcodeTypes = IronBarCode.BarcodeEncoding.QRCode,
    ImageFilters = filters,
    ExpectMultipleBarcodes = true,
    Speed = ReadingSpeed.Balanced
};

// Read barcode from TIF image
BarcodeResults results = BarcodeReader.Read("sample.tif", options);

// Output the barcodes value to console
foreach (var result in results)
{
    Console.WriteLine(result.Value);
}

Imports IronBarCode
Imports System

' Configure filters
Private filters As New ImageFilterCollection() From {
	New SharpenFilter(3.5F),
	New ContrastFilter(2)
}

' Configure options
Private options As New BarcodeReaderOptions() With {
	.ExpectBarcodeTypes = IronBarCode.BarcodeEncoding.QRCode,
	.ImageFilters = filters,
	.ExpectMultipleBarcodes = True,
	.Speed = ReadingSpeed.Balanced
}

' Read barcode from TIF image
Private results As BarcodeResults = BarcodeReader.Read("sample.tif", options)

' Output the barcodes value to console
For Each result In results
	Console.WriteLine(result.Value)
Next result

$vbLabelText $csharpLabel

在這段程式碼中，我們不僅設定了BarcodeReaderOptions屬性，還應用了某些篩選器，特別是SharpenFilter和ContrastFilter。這些過濾器本質上有助於提高模糊圖像的清晰度，以便於條碼檢測和讀取。您可以在'如何使用圖像校正濾鏡'文章中找到有關圖像校正濾鏡的更多信息。

對於BarcodeReaderOptions物件，我們建議用戶包含ExpectMultipleBarcodes以讓IronBarcode掃描影像檔中的所有可用條碼，Speed以在讀取準確性和效能之間取得平衡，ExpectBarcodeTypes以進一步提高效能，以及ImageFilters應用ImageFilterCollection物件中設定的濾鏡以提高讀取準確性。

雖然在大多數使用情況下設置BarcodeReaderOptions物件是可選的，但當從多頁的GIF和TIFF圖像文件中讀取條碼時，對於使用者來說，充分利用IronBarcode是很重要的。

海里海西米·賓·奧馬

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軟體工程師

和所有優秀的工程師一樣，Hairil 是一位熱衷學習的人。他正在精進自己對 C#、Python 和 Java 的知識，利用這些知識為 Iron Software 團隊的成員創造價值。Hairil 從馬來西亞的馬來西亞工藝大學加入了 Iron Software 團隊，他在那裡獲得了化學和過程工程學士學位。