bit map

A type of image (also called raster graphics), consisting of a matrix of dots where each pixel is visible at 100% resolution. Common bitmap file formats include JPG, PNG, GIF, and BMP. In custom garment printing, bitmap images are frequently used for photographs, detailed illustrations, and complex designs with gradients or shading.

In the Australian garment printing industry, understanding bitmap artwork is essential for achieving accurate and high-quality print results, particularly when preparing customer-supplied designs.

How Bitmap Images Work

Pixel-Based Structure

Bitmap images are resolution-dependent. Each image consists of thousands or millions of pixels arranged in rows and columns. When enlarged beyond their original size, bitmaps can become blurry or pixelated.

Fixed Resolution

Unlike vector artwork, bitmap images cannot be scaled up without losing quality. The resolution, measured in DPI (dots per inch), determines how sharp the image will appear when printed.

Common Bitmap File Formats

JPG (JPEG)

JPG files are widely used for photographs and web images. They use compression, which can reduce file size but may also lower image quality.

PNG

PNG files support transparency and are often used for logos and artwork placed over coloured garments.

GIF and BMP

These formats are less common in professional printing but may still appear in customer-supplied artwork.

Benefits of Using Bitmap Artwork

Ideal for Photographic Detail

Bitmaps can capture fine detail, shading, and colour transitions that are difficult to achieve with vector artwork.

Suitable for Digital Printing

DTG and DTF printing methods can reproduce bitmap images accurately, making them suitable for short runs and full-colour designs.

Easy to Create and Share

Bitmap images are commonly generated from cameras, design software, and online tools, making them accessible for most customers.

Limitations of Bitmap Artwork

Resolution Sensitivity

Low-resolution bitmap files may appear pixelated or soft when printed, particularly at larger sizes.

Editing Constraints

Editing bitmaps can be more complex than vectors, especially when resizing or changing colours.

Not Ideal for All Print Methods

Screen printing often requires bitmap artwork to be converted or simplified, particularly for single-colour or multi-colour separations.

Practical Considerations for Bitmap Printing

Recommended Resolution

For garment printing, bitmap artwork should typically be supplied at 300 DPI at final print size to ensure sharp results.

Background and Transparency

PNG files with transparent backgrounds are preferred when placing designs on coloured garments.

Artwork Approval Process

Printers often review bitmap files to assess suitability and may request higher-resolution files if needed.

Bitmap vs Vector Artwork

While vector files offer scalability and cleaner edges, bitmaps excel at detailed and photographic designs. Many Australian printers use a combination of both formats depending on the printing method and design requirements.

Why Bitmap Knowledge Matters in Garment Printing

Understanding bitmap artwork helps ensure smoother production and better print quality. For Australian businesses and customers alike, supplying correctly prepared bitmap files reduces delays, avoids quality issues, and results in professional, durable custom apparel.

Bit Map