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What is a compressed image?

  • Writer: Anvita Shrivastava
    Anvita Shrivastava
  • Mar 27
  • 3 min read

Updated: 5 days ago

As we increasingly rely on digital tools like websites, applications, and drones, compressing images is essential to maximizing performance and efficiency. Whether you're trying to reduce the size of aerial images for UAV platforms or speed up your website, you must understand what compressed images are.


compressed image
compressed image

What Is a Compressed Image?


A digital image file that has been compressed is a digital image file that has gone through compression algorithms to reduce the size of the image file to occupy less data while maintaining as much of the visual quality of the original image as feasible.


In layman's terms, an image is compressed by reducing the image file size while not greatly affecting how the image appears visually.


Why Compressed Images Matter


Compressed images are essential for web-based applications and technical applications such as UAV imaging systems. The following are the reasons why compressed images matter:


  1. Faster Load Times


When you reduce the size of images, they load faster, increasing the speed of a website and providing a better user experience.


  1. Reduced Storage Space


When you compress images, you save disk space on the server's hard drive, which is especially beneficial if you are working with high-resolution drone images.


  1. Reduced Bandwidth Usage


Compressed images require less data to be sent over the network and are therefore necessary for transmitting real-time UAV data.


  1. Improved SEO Performance


Search engines reward websites that load quickly. Therefore, having optimized images contributes to higher search engine rankings.


Types of Image Compression


There are two primary types of image compression:


  1. Lossy Compression


Lossy compression removes some image data permanently to achieve smaller file sizes.


Key characteristics:


  • Higher compression ratio

  • Smaller file size

  • Some loss of image quality


Common formats:


Best for:


  • Web images

  • Social media

  • UAV preview images


  1. Lossless Compression


Lossless compression reduces file size without removing any image data.


Key characteristics:


  • No quality loss

  • Larger file size compared to lossy

  • Fully reversible


Common formats:


Best for:


  • Technical imaging

  • UAV mapping and analysis

  • Medical or scientific images


How MrSID can help in compressing drone data


MrSID helps compress drone (UAV) imagery by using advanced wavelet-based, lossless or near-lossless compression to drastically reduce file size while preserving essential spatial detail. High-resolution drone data—often captured as large orthomosaics or raster images—can be hundreds of megabytes or even gigabytes in formats like GeoTIFF. MrSID efficiently compresses these datasets into much smaller files without significantly degrading visual quality, making them easier to store, share, and process. It also supports multi-resolution viewing, allowing users to quickly zoom in and out of large images without loading the entire dataset at full resolution, which improves performance in GIS software such as ArcGIS. This makes MrSID particularly useful for applications like mapping, surveying, and environmental monitoring, where large volumes of drone imagery must be handled efficiently.


Best Practices for Image Compression


  1. Choose the Right Compression Type


  • Use lossless compression when accuracy is critical (e.g., scientific analysis, elevation data)

  • Use visually lossless (high-quality lossy) compression for imagery (e.g., drone maps)

  • MrSID allows flexible compression ratios (e.g., 10:1 to 50:1) depending on needs


  1. Optimize Compression Ratio


  • Avoid over-compression → leads to blurred features and loss of detail

  • Test different ratios and visually inspect results


  1. Use Multi-Resolution Advantage


  • MrSID supports a pyramidal (multi-resolution) structure

  • Enables:

  • Fast zooming

  • Efficient rendering in GIS tools like ArcGIS and QGIS


  1. Convert Large GeoTIFFs to MrSID


  • Raw drone outputs are often GeoTIFFs (very large)

  • Convert to MrSID to:

  • Reduce storage

  • Improve sharing and loading speed


  1. Preserve Metadata and Projection


  • Ensure:

  • Coordinate system

  • Georeferencing

  • Metadata

  • are retained during compression


  1. Use Tiling for Very Large Datasets


  • Break extremely large rasters into manageable tiles before compression

  • Improves:

  • Processing speed

  • Rendering performance


7. Consider Use Case (Storage vs Web vs Analysis)

Use Case

Recommendation

Long-term storage

MrSID (high compression)

Web visualization

MrSID or Cloud formats

Analysis-heavy work

Lossless GeoTIFF or low compression MrSID


  1. Avoid Repeated Compression


Recompressing already compressed images degrades quality


A compressed image is more than just a smaller file—it’s a key component of modern digital optimization. From improving website performance to enabling efficient UAV data processing, compression techniques help strike the perfect balance between quality and efficiency.


For more information or any questions regarding the compressed image, please don't hesitate to contact us at:


Email:


USA (HQ): (720) 702–4849




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