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Image File Formats

Image File Formats. Some Common Image Formats. JPG – Used for most digital photos but “ lossy ” GIF – Best for line drawings. 256 colors maximum. No loss BMP – Bitmap. Every pixel stored individually TIF – Standard in many technical applications. No loss PNG – Lossless image format

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Image File Formats

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  1. Image File Formats

  2. Some Common Image Formats • JPG – Used for most digital photos but “lossy” • GIF – Best for line drawings. 256 colors maximum. No loss • BMP – Bitmap. Every pixel stored individually • TIF – Standard in many technical applications. No loss • PNG – Lossless image format • RAW – Data as captured by digital camera

  3. Test Image (640 x 479 pixels)

  4. Test Image in Various Formats • JPG 67 kb • GIF 185 kb (256 colors, optimized) • BMP 899 kb (640*479*3/1024 = 898.125) • TIF 902 kb • PNG 418 kb • RAW 900 kb

  5. GIF Test Image

  6. GIF Versus JPG • GIF: 11 kb JPG: 78 kb

  7. GIF Versus JPG • For photographic images JPG is better both for quality and file size • For line art GIF is better both for quality and file size • The future of line art is probably in vector file formats like SVG (Scalable Vector Graphics) • VML (Vector Markup Language) is Microsoft backed

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