Image File Formats

properties

ID: 589b5025-b95f-4271-806b-e6960c4fb0a0
CREATED: <2025-05-05 Mon 18:16>

edges

[2025-05-05 Mon 18:17] – wiki
[2025-07-18 Fri 23:31] – spec
[2025-10-16 Thu 18:33] <- DEFLATE

Portable Network Graphics, developed as an improvement to GIF.

properties

ID: 9fbe4894-4557-46c4-b602-99823bd2ea66
CREATED: <2025-05-05 Mon 18:17>

edges

[2025-05-05 Mon 18:18] – wiki
[2025-07-18 Fri 23:32] – spec
[2025-10-16 Thu 18:32] <- DEFLATE

• basically repeated image captures with LZW compression

properties

ID: ee2a3b64-3a16-4056-a6b4-2514495f7ccb
CREATED: <2025-07-18 Fri 23:38>
AKA: JPG

edges

[2025-07-18 Fri 23:39] – JPEG - JPEG 1
[2025-07-18 Fri 23:39] – The JPEG standard (ISO/IEC 10918-1)
[2025-07-18 Fri 23:46] <- libjpeg-turbo

• JPEG = Joint Photographic Experts Group
• complicated enough to merit using FFI (imo) - see libjpeg-turbo
• Developed in 1992 by the ISO
• True color (up to 24 bits/pixel) and grayscale (up to 8 bits/pixel) images
• Eligible compression quality between
• Visually lossless reconstructions of color images for compression ratios about bits/pixel (bpp)
• Based on the Discrete Cosine Transform (DCT)
• Several working modes: lossy, lossless and hierarchical