GIF Format and OCR: Working with 256-Color Images
GIF (Graphics Interchange Format) uses LZW compression with a maximum palette of 256 colors. This limited palette makes GIF unsuitable for photographic content but effective for text-on-solid-color graphics, diagrams, and simple UI screenshots.
For OCR purposes, GIF's 256-color limit creates distinct character boundaries when text uses a limited color palette. Black text on a white background in GIF format produces sharp, artifact-free edges that achieve 95-99% OCR accuracy.
Animated GIF Processing
- Frame Extraction: The converter extracts the first frame of animated GIFs for OCR. This frame typically contains the complete text content.
- Color Dithering: Photographic GIFs use dithering to simulate colors beyond the 256-color limit. Dithering creates dot patterns that interfere with OCR — avoid converting dithered GIFs.
- Transparent GIFs: GIF transparency designates one palette color as transparent. This color is composited onto white before OCR processing.