Conversion descriptions

How unit conversions are calculated and how to convert files in the terminal: formulas, packages, commands, and Dockerfiles.

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HEIC to JPEG via CLI

Convert iPhone HEIC/HEIF photos to JPEG with heif-convert.

AVIF to JPEG via CLI

Decode an AVIF still with ffmpeg and write a JPEG.

dcraw + pnmtojpeg

CR2 to JPEG via CLI

Develop Canon RAW with dcraw, then encode JPEG with pnmtojpeg.

JPEG to PNG via CLI

Re-encode JPEG as PNG with ffmpeg.

PNG to JPEG via CLI

Convert PNG to JPEG with ffmpeg and a quality setting.

JPEG to WebP via CLI

Encode JPEG as WebP with cwebp at quality 90.

PNG to WebP via CLI

Convert PNG to WebP with cwebp — lossy or lossless.

WebP to PNG via CLI

Decode WebP to PNG with dwebp, keeping transparency.

WebP to JPEG via CLI

Two steps: dwebp decodes WebP to PNG, ffmpeg encodes JPEG.

Compress JPEG via CLI

Lossless: jpegtran optimizes Huffman tables and strips EXIF.

Compress PNG via CLI

Lossless PNG compression with optipng and metadata stripping.

Crop image via CLI

ffmpeg: crop a still image to width×height at x,y.

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